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Wyświetlanie 1-10 z 232
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:
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:
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:
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:
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:
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:
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
Wyświetlanie 1-10 z 232

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