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Tytuł:
Energy efficiency of ground heat exchangers co-operating with a compressor heat pump
Efektywnosc energetyczna wymiennikow gruntowych wspolpracujacych ze sprezarkowa pompa ciepla
Autorzy:
Kurpaska, S.
Latala, H.
Powiązania:
https://bibliotekanauki.pl/articles/792483.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
compressor heat pump
heat exchanger
horizontal exchanger
vertical exchanger
ground heat exchanger
coefficient performance
statistical analysis
energy efficiency
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 2
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of Different Heat Exchangers and the Thermal Activities of Different Designs
Autorzy:
Ipek, O.
Kan, M.
Gurel, B.
Powiązania:
https://bibliotekanauki.pl/articles/1031281.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
heat exchangers
compact heat exchanger
micro channel heat exchanger
Opis:
In this study, instead of gasketed or brazed plate heat exchangers, which are used in various fields of application, a direct metal sintering method is used to design a heat exchanger with its original geometry and with different geometries. Studies of heat exchangers found in published literature were reviewed, and the thermal behaviors of the proposed unique designs were examined. Usually heat exchangers using this design do not use channel spacing angles of 30-45-60-75° for the plate ducts. The thermal behaviors of the fluid-circulating systems were analyzed using ANSYS FLUENT software, and they used the boundary conditions found in the literature for this design. Heat transfer between the heat exchanger channels and channel walls was calculated. The analyses results show that an increase in the amount of heat transfer surface area and also an increase in surface roughness increased the amount of positive heat transfer.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 580-584
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy efficiency of ground heat exchangers co-operating with a compressor heat pump
Efektywnosc energetyczna wymiennikow gruntowych wspolpracujacych ze sprezarkowa pompa ciepla
Autorzy:
Kurpaska, S.
Latala, H.
Powiązania:
https://bibliotekanauki.pl/articles/793577.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
heat pump
compressor heat pump
heat exchanger
horizontal exchanger
vertical exchanger
coefficient performance
statistical analysis
variance analysis
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on efficiency of heat recovery in the cross-plate heat exchanger made of plastic
Autorzy:
Sas, S.
Kasprzyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/88926.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
heat exchanger
heat recovery
Opis:
The article content the results of study of heat exchanger. Exchanger was made of plastic material: polystyrene. The measurement results were used for efficiency analysis of this type of heat exchanger as an alternative to the commonly used heat exchangers made of aluminum.
Źródło:
Mining Science; 2015, 22, Special Issue 2; 151-159
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of a new recuperative Heat and Moisture Exchange Mask
Autorzy:
Wehrle, Mario P.
Küpper, Thomas
Muth, Claus-M.
Powiązania:
https://bibliotekanauki.pl/articles/2098225.pdf
Data publikacji:
2021-03-05
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:
heat exchanger mask
cold weather mask
heat and moisture exchanger mask
recuperative HME
Opis:
Aim of the study: The purpose of this work is to show the possibility to use a recuperative design of a heat and moisture exchange face mask (HME). Such HME are used as cold weather face masks for Arctic expeditions and conditioning of air for long-term intubated patients. Common regenerative HME have the disadvantage of increasing airway resistance and airway volume (dead space). In recuperative devices, the separation of inspired and expired airflow could reduce dead space and resistance. Materials and methods: Prototype HMEs were built using two concentric ducts of aluminium or cotton. A valve ensures that expired and inspired air are led through either the inner or the outer tube. The inner tube’s wall transmits heat and water. The HMEs were tested in a simulated Arctic environment using a breathing simulator and characterized in terms of heat and moisture exchange efficiency. The new design was also tested at room temperature in order to simulate the conditions of long-term intubation. To compare the results, the relative difference in temperature (Performance Coefficient PC) between the expired and the inspired air was calculated. Results: During the experiments, the ambient temperature was −37°C and therefore the absolute water content was about zero. The recuperative HME conditioned the air to 21°C and 10.7 mg/l water (61% relative humidity), giving a PC of 82%. At room temperature the recuperative mask showed a PC of 62%.Conclusion: The recuperative HME shows great potential. It might be of use in clinical conditions and Arctic expeditions.
Źródło:
Health Promotion & Physical Activity; 2021, 14, 1; 9-16
2544-9117
Pojawia się w:
Health Promotion & Physical Activity
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sunset Yellow sorption on weak base anion exchanger — kinetic and equilibrium studies
Autorzy:
Wawrzkiewicz, M.
Wołowicz, A.
Greluk, M.
Hubicki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/115804.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
dye
anion exchanger
adsorption
kinetics
Opis:
The sorption equilibrium and kinetics of Sunset Yellow dye in aqueous solutions on the weak base anion exchange resin — Amberlite FPA51 were examined in this paper. The influences of phase contact time, solution pH, initial dye concentration and temperature were studied by the batch method. The amounts of dye sorbed at equilibrium changed from 9.9 to 48.7 mg/g with the increasing initial concentrations in the range 100–500 mg/L. The experimental data were analyzed by the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models of adsorption. The maximum monolayer capacity was 130.6 mg/g. The sorption free energy was equal to 14.6 kJ/mol and revealed the nature of the ion exchange mechanism in this system. The kinetic data were modelled using the pseudo-first order, pseudo-second order and intraparticle diffusion equations.
Źródło:
Challenges of Modern Technology; 2011, 2, 2; 66-70
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of a Large Rotary Heat Exchanger
Autorzy:
Tulwin, T.
Powiązania:
https://bibliotekanauki.pl/articles/118115.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
CFD
Conjugate
Heat
Exchanger
Recuperation
Opis:
The first simulation consists of a partial cut-out of gas flow canal between the heat exchanger fins. The simulation is steady state and mainly provides the information about the heat transfer coefficient and pressure drop across the canal. The second simulation takes into account the complete system of rotary heat exchanger. It is a transient simulation with moving mesh. Then the heat transfer and air flow parameters are presented as a porous volume with a heat transfer model and rotational multi zone interface conditions. This simplification is accurate providing much better performance as the number of mesh nodes is much smaller. The methodology of the model setup is presented.
Źródło:
Applied Computer Science; 2017, 13, 1; 20-28
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Joint Operation of a Ground Soil Heat Exchanger and a Thermal Pump Evaporator
Autorzy:
Sydorchuk, Bogdan
Naumchuk, Oleksandr
Mazurek, Paweł A.
Powiązania:
https://bibliotekanauki.pl/articles/1839101.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
ground heat exchanger
thermal pump
Opis:
The development of civilization is associated with an increase in demand for energy. Nowadays, the technologies using renewable energy sources are particularly important. The heating systems powered by heat pumps are increasingly used. The article presents an integrated mathematical model that takes into account the joint operation of the ground heat exchanger and the internal circuit of the heat pump. Modeling was done in Matlab environment. The modeling results allow optimizing the evaporator design in order to effectively use the heat pump.
Źródło:
Journal of Ecological Engineering; 2021, 22, 2; 256-261
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of weakly basic anion exchanger for removal of Remazol Black B
Autorzy:
Greluk, M.
Hubicki, Z.
Wawrzkiewicz, M.
Wołowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/115782.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
Remazol Black B
anion exchanger
sorption
Opis:
The weakly basic anion exchangers of the functional tertiary amine gropus with the polystyrene skeleton: Amberlyst A-21 and with acrylic skeleton: Amberlite IRA-67 were investigated as adsorbents of Remazol Black B from aqueous solutions. Experiments were carried out as function of contact time (1–240 min.), initial dye concentration (50–500 mg/dm3), pH (1–12), temperature (298–318 K) and ionic strength (NaCl). The results indicate that the investigated anion exhchangers are suitab;e as adsorbent material of Remazol Black B from aqueous solutions
Źródło:
Challenges of Modern Technology; 2011, 2, 3; 29-33
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal energy storage in ceresine-based accumulative heat exchanger
Autorzy:
Borcuch, M.
Musiał, M.
Wójcik, T.
Powiązania:
https://bibliotekanauki.pl/articles/175462.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy storage
PCM
accumulative heat exchanger
Opis:
The paper contains description of conception, realization a tests of an accumulative heat exchanger. The appliance has a sectional construction with four cassettes filled with ceresine – a mixture of paraffins. The exchanger is dedicated for ventilation and cooling applications, especially in passive buildings. Usage of phase change materials is one of the most important topics in the whole area of energy storage. Series of tests have been done, during which both, the casing and the cover have been insulated, thereby thermal losses have been limited. Furthermore, paper presents an influence of insulation on the heat storage possibility in the proposed accumulative heat exchanger.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 128; 19-27
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novye shemy i osobennosti rabocego processa gazoturbinnyh dvigatelej na baze kaskadnogo obmennika davleniem
New patterns and peculiarities of the gas turbine working process on the base of cascade pressure exchanger
Autorzy:
Krajniuk, A.
Klyus, O.
Powiązania:
https://bibliotekanauki.pl/articles/359115.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cascade pressure exchanger
gas turbine
heat exchanger
energy exchange
cascade exchange
circuit’s maximum temperature
Opis:
The paper describes the main directions of gas turbines improvement in terms of application of the cascade pressure exchange rules for air compression in the machine�fs working cycle. The final calculation results of the four variants of the working process organization on the base of the two-stage gas turbine compression unit with inter-cooling and heating of the gas medium are presented. Opportunities and provision of energy efficiency increase of cascade pressure exchange gas turbine by increasing the maximum temperature of the circulation and recirculation of waste heat gas compression are shown.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 1; 17-25
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motematiceskaa model rabocego processa vozdusnoi holodilnoi masiny kaskadnogo obmena davleniem refriseratornyh sekcij morskogo transporta
Mathematical model of the working process of cascade pressure exchange air cooling machine of refrigeration section in maritime transport
Autorzy:
Krajniuk, A.
Klyus, O.
Powiązania:
https://bibliotekanauki.pl/articles/359118.pdf
Data publikacji:
2012
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
cascade pressure exchanger
gas turbine
heat exchanger
energy exchange
cascade exchange
circuit’s maximum temperature
Opis:
The article presents a mathematical model for determining the base regimes for common work of air cooling machine’s units with cascade pressure exchanger which allows to specify the device performance and thermal energy expenses. The final results of modeling and recommendations for the area of application are described.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 1; 12-16
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O sposobah utilizacii tepla na ekspluatacionnyh rezimah cydovyh i stacionarnyh energeticeskih ustanovok
Heat Utilization Methods for the Operation of Marine and Industrial Power Plants
Autorzy:
Kantalinskij, V.
Patrakeeva, E.
Powiązania:
https://bibliotekanauki.pl/articles/359871.pdf
Data publikacji:
2004
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
EXPLO-SHIP 2004
marine power plants
industrial power plants
heat utilization
saved heat exchanger
condensation exchanger
Opis:
The article discusses the results of using waste gas heat from heat power plant boilers. The authors suggest working out rational schemes adaptation for heat-surfaces staying in boiler's air-gas path. There is showed principle possibility of condensation and low-temperature save heat exchangers use on ship power plants.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 1 (73); 279-289
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of the steam flow field in shell and tube heat exchanger
Autorzy:
Bartoszewicz, J.
Bogusławski, L.
Powiązania:
https://bibliotekanauki.pl/articles/240429.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer
heat exchanger
shell and tube heat exchanger
przenikanie ciepła
wymiennik ciepła
wymiennik płaszczowo-rurowy
Opis:
In the paper, the results of numerical simulations of the steam flow in a shell and tube heat exchanger are presented. The efficiency of different models of turbulence was tested. In numerical calculations the following turbulence models were used: k-ε, RNG k-ε, Wilcox k-ω, Chen-Kim k-ε, and Lam-Bremhorst k-ε. Numerical analysis of the steam flow was carried out assuming that the flow at the inlet section of the heat exchanger were divided into three parts. The angle of steam flow at inlet section was determined individually in order to obtain the best configuration of entry vanes and hence improve the heat exchanger construction. Results of numerical studies were verified experimentally for a real heat exchanger. The modification of the inlet flow direction according to theoretical considerations causes the increase of thermal power of a heat exchanger of about 14%.
Źródło:
Archives of Thermodynamics; 2016, 37, 2; 107-120
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Involvement of Na+/H+ exchanger in desmopressin-induced platelet procoagulant response.
Autorzy:
Tomasiak, Maria
Stelmach, Halina
Bodzenta-Łukaszyk, Anna
Tomasiak, Marian
Powiązania:
https://bibliotekanauki.pl/articles/1041558.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Na+/H+ exchanger
platelets
desmopressin
procoagulant activity
Opis:
Desmopressin (DDAVP) action on platelets is associated with the development of procoagulant response but the underlying mechanism of this phenomenon is not known. We investigated whether this effect of DDAVP might be due to activation of plasma membrane Na+/H+ exchanger. The DDAVP-induced platelet procoagulant response, measured as phospholipid-dependent thrombin generation, was dose dependent and significantly weaker than that produced by collagen or monensin (mimics Na+/H+ antiport). Both the DDAVP- and collagen-produced procoagulant responses were less pronounced in the presence of EIPA, an Na+/H+ exchanger inhibitor. Flow cytometry studies revealed that in vitro treatment of platelets with DDAVP or collagen was associated with the appearance of both degranulated (and fragmented) and swollen cells. The DDAVP-evoked rise in size and granularity heterogeneity was similar to that produced by collagen or monensin and was not observed in the presence of EIPA. Using flow cytometry and annexin V-FITC as a probe for phosphatidylserine (PS) we demonstrated increased and uniform binding of this marker to all subsets of DDAVP-treated platelet population. The DDAVP-evoked PS expression was dose dependent, strongly reduced by EIPA and weaker than that caused by monensin or collagen. As judged by optical swelling assay, DDAVP in a dose dependent manner produced a rise in platelet volume. The swelling was inhibited by EIPA and its kinetics was similar to that observed in the presence of monensin. Electronic cell-sizing measurements showed an increase in mean platelet volume and a decrease in platelet count and platelet crit upon treatment with DDAVP. DDAVP elicited a slow (much slower than collagen) alkalinization of platelet cytosol. Altogether the data indicate an involvement of Na+/H+ exchanger in the generation of procoagulant activity in DDAVP-treated platelets.
Źródło:
Acta Biochimica Polonica; 2004, 51, 3; 773-788
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of crystalline glucose from the last green syrup (so called hydrol)
Odzyskiwanie krystalicznej glukozy z ostatniego odcieku tzw. hydrolu
Autorzy:
Nebesny, E.
Sroczyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399007.pdf
Data publikacji:
1987
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
improvement of hydro!
glucose
glucoamylase ion exchanger
Opis:
Hydrol was refined and saccharified enzymatically, following which its glucose was crystallized directly or in a mixture with starch hydrolysate.
W przeprowadzonych doświadczeniach, ostatni odciek po krystalizacji glukozy tzw. hydrol o wartości 64 DE, stanowiący produkt uboczny hydrolizy skrobi metodą kwas-enzym poddawano rafinacji wymieniaczami jonowymi (kationitem i anionitem) oraz żywicą adsorpcyjną w celu usunięcia zanieczyszczeń mineralnych i organicznych (tab. 1), w tym głównie białka surowego. Następnie oczyszczony hydrol scukrzono glukoamylazą (0,25%s. s.) w temp. 60°C przy pH 4,5 w ciągu kilku dni (tab. 2). Jednocześnie scukrzano glukoamylazą hydrolizat skrobi o ok. 22 DE po wstępnej kwasowej hydrolizie i mieszaninę hydrolu rafinowanego i hydrolizatu w stosunku 1: 4. Uzyskano znaczne scukrzenie hydrolu rafinowanego do wartości 86 DE, równającej się redukcyjności soku glukozowego produktu II. Scukrzanie glukoamylazą mieszaniny hydrolu i hydrolizatu pozwoliło osiągnąć redukcyjność 92,8 DE zbliżoną do wartości 94,4 DE soku glukozowego produktu I (samego hydrolizatu). Przeprowadzona analiza składu węglowodanowego hydrolu surowego i hydrolu rafinowanego po jego scukrzeniu glukoamylazą pozwoliła stwierdzić podwyższenie prawie 1,5-krotne zawartości glukozy i obniżenie do około połowy zawartości izomaltozy i izomaltotriozy w s. s. hydrolu oraz praktycznie zanik pozostałych oligosacharydów rj. maltozy i jej wyższych homologów. Po zagęszczeniu wymienionych roztworów, scukrzonych glukoamylazą, do ok. 72 Bx i zaszczepieniu ich 1,25% monohydratu glukozy krystalicznej, przeprowadzono w ciągu 2-4 dni w temperaturze stopniowo obniżanej z 44°C krystalizację w nich glukozy. W wyniku tego procesu uzyskano 36,2% glukozy krystalicznej (w przeliczeniu na bezwodną) z hydrolu rafinowanego scukrzonego a nawet 42,4% wykrystalizowanej glukozy z mieszaniny hydrolu i hydrolizatu skrobi (1 : 4) to jest ilość zbliżoną do glukozy wykrystalizowanej z czystego hydrolizatu skrobi- 44,1%, co jest dobrym rezultatem. Powyższe wyniki mają istotne znaczenie z uwagi na kilkakrotnie wyższą cenę glukozy krystalicznej niż glukozy zawartej w hydrolu.
Źródło:
Acta Alimentaria Polonica; 1987, 13, 4; 342-349
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of energy transfer between pipes of U-type borehole heat exchanger
Autorzy:
Złotkowski, A.
Druzgała, A.
Zeljaś, D.
Powiązania:
https://bibliotekanauki.pl/articles/298765.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
heat pumps
borehole heat exchanger
heat flux
Opis:
Use of low-temperature energy accumulated in the ground for heating buildings requires the borehole heat exchangers. The amount of heat exchanged (by the heat exchanger with the urethane) depends on the construction material parameters used to make the exchanger. One of the problems with the efficiency of the heat exchanger is the amount of heat transferred between the borehole pipes. This phenomenon can be described using numerical simulations or by studying a laboratory model. This article shows the results of laboratory measurements of the heat flux permeating between the pipes of the heat exchanger.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 4; 843-853
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the effect of medium flow parameters on heat transfer in the laboratory coaxial model of a borehole heat exchanger
Autorzy:
Śliwa, T.
Gałuszka, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/298858.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
borehole heat exchanger (BHE)
geoenergetics
flow character
Opis:
Reynolds number defines the fluid flow character. Three types of flow are distinguished: laminar, transitional and turbulent flows. By changing the flow conditions in the coaxial vertical borehole heat exchanger, a research was carried on energy (heat) exchange. The authors analyzed the flow of fluids through a model of concentric vertical heat exchanger in the Laboratory of Geoenergetics in AGH University of Science and Technology, Faculty of Drilling, Oil and Gas. Measurements for different materials and dimensions of internal column were performed.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 4; 421-431
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Honeycomb compact heat exchanger for compressor interstage cooling
Autorzy:
Michalak, B.
Domański, R.
Powiązania:
https://bibliotekanauki.pl/articles/242261.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
compact heat exchanger
intercooler
interstage cooling
heat
Opis:
The paper presents results of numerical fmite volume analysis of an efficiency of honeycomb compact gas to gas heat exchanger usedfor compressor interstage cooling for aircraft jet engine. The main analysis starts with building geometry followed by the problem description and model discretization leading to the flnal results and summary. Eight cases were created for the basic model and also several more for afinned geometry. The parallel and counter-current flow modes were considered Special emphasis was laid on finding the heat transfer rate, LMTD parameter and temperature distribution. It was found out that a honeycomb structure is almost insensitive for flow arrangement change and that afinned structure assures much higher heat transfer rate. The honeycomb structure is almost insensitive for flow arrangement change while the finned structure turned out to provide a much better heat transfer. The structure is also almost insensitive for a more efficient (i. e. parabolic) fin shape could also increase the heat transfer in the required area. A more accurate mesh should be created to analyse the finned structure and get more reliable results. The honeycomb structure provides apossibility to create the heat transfer process between more then two fluids i. e. three or four.
Źródło:
Journal of KONES; 2009, 16, 2; 315-321
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multifunctional Coagulants Based on Hidrocarboaluminates Calcium
Autorzy:
Sizyakova, E. V.
Ivanov, P. V.
Powiązania:
https://bibliotekanauki.pl/articles/124466.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
hidrocarboaluminates calcium
water treatment
coagulant
ion exchanger
Opis:
The article describes harmful factors from the environmental point of view that accompany almost all stages of the production of non-ferrous metals. Due to the fact that this industry requires large volume of water, these factors require special attention when cleaning wastewater. The contamination of wastewater by non-ferrous metallurgy is characterized by metal ions, particulate pollutants, acids, SAS, etc. A common feature of all these substances is harmfulness, however, they are often very aggressive and toxic. The article focuses on the possible use of hidrocarboaluminates calcium as an active ion exchanger for cleanup wastewater metallurgical production.
Źródło:
Journal of Ecological Engineering; 2017, 18, 2; 16-20
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal performance evaluation of an earth-to-air heat exchanger for the heating mode applications using an experimental test rig
Autorzy:
Ahmad, Saif Nawaz
Prakash, Om
Powiązania:
https://bibliotekanauki.pl/articles/2091363.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer
earth-to-air heat exchanger
ground heat exchanger
geothermal energy
renewable energy
assive heating
assive cooling
effectiveness
Opis:
This paper presents the experimental investigation of an earth-to-air heat exchanger for heating purposes in the Patna region of India, using an experimental test rig. In the view of the author, real field experiments have several limitations such as lack of repeatability and uncontrolled conditions. It also takes more time for the response of parameters that depends on nature and climate. Moreover, earth-to-air heat exchangers may be expensive to fabricate and require more land area. Thus, in this work authors executed their experimental work in indoor controllable environments to investigate the thermal performance of an earth-to-air heat exchanger. The actual soil conditions were created and maintained the temperature at 26°C throughout the soil in the vicinity of pipes. Three horizontal PVC pipes of equal lengths and diameters of 0.0285 m, 0.038 m and 0.0485 m were installed in the test rig. The experiments were performed for different inlet air velocities at ambient air temperature. This study acknowledges that the maximum rise in outlet temperature occurs at a lower speed for smaller pipes. Also, the maximum effectiveness of 0.83 was observed at 2 m/s for the smallest diameter pipe.
Źródło:
Archives of Thermodynamics; 2022, 43, 1; 185--207
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected Cyclic Corrosion Tests in Automotive Industry
Autorzy:
Biało, Ł.
Grodniewicz, T.
Żabiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/354042.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
corrosion test
automotive
aluminum
heat exchanger
corrosion products
Opis:
Corrosion is a main problem for longtime exploration of heat exchangers in automotive industry. Proper selection of accelerated corrosion test for newly developed material is a key aspect for aluminum industry. The selection of material based on corrosion test includes test duration, chemical spray composition, temperature and number of cycles. The paper present comparison of old and newly developed accelerated corrosion tests for testing automotive heat exchanger. The accelerated test results are comprised with heat exchanger taken from market after life cycle.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1469-1476
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eco-innovative method of cleaning heat exchangers from boiler scale
Autorzy:
Olczak, Piotr
Kowalski, Zygmunt
Kulczycka, Joanna
Makara, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/406832.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat exchanger
chemical treatment method
eco-innovative
boiler
Opis:
The operation of thermal devices and installations, in particular heat exchangers, is associated with the formation of various deposits of sediments, forming the boiler scale. The amount of precipitate depends on the quality of the flowing liquids treatment, as well as the intensity of the use of devices. There are both mechanical and chemical treatment methods to remove these deposits. The chemical methods of boiler scale treatment include the cleaning method consisting in dissolving boiler scale inside heat devices. Worked out descaling concentrate contains phosphoric acid (V) and the components that inhibit corrosion, anti-foam substances, as well as anti-microbial substances as formalin, ammonium chloride, copper sulphate and zinc sulfate. Dissolution of the boiler scale results in the formation of wastewater which can be totally utilized as raw materials in phosphoric fertilizer production. As a result, both the preparation produced and its use are entirely free from waste.
Źródło:
Management and Production Engineering Review; 2020, 11, 1; 23--30
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ventilation system with ground heat exchanger
Autorzy:
Pisarev, V.
Rabczak, S.
Nowak, K.
Powiązania:
https://bibliotekanauki.pl/articles/123849.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
ground heat exchanger
ventilation
heat pump
heat source
Opis:
Ventilation systems consume more and more energy because of the often complex treatment of the air supplied to closed spaces. Looking for sources of energy allow for significant savings costs, which often translate into renewable energy sources. One of the more popular solutions is to use energy from the ground by various methods. Known and relatively common solutions are based on ground heat exchanger and ground collector cooperating with a heat pump. The paper presents the possibility of cooperation ventilation system with ground air heat exchanger and heat pump both in summer and winter period. A number solutions of this type of system, supported by calculation examples and moist air transformation in the Moliere chart have been presented. Support ventilation system with renewable energy sources allows significant savings in operating as shown in the article.
Źródło:
Journal of Ecological Engineering; 2016, 17, 5; 163-172
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of hydraulic characteristic for borehole heat exchangers
Autorzy:
Śliwa, T.
Jaszczur, M.
Kruszewski, M.
Sapińska-Śliwa, A.
Bieda, A.
Kowalski, T.
Złotkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/298988.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
thermal response test
borehole heat exchanger
hydraulic characterization
Opis:
Thermal Response Test (TRT) is a standard test performed in borehole heat exchangers (BHE), which provides thorough understanding of thermal parameters of surrounding rock mass. Following work consists of calculations for hydraulic power and pressure losses along the BHE’s length. Analysis was carried out in eight BHE’s with different diameters, lengths and heat carriers in various areas throughout Poland. In accordance with TRT results, potential power exchanged between BHE and rock mass was determined. In order to find relations between pressure losses and volumetric flow rate, hydraulic tests in average static temperature of rock mass and during heating period were investigated. Proportions between hydraulic power and total power exchange with rock mass are also presented in following research.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 1; 123-139
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Wastewater Containing a Mixture of Heavy Metal Ions (Copper-Zinc, Copper-Nickel) using Ion-Exchange Methods
Autorzy:
Koliehova, Anastasiia
Trokhymenko, Hanna
Melnychuk, Svitlana
Gomelya, Mykola
Powiązania:
https://bibliotekanauki.pl/articles/125436.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heavy metals
ion exchange
regeneration
cation exchanger
sorption
Opis:
The main aim of the scientific research was to study the ion-exchange processes in the treatment of industrial wastewaters containing a high concentration of heavy metal ions (Cu2+, Zn2+, Ni2+). The sorption results of heavy metal mixtures (Cu-Zn, Cu-Ni) from model solutions of sulfate salts on a strong-acid KU-2–8 cation exchanger in the H+-form were presented. The metals concentration was 10–50 meq/dm3. The efficiency conditions of cation regeneration in Cu2+-Zn2+, Cu2+-Ni2+-forms by 5, 8 and 10 % sulfuric acid solutions were studied. It was shown that the heavy metals from aqueous media can be removed not only from ion exchangers, but can also be restored from regenerative solutions by electrolysis to obtain metals in pure form. In general, the research results showed that the use of ion exchange is very effective in removing the heavy metal ions. The sorption efficiency and regeneration efficiency was about 100%.
Źródło:
Journal of Ecological Engineering; 2019, 20, 11; 146-151
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Fin Shape on Heat Transfer in Coil and Fin type Evaporator
Autorzy:
Prokopowicz, Mateusz
Grzebielec, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/24202385.pdf
Data publikacji:
2021
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
evaporator
fins
heat exchanger
parownik
żebra
wymiennik ciepła
Opis:
The aim of the study is to investigate the influence of external fins on heat transfer in the evaporator. The scope in which the analysis was performed is to check how the capacity of the exchanger is affected by the change of individual elements of the fin geometry. The introduction describes the current state of knowledge about evaporators. One of the subchapters is entirely devoted to the phenomenon of frosting evaporators, which is unfavourable from the point of view of heat transfer. The subsection also describes how to minimize the occurrence of this phenomenon. The next chapter presents mathematical models of heat transfer coefficients during boiling of inorganic refrigerants in horizontal pipes and during the flow of a bundle of smooth and air-fined pipes. On the basis of correlations and mathematical dependencies contained in this chapter, analyses of the influence of individual factors on heat transfer in the evaporator were performed. The next chapter contains the analysis methodology, it contains drawings of modeled heat exchangers. The penultimate chapter contains the results of the analyses with graphs and descriptions, detailing the most important differences between the individual evaporator geometries. The last chapter is a summary and conclusions about the effect of fins on heat transfer in the evaporator.
Źródło:
Modern Engineering; 2021, 4; 1--12
2450-5501
Pojawia się w:
Modern Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efektywność pracy pompy ciepła współpracującej z wymiennikami gruntowymi
Effectiveness of heat pump working with ground heat exchangers
Autorzy:
Kurpaska, S.
Latała, H.
Powiązania:
https://bibliotekanauki.pl/articles/290666.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
pompa ciepła
efektywność
pionowy wymiennik gruntowy
poziomy wymiennik gruntowy
heat pump
effectiveness
vertical ground heat exchanger
horizontal ground heat exchanger
Opis:
W pracy przedstawiono wyniki badań nad efektywnością pompy ciepła współpracującej z dolnym źródłem ciepła w postaci pionowych i poziomych gruntowych wymienników ciepła. Określono wpływ długości cyklu i długości pracy pompy ciepła w procesie ładowania energią zbiornika buforowego na przebieg średnich wartości współczynnika efektywności. Określono również statystyczną istotność tych zależności.
The work shows results of research on effectiveness of heat pump working with lower heat sources in form of vertical and horizontal ground heat exchangers. The research allowed to determine the influence of cycle length and heat pump work durationin the process of charging the buffer tank with energy on average values of the effectiveness coefficient trajectory. Statistic relevance of these correlations was determined as well.
Źródło:
Inżynieria Rolnicza; 2008, R. 12, nr 6(104), 6(104); 105-112
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of the impact of construction solutions on operating parameters of the internal heat exchanger with refrigerant R744
Autorzy:
Janus, Jakub
Skotniczy, Przemysław Jan
Richert, Maria
Powiązania:
https://bibliotekanauki.pl/articles/240370.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat exchanger
internal heat exchanger
cooling efficiency
numerical fluid mechanics
wymiennik ciepła
wewnętrzny wymiennik ciepła
efektywność chłodzenia
numeryczna mechanika płynów
Opis:
Work on increasing the efficiency of heat exchangers used in car air conditioning systems may lead to a partial change in the construction of refrigeration systems. One of such changes is the use of smaller gas coolers, which directly translates into a reduction in the production costs of the entire system. The article presents the use of computational fluid dynamics methods to simulate the impact of changing the shape of an internal heat exchanger on the cooling efficiency with R744 as the refrigerant. Internal heat exchangers with different geometry of the outer channels were subjected to numerical analysis. The obtained results of calculations show temperature changes in inner and outer channels on the length of the heat exchanger.
Źródło:
Archives of Thermodynamics; 2019, 40, 1; 145-160
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency of the heat pump cooperating with various heat sources in monovalent and bivalent systems
Efektywnosc pompy ciepla wspolpracujacej z dolnymi zrodlami ciepla w systemie mono i biwalentnym
Autorzy:
Kurpaska, S.
Latala, H.
Lapczynska-Kordon, B.
Mudryk, K.
Powiązania:
https://bibliotekanauki.pl/articles/792536.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
heat pump
heat source
heat distribution
monovalent system
bivalent system
compressor heat pump
vertical exchanger
horizontal exchanger
coefficient performance
heating system
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of heating output evaluation methods for borehole heat exchangers
Autorzy:
Śliwa, T.
Grygieńcza, A.
Bieda, A.
Sapińska-Śliwa, A.
Gonet, A.
Jaszczur, M.
Kowalski, T.
Powiązania:
https://bibliotekanauki.pl/articles/299135.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
borehole heat exchanger
geoenergetics
heat pumps
thermal response test
Opis:
Projects involving borehole heat exchangers more often need to undergo a series of tests before implementation. Inserted pipes and cement in the borehole may have diff erent thermal properties. Until recently, such values were determined in approximate, based on values taken from the literature. Special methods are used more often to perform this type of work in order to correctly determine the properties of a borehole heat exchanger. The aim of the study was to present an analysis of thermal properties of borehole heat exchangers with the main emphasis on parameters such as thermal conductivity and thermal resistance. The analyzed data was obtained through the use of three methods:– analysis of the lithological profi le with rock conductivity based on the literature,– analysis of natural temperature profi le in aborehole heat exchanger (logger NIMO-T),– thermal response test.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 3; 579-594
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An advanced thermal-FSI approach of an evaporation of air heat pump
Autorzy:
Felicjancik, J.
Ziółkowski, P.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/175437.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CFD modeling
evaporator
fin-tube heat exchanger
heat transfer
Opis:
The paper presents selected problems of numerical modelling of an advanced thermal- FSI (Fluid solid interaction) approach of evaporator of air heat pump. The example of a fin-tube evaporator has been studied, focusing on obtaining the heat exchanger characteristics applying two-phase flow model for the in-tube refrigerant flow. Special attention is given to heat transfer between separated medium for different air velocity and changed refrigerant mass flow in-tube.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 111-141
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulations of temperature and velocity fields in the storage tank with the three-coil heat exchanger
Autorzy:
Smusz, Robert
Wilk, Joanna
Bałon, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/176025.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stratification device
numerical calculations
temperature stratification
coil heat exchanger
Opis:
This article presents the results of the numerical investigation of the thermal stratification in the hot water storage tank. The exchanger consists of three tube coils that are immersed in the storage tank of hot water. Two coils—lower and upper—are designed to warm the water in the tank using the water as a heating medium. Another coil—uses the refrigerant for the waste heat transfer. The temperature stratification device is mounted in the thermal storage tank. The device’s task is to improve the thermal stratification level of heated water. The performed numerical simulations allowed us to obtain the temperature and velocity fields in the storage tank under the conditions of the work of coils filled with water. Calculations were made in the case of the use of the stratification device under the operating conditions of the 10.2478/amst-2019-0015upper and lower coils with water.
Źródło:
Advances in Manufacturing Science and Technology; 2020, 44, 3; 74-79
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical model and measurements of a combi-steamer condensation hood
Autorzy:
Tokarski, Mieszko
Ryfa, Arkadiusz
Buliński, Piotr
Rojczyk, Marek
Ziarko, Krzysztof
Nowak, Andrzej J.
Powiązania:
https://bibliotekanauki.pl/articles/240444.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy balance
heat transfer
heat exchanger
condensation
condensation hood
Opis:
Combi-steamer condensation hoods are widely used in modern gastronomy. They condense steam produced by the combi-steamer and also filter solid particles, moisture, grease and smells. All these factors negatively affect the staff and dishes, so efficient work of the condensation hoods becomes important. A mathematical and experimental analysis of such a device is described in this paper. First a measurement methodology was designed and measurements of air humidity, temperature and mass flow rates were performed. The measurement procedure concerned dedicated a steam generator and combi-steamer. Next a mathematical model was developed. It was based on mass and energy balances of the condensation hood. The condensate flow rate turned out to be insufficient to fulfill the energy balance while measured directly. Hence, it was calculated from heater’s power of the steam generator and the balance model was validated. The combisteamer had an unknown output, so the condensate flow rate was provided by the balance model after its validation. A preliminary diagnosis of the device was carried out as well.
Źródło:
Archives of Thermodynamics; 2020, 41, 1; 125-149
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing the performance of a solar energy cooling system in Baghdad city
Autorzy:
Ahmed, Muna H.
Al-Salihi, Ali M.
Hussain, Hazim H.
Powiązania:
https://bibliotekanauki.pl/articles/35537880.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
cool building
solar chimney
ground heat exchanger
weather conditions
Opis:
Renewable energy resources have become a promissory alternative to overcome the problems related to atmospheric pollution and limited sources of fossil fuel energy. The technologies in the field of renewable energy are used also to improve the ventilation and cooling in buildings by using the solar chimney and heat exchanger. This study addresses the design, construction and testing of a cooling system by using the above two techniques. The aim was to study the effects of weather conditions on the efficiency of this system which was installed in Baghdad for April and May 2020. The common weather in these months is hot in Baghdad. The test room of the design which has a size of 1 m3 was situated to face the geographical south. The test room is thermally insulated and connected to a solar chimney which generates a convection current to draw the air out of the room through a heat exchanger. The heat exchanger was submerged in a water tank of 2 m length, 1 m width and 1 m height. It was also covered with a layer of soil mixture with a thickness of 10 cm. The experiment simulates the natural conditions of a shallow water surface, connected to the room from the other side. The study results revealed that the air temperature inside the test room was lower than that of the ambient air outside. Pearson correlation coefficient showed that there was a strong direct relationship between solar radiation, temperature and wind speed from one side and the cooling efficiency from the other side. Also, there was a negative correlation between relative humidity and cooling efficiency.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 2; 283-292
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wymiany ciepła oscylującej płytki w ośrodku amoniaku jako nowej koncepcji wymiennika ciepła w elektrycznych silnikach rakietowych
Analysis of the oscillating plate heat exchanger at the ammonia environment as a new concept of heat exchanger for the electric rocket engine
Autorzy:
Florczuk, W.
Kobiera, A.
Powiązania:
https://bibliotekanauki.pl/articles/213269.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
silniki rakietowe
elektrotermiczny napęd rakietowy
wymiennik ciepła z oscylującym elementem grzewczym
rocket engines
new concept heat exchanger
oscilating plate heat exchanger
Opis:
Elektrotermiczny napęd rakietowy ze względu na prostotę swego działania i konstrukcji jest atrakcyjnym rozwiązaniem dla inżynierów projektujących systemy kontroli położenia satelitów. Ciagłe poszukiwanie nowych rozwiązań oraz stosowanie nowych materiałów konstrukcyjnych znacząco podniosły sprawność obecnych silników rakietowych, w tym elektryczno-termicznych typu "Resistojet" . Nowym rozwiązaniem proponowanym w tego typu napędach jest wymiennik ciepła z oscylującym elementern grzewczym. Dzięki temu termiczna warstwa przyścienna Charakteryzująca się znacznie większą temperaturą niż temperatura przepływającego ośrodka, powstająca na płytce jako elemencie grzewczym, odrywa się, a następnie miesza z pozostałą częścią płynu ogrzewając ją. Wykazano, że istnieje granica częstotliwości oscylacji, która w sposób znaczący poprawia efektywność grzania czynnika roboczego. Badania wykonano w ramach projektu ESA PECS 98104 Gas Resistojet Thruster for Medium Size Satellite Attitude Control.
Electric rocket propulsion belong to the group of rocket engines which use thermal energy converted from electric. This energy conversion is crucial problem for this kind of rocket engines. The electric rocket engines are divided by methods of energy conversion and in this work is presented solution for resistance rocket engines called "resistojet". Resistojets are mostly used as a propulsion for attitude control system of satellite platforms because their simplicity, relative high specific impulse and long work-time duration ability. Recently development of new solutions and new materials have significantly increased the efficiency of energy conversion and decreased losses of thermal energy in resistojets. New solution proposed to the resistojets is heat exchanger with flat plate. The phenomena of thermal boundary layer created on surface of plate is additional intensify by high frequency oscillating. Because of dynamic move the boundary layer is broken and mixed in downstream flow. Mixed fluid increase own temperature and enthalpy that is converted to high velocity in the supersonic nozzle. In this work was shown that there is limitation of frequency oscillation of flat plate to enhance thermal process to heating fluid. This work was done as a part of project "ESA PECS 98104 Gas Resistojet Thruster for Medium Size Satellite Attitude Control".
Źródło:
Prace Instytutu Lotnictwa; 2011, 12 (221); 89-101
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamika wymienników ciepła i niestabilności w obiegu ORC
The dynamics of heat exchangers and instabilities in ORC circulation
Autorzy:
Mikielewicz, J.
Mikielewicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/1819596.pdf
Data publikacji:
2011
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
wymiennik ciepła
ORC
niestabilność przepływu
heat exchanger
flow instability
Opis:
Z zagadnieniami odparowania czynników niskowrzących w parowniku mikrosiłowni związane są zagadnienia dynamiki i stabilności hydrodynamiczno-termicznej kanału rekuperatora-parownika, jak też i parownika pary jako całości [1÷4]. Niestabilność przepływu dwufazowego w kanale, w którym odparowuje czynnik wiąże się z wystąpieniem wahań ciśnienia i natężenia przepływu. Zbyt duże wahania ciśnienia są groźne. Mogą powodować deformację ścianek kanału, a w konsekwencji i awarię parownika. Towarzyszące pulsacjom ciśnienia, zmiany natężenia przepływu, mogą z kolei powodować kryzysy form wrzenia, co w rezultacie powoduje obniżenie efektywności wymiany ciepła w rekuperatorze. Niestabilność przepływu pary produkowanej przez parownik może prowadzić do niestabilnej pracy turbiny pracującej na ten czynnik. Stąd też zagadnienie stabilności lokalnej (przepływu w kanale, w którym odparowuje czynnik) jak i ogólnej parownika jako całości, jest ważne dla projektantów parowników mikrosiłowni. Zagadnienie stabilności przepływu dwufazowego w kanale odparowującym czynnik było analizowane w literaturze przedmiotu w aspekcie kotłów parowych. Analiza opierała się o badania charakterystyki hydraulicznej kanału. Stwierdzono, że przyczyną niestabilności przepływu w kanale jest niejednoznaczność charakterystyki spadku ciśnienia w kanale w zależności od zmian natężenia przepływu. Początkowo sądzono, że wystarczy usunąć tę niejednoznaczność, aby zapewnić stabilny przepływ, jednakże jak wykazały późniejsze badania eksperymentalne, tą drogą nie uniknie się niestabilności przepływu typu periodycznego [1÷4]. Niemniej wydaje się, że wstępne rozpatrzenie charakterystyki hydraulicznej kanału będącej źródłem niestabilności, ze względu na prostotę zagadnienia jest uzasadnionym. Takie badanie jest proste i w przypadku stwierdzenia niejednoznaczności charakterystyki hydraulicznej kanału, pozwala na uniknięcie pracochłonnego badania dynamiki układu. Proces wrzenia w przepływie jest złożony. Występuje w nim szereg skomplikowanych zjawisk. Równania dynamiki, jak też i własności czynnika są silnie nieliniowe. W pracy przedstawiono prosty hydrauliczny model pozwalający na analizę niestabilności przepływu. Model taki może służyć do zaprojektowania układu regulacji w mikrosiłowni ORC.
Instability of the twophase flow in a channel where the fluid evaporates is related to occurrence of pressure and flow rate variations. Too excessive variations of pressure may be dangerous as they can lead to deformation of channel walls and in consequence to the breakdown of the evaporator. Changes of mass flow rate, which accompany the pressure pulsations can, on the other hand, lead to boiling crisis, which would reflect in reduced rates of heat exchange in the evaporator. Instabilities of produced in evaporator can lead also to the unstable operation of turbine. Therefore the issue of local and overall stability is of significant importance to the designers of micro CHP systems. The issue of stability of two-phase flow in a channel where reagent evaporates was analyzed in the literature in terms of steam boilers. The analysis was based on studies of hydraulic characteristics of the channel. It was found that the cause of instability of flow in channel is the ambiguity of the characteristics of pressure drop in the channel, depending on changes in flow rate. Initially it was thought that removal this ambiguity would ensure that the flow is stable, however, later experimental studies showed, periodic flow instability cannot be avoided this way. The process of boiling in the flow is complex. It includes a number of complex phenomena. The equations of dynamics, as well as medium properties are highly nonlinear. The paper presents a simple hydraulic model enabling analysis of the system stability and propagation of disturbances induced by a step change of the flow rate. The proposed model can serve in design of the system of control of micro heat exchangers of the micro CHP. The works on implementation of the algorithm and control of operation of the real system are underway.
Źródło:
Rocznik Ochrona Środowiska; 2011, Tom 13; 393-407
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New expression to calculate quantity of recovered heat in the earth-pipe-air heat-exchanger operating in winter heating mode
Autorzy:
Molcrette, Vincent F. A.
Autier, Vincent R. B.
Powiązania:
https://bibliotekanauki.pl/articles/240792.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
earth-pipe-air heat-exchanger
analytical model
air heating
Opis:
A new expression is proposed to calculate the earth-energy of an earth-air-pipe heat exchanger during winter heating for three kinds of soil in France. An analytical model is obtained by using numerical computation developed in Scilab – a free open source software. The authors showed the comparison between their simple analytical model and experimental results. They showed the influence of different parameters to specify the size of the heat exchanger.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 103-117
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of a radiated heat exchanger surface on heat transfer
Autorzy:
Morel, S.
Powiązania:
https://bibliotekanauki.pl/articles/240062.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat exchanger
reciprocal emissivity coefficient
wymiennik ciepła
współczynnik emisyjności
Opis:
The experiment leads to establish the influence of radiated surface development heat exchangers on the values of heat flux transferred with water flowing through the exchangers and placed in electric furnace chamber. The values of emissivity coefficients are given for the investigated metal and ceramic coatings. Analytical calculations have been made for the effect of the heating medium (flame) – uncoated wall and then heating medium (flame) – coated wall reciprocal emissivity coefficients. Analysis of the values of exchanged heat flux were also realized. Based on the measurement results for the base coating properties, these most suitable for spraying the walls of furnaces and heat exchangers were selected, and determined by the intensification of heat exchange effect. These coatings were used to spray the walls of a laboratory waste-heat boiler, and then measurements of fluxes of heat absorbed by the cooling water flowing through the boiler tubes covered with different type coatings were made. Laboratory tests and calculations were also confirmed by the results of full-scale operation on the metallurgical equipment.
Źródło:
Archives of Thermodynamics; 2015, 36, 3; 161-174
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of ultrasonic cleaning for shipborne heat exchangers: Construction, numerical simulation, and verification
Autorzy:
Buse, Hauke
Spangemacher, Lars
Fröhlich, Siegmund
Powiązania:
https://bibliotekanauki.pl/articles/24202542.pdf
Data publikacji:
2022
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ultrasonic
cleaning
heat exchanger
pipe bundle
micro-cavitation
simulation
Opis:
The current article describes the basics and prospects of the ultrasound-assisted cleaning of shell and tube heat exchangers that are used, e.g., on ships. A main issue of seawater heat exchangers is their clogging. After a certain operating time, the fouling process (barnacles, algae, etc.) starts, which results in a decreased performance that produces a noticeably reduced flow rate and a declining transmission of heat energy. Based on the current state of the art, heat exchangers are cleaned by mechanical or chemical (CIP, cleaning in place) methods. Especially on ship-based systems, a mechanical cleaning in very narrow spaces can be difficult and the usage of chemicals for CIP may generally be prohibited. An ultrasound-assisted cleaning would significantly save time and manning. Based on previous experiments, a test reactor represented by a shell and tube heat exchanger with ultrasound-assisted cleaning has been designed. A FEM (finite element method) simulation is performed to provide information about the ultrasound power distribution inside the reactor. Further, the assembly and commissioning of the test reactor with associated comparative measurements were carried out, which are also reported here.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 71 (143); 41--47
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of Process Wastewater Heat
Utylizacja ciepła ścieków poprodukcyjnych
Autorzy:
Szkarowski, Aleksander
Jaworski, Łukasz
Mamedov, Shirali
Powiązania:
https://bibliotekanauki.pl/articles/1811632.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
process wastewaters
heat recovery
shell and tube heat exchanger
cross-flow heat exchanger
ścieki produkcyjne
odzysk ciepła
wymiennik płaszczowo-rurowy
wymiennik krzyżowy
Opis:
This papers presents the results of computation of two heat exchangers used for heat utilization of industrial wastewater generated in a refined fiberboard production plant. The basic task was to cool wastewater to a temperature of approximately 40ºC enabling efficient centrifugation of suspended matter at the stage of wastewater pretreatment. A shell-and-tube heat exchanger with the power of 473 kW for water heating was developed for heating the production hall. A cross-flow exchanger was also developed for heating ventilation air in the boiler room building, power of which is 1703 kW. Thermal and hydraulic computation was performed, the required heat exchange surface was selected, the main structural characteristics of both exchangers were determined.
W niniejszym artykule przedstawiono wyniki obliczeń dwóch wymienników ciepła typu służących do utylizacji ciepła ścieków przemysłowych powstających w zakładzie do produkcji uszlachetnionych płyt pilśniowych. Zadaniem podstawowym było schładzanie ścieków do temperatury ok. 40ºC umożliwiającej sprawne odwirowanie zawieszonych substancji na etapie wstępnego podczyszczania ścieków. Opracowano wymiennik płaszczowo-rurowy podgrzewający wodę na cele ogrzewania hali produkcyjnej o mocy 473 kW. Opracowano również wymiennik krzyżowy na cele podgrzania powietrza wentylacyjnego w budynku kotłowni, którego moc wynosi 1703 kW. Wykonano obliczenia cieplne i hydrauliczne, dobrano wymaganą powierzchnię wymiany ciepła, określono główne charakterystyki konstrukcyjne obu wymienników.
Źródło:
Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 2; 1074-1083
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feasibility of using heat-recovery exchangers in livestock buildings at a site at a specific altitude with a specific average outdoor air temperature
Autorzy:
Sleger, V.
Neuberger, P.
Polak, M.
Powiązania:
https://bibliotekanauki.pl/articles/62353.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
feasibility
heat-recovery exchanger
livestock building
outdoor air temperature
climate condition
Czech Republic
agriculture
air temperature
weather station
ventilation
air exchange
heat exchanger
Opis:
The installation of an energy-saving facility must be preceded by analysis of its financial effectiveness. Among methods enabling such evaluation is the basic net profit calculation method. For this, the annual consumption of electricity for ventilation or of thermal energy for heating must be determined. The calculation formula uses the sum of energies for temperatures within the range from the calculation temperature for the area in question to the long-term average of the maximum temperature at the site, or to the temperature at which the heating power is zero. It is necessary to know the summary time of occurrence of a given temperature during a year. The site data can only be assessed based on long-term meteorological information. In fact, data used by current national standards to describe climatic conditions in the Czech Republic are from the years 1901 to 1950. The dependence of the average yearly temperature on altitude is shown in Fig. 1 for the 1961 1990 and 1991 2000 periods. It is evident that the average temperatures for the latter period are nearly 0.6 K higher than those for the former period, irrespective of the altitude. In this paper the climatic conditions are assessed based on daily data measured throughout the period from 1 January 1991 to 31 December 2000. Weather stations were selected so as to achieve a uniform coverage and continuity of measurement at each site (as far as possible). All the stations lie in the Czech Republic between 48.8° and 50.8° north latitude at altitudes from 158 m to 1324 m. It was the objective of this examination, based on the meteorological data collected to calculate the average number of days and hours during which the temperature during the year is lower than a specific limiting level, in dependence on the average yearly temperature of the site. Fig. 3 shows the average number of days in a year during which a temperature lower than a selected limiting level occurs, as calculated for the 1991 2000 period. The results are presented for 4 areas with average yearly temperatures of 6 °C 7 °C, 7 °C 8 °C, 8 °C 9 °C, and 9 °C 10 °C, respectively. The graphs enables us to ascertain the number of days during which a heating facility is in operation if the facility is activated by outdoor air temperature decrease to below a specific limiting level. If a typical daily temperature wave is considered, the method makes it possible to estimate the number of hours during which the air temperature is lower than the limiting level chosen. The difference between the data for various limiting levels allows us, for an area with a specific average yearly temperature to ascertain the time of occurrence of outdoor temperature within various ranges. The results of calculations are shown in Fig. 4 and Table 1. The method applied enables underlying data to be prepared for the assessment of energy demands for air heating at a given site and for estimation of the energy savings that could be achieved by installing economical air heating facilities in livestock buildings.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2009, 07
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat transfer in compact cross-flow mini heat exchanger
Autorzy:
Prończuk, Mateusz
Pabiś, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/27315660.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
heat transfer
cross-flow
mini heat exchanger
optimization based method
Opis:
This paper presents the results of an analysis of heat transfer in a cross-flow mini heat exchanger (CFMHE). The purpose of the paper was to analyze the results of the experimental measurements presented in the previous work in order to determine dimensionless correlations that allow for the calculation of heat transfer coefficients for the CFMHE. Analyzed CFMHE consisted of a brass cylindrical core, in which 2 mm circular holes were drilled. A method based on an optimization procedure was used to determine the correlations describing the heat transfer coefficients, allowing the correlations to be determined without the need of measuring the mini channel wall temperature. Overall heat transfer coefficients calculated using the proposed correlations typically did not deviate by more than ±10% from the corresponding experimental results, which was a significant improvement in the quality of the fit compared to the results presented in previous work.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 3; 79--88
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model symulacyjny oraz obliczenia wysokotemperaturowego wymiennika ciepła dedykowanego do pracy w układzie mikrokogeneracyjnym
Simulation model and calculation of high temperature shell and tube heat exchanger dedicated to work in microcogeneration
Autorzy:
Król, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/101729.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydział Inżynierii Środowiska i Energetyki. Instytut Techniki Cieplnej
Tematy:
wymiennik ciepła
mikrokogeneracja
obliczenia cieplne
heat exchanger
microcogeneration
thermal calculations
Opis:
Kogeneracja jest to proces zamiany energii chemicznej paliwa na energię mechaniczną, elektryczną, ciepło bądź chłód realizowaną w jednej maszynie lub w zespołach maszyn wzajemnie połączonych ze sobą. Proces ten może być realizowany w dużej skali w konwencjonalnych układach skojarzonych lub w małej lokalnej skali zwanej mikrokogeneracją. Jedną z technologii mikrokogeneracyjnych są układy oparte na silnikach spalinowych. W silnikach istnieje wiele źródeł ciepła, lecz głównie jest to ciepło niskotemperaturowe.W ramach pracy opracowano model obliczeniowy symulujący pracę wymiennika ciepła. Opisano metody obliczeniowe stosowane do szacowania współczynników przenikania ciepła oraz strat ciśnienia. Uzyskano wyniki obliczeń dla stanu nominalnego. Przeprowadzono studium przypadku dla: zmiennych wariantów geometrycznych (zmiana szyku, zmiana średnicy rur, zmiana średnicy płaszcza, zmiana ilości przegród poprzecznych), zmienionego rodzaju paliwa oraz przy zmieniającym się punkcie pracy silnika spalinowego. Uzyskano parametry geometryczne wymiennika do pracy w układach mikrokogeneracyjncyh o niskiej mocy–średnica płaszcza wyniosła 220mm, długość wymiennika 853 mm, liczba rur 87. Wymiennik będzie pracował w zakresie mocy 5-6,5 kW co odpowiada zakresowi regulacji silnika spalinowego. Dodatkowo przeanalizowano możliwości regulacji instalacji pod kątem przepływającego glikolu, dla zachowania stałego przyrostu temperatury w wymienniku. Instalację należy regulować w przedziale 12-18kg/min.
Cogeneration is the conversion process of fuel chemical energy into mechanical, electric, heat or cool produced in one machine or in group with connection between them. This process can be conducted in the large scale in classic CHP units or in the small local scale which is known as microcogeneration. One of microcogeneration technologies are systems based on internal combustion engines. There are various sources of utility heat, but significant amount of them are low temperature heat. In this thesis mathematical model dedicated to simulation heat ex-changer work was created. Calculations used to estimate convective heat transfer coefficient and pressure loses were described and results in nominal state were obtained. Furthermore afew case studies which took under consideration:variable geometrical parameters (pattern change, change of pipe diameter, change of shell diameter, various baffle number), various fuel type andwere conductedin engine different working conditions.Typical parameters for shell and tube dedicated for low power microcogeneration has been obtained–for shell diameter 220 mm, for heat exchanger length 853, and amounts of pipes 87. Heat Exchanger will be working in power range 5-6,5 kW, what is connected with engine regulation range. Additionally regu-lation perspective has been analyzed, when constant temperature growth is needed installation should be regulated in range 12-18 kg/min.
Źródło:
Archiwum Instytutu Techniki Cieplnej; 2018, 5; 63-89
2451-277X
Pojawia się w:
Archiwum Instytutu Techniki Cieplnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of calculation of heat exchanger based on different sizes slit channel
Metodyka obliczeń wymienników ciepła oparta na podstawie różnych wymiarów szczeliny kanału
Autorzy:
Malkin, E.
Furtat, I.
Dyachkov, M.
Powiązania:
https://bibliotekanauki.pl/articles/2068319.pdf
Data publikacji:
2014
Wydawca:
Politechnika Częstochowska
Tematy:
wymiennik ciepła
mikrokanał
aluminium
miedź
heat exchanger
microchannel
aluminum
copper
Opis:
This paper presents calculation of power of microchannel copper and aluminium heat exchanger at a constant width of microchannels.
W pracy przedstawiono obliczenia siły w mikrokanałach miedzianych i aluminiowych wymienników ciepła przy stałej szerokości mikrokanałów.
Źródło:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2014, 20 (170); 163--168
0860-7214
Pojawia się w:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing of Metal Foam Design for the Use as a Heat Exchanger
Autorzy:
Radkovský, F.
Gebauer, M.
Merta, V.
Powiązania:
https://bibliotekanauki.pl/articles/947585.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal foam
3D modeling
heat exchanger
heat conduction
efficiency
Opis:
The work deals with possibilities of using this specific material. It is focused on cast metal foams with a regular arrangement of internal cells and it refers to already used casting technologies – the production of metal foams with the aid of sand cores. Metal foams are used in many industries, such as: automotive, aerospace, construction, power engineering. They have unique propertiesand due to lower weight with sufficient strength and greater contact surface can be used, for example, for the conduction of heat. This article deals with the use of the metal foam as a heat exchanger. The efficiency of the heat exchanger depends on its shape and size and therefore the study is focused first on the optimization of the shape before the proper manufacture.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1875-1881
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PIV measurement of tube-side in a shell and tube heat exchanger
Autorzy:
Wang, K.
Zhang, Z.
Liu, Q.
Tu, X.
Hyoung-Bum, K.
Powiązania:
https://bibliotekanauki.pl/articles/778192.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
shell and tube heat exchanger
tube-side
PIV
unsteady flow
Opis:
In order to improve the performance of the shell and tube heat exchanger, a porous baffle and a splitter bar are employed in this research. Through the arrangement of the porous baffle in the tube-side inlet and the splitter bar in the tube, the flow distribution of liquid in the heat exchanger is improved. PIV technology is used to investigate the unsteady flow in the tube-side inlet and the outlet of different models. The porous baffle significantly improves the flow of fluid in the shell and tube heat exchanger, especially by eliminating/minimizing the maldistribution of fluid flow in the tube-side inlet. The performance of the arc baffle is better than that of the straight baffle. The splitter bar has a minimal effect on the flow field of the tube-side inlet, but it effectively improves the flow in the tube bundle and restrains the vortex generation in the tube-side outlet.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 1; 60-66
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of the heat power of a tube heat exchanger
Autorzy:
Rup, Kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/2091366.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat power
tube-in-tube exchanger
analytical solutions
numerical calculations
Opis:
In this paper, the logarithmic mean temperature difference method is used to determine the heat power of a tube-in-tube exchanger. Analytical solutions of the heat balance equations for the exchanger are presented. The considerations are illustrated by an example solution of the problem. In particular, the heat power of the tube-in-tube heat exchanger is determined taking into account the variants of work in the co-current and counter-current mode. Apart from the analytical solutions, appropriate numerical calculations in Matlab environment have been carried out.
Źródło:
Archives of Thermodynamics; 2022, 43, 1; 127--140
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of non-equidistant baffle spacing in a small shell and tube heat exchanger
Autorzy:
Aziz, Abdullah
Rehman, Shafique
Powiązania:
https://bibliotekanauki.pl/articles/240423.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal distribution
baffle spacing
heat exchanger
turbulence modeling
CFD study
Opis:
Most of the formulations regarding the characteristics of a shell and tube heat exchanger have a common assumption; namely that the baffle plates are equidistant. This assumption fails to cater the real world scenario for defective baffles as the alteration in a shell and tube heat exchanger invalidates the equidistant baffle spacing of the plates. In this regard, a small six baffles heat exchanger was modeled in the computational fluid dynamics software package and studied by removing each baffle plate one at a time. Effect of removing each baffle plate on the temperature, pressure, heat transfer coefficient, and total heat transfer rate was recorded. It was observed that variation in the pressure drop for the same number of baffle plates varies along the axial order of the plates. The change in pressure drop due to the removal of the baffle plate near the inlet and the outlet was lowest and reaches a maximum in the axial center. It was also found that the plates below the radial center contribute higher towards the overall heat transfer as compared to those above.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 201-221
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ modernizacji cyklonowych wymienników ciepła na energochłonność procesu wypalania klinkieru
The influence of suspension preheaters modernization on the energy consumption during cement manufacturing process
Autorzy:
Duda, J.
Wasilewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/392115.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
wypalanie klinkieru
dekarbonizacja wstępna
energochłonność
odpylanie
wymiennik ciepła
wymiennik cyklonowy
modernizacja
clinker burning
initial decarbonization
energy consumption
dedusting
heat exchanger
cyclone heat exchanger
modernization
Opis:
Nowe techniki wypalania klinkieru w piecach obrotowych z układami wstępnej dekarbonizacji wymagają zastosowania nowych, charakteryzujących się niższymi oporami hydraulicznymi i wyższymi sprawnościami odpylającymi, konstrukcji wymienników cyklonowych. W pracy zostały przedstawione przykładowe sposoby modernizacji konstrukcji cyklonowych wymienników ciepła. Dokonano także analizy wpływu tych zmian na zmniejszenie zużycia energii w procesie wypalania klinkieru.
New techniques of clinker burning require utilization of a new suspension preheaters design characterized by a lower hydraulic resistance and higher efficiency de-dusting. In this paper, examples of ways to modernize the structure of suspension preheaters were presented. An analysis of the influence of those changes on reduction of energy consumption during cement manufacturing process was also conducted.
Źródło:
Prace Instytutu Ceramiki i Materiałów Budowlanych; 2012, R. 5, nr 11, 11; 20-29
1899-3230
Pojawia się w:
Prace Instytutu Ceramiki i Materiałów Budowlanych
Dostawca treści:
Biblioteka Nauki
Artykuł

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