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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:
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:
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:
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:
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:
Investigation of thermal-flow characteristics of the minichannel heat exchanger of variable louvers height
Autorzy:
Romaniak, Artur
Kowalczyk, Michał Jan
Łęcki, Marcin
Gutkowski, Artur
Górecki, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/27312209.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
CFD
heat transfer
heat pump
louvered fin
minichannel heat exchanger
Opis:
The numerical simulation of the heat transfer in the flow channels of the minichannel heat exchanger was carried out. The applied model was validated on the experimental stand of an air heat pump. The influence of louver heights was investigated in the range from 0 mm (plain fin) to 7 mm (maximum height). The set of simulations was prepared in Ansys CFX. The research was carried out in a range of air inlet velocities from 1 to 5 m/s. The values of the Reynolds number achieved in the experimental tests ranged from 93 to 486. The dimensionless factors, the Colburn factor and friction factor, were calculated to evaluate heat transfer and pressure loss, respectively. The effectiveness of each louver height was evaluated using the parameter that relates to the heat transfer and the pressure drop in the airflow. The highest value of effectiveness (1.53) was achieved by the louver height of 7 mm for the Reynolds number of around 290.
Źródło:
Archives of Thermodynamics; 2023, 44, 3; 119--141
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodology of heat transfer and flow resistance measurement for matrices of rotating regenerative heat exchangers
Autorzy:
Butrymowicz, D.
Karwacki, J.
Kwidziński, R.
Śmierciew, K.
Gagan, J.
Przybyliński, T.
Skiepko, T.
Łapin, M.
Powiązania:
https://bibliotekanauki.pl/articles/185740.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer
single blow technique
rotating heat exchanger
regenerator
przenikania ciepła
wymiennik ciepła
Opis:
The theoretical basis for the indirect measurement approach of mean heat transfer coefficient for the packed bed based on the modified single blow technique was presented and discussed in the paper. The methodology of this measurement approach dedicated to the matrix of the rotating regenerative gas heater was discussed in detail. The testing stand consisted of a dedicated experimental tunnel with auxiliary equipment and a measurement system are presented. Selected experimental results are presented and discussed for selected types of matrices of regenerative air preheaters for the wide range of Reynolds number of gas. The agreement between the theoretically predicted and measured temperature profiles was demonstrated. The exemplary dimensionless relationships between Colburn heat transfer factor, Darcy flow resistance factor and Reynolds number were presented for the investigated matrices of the regenerative gas heater.
Źródło:
Chemical and Process Engineering; 2016, 37, 3; 341-358
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the dynamic operation of a small fin plate heat exchanger – parametric analysis
Autorzy:
Motyliński, K.
Kupecki, J.
Powiązania:
https://bibliotekanauki.pl/articles/240771.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fin plate heat exchanger
modeling
dynamic operation
heat transfer
modelowanie
działania dynamiczne
wymiana ciepła
Opis:
Given its high efficiency, low emissions and multiple fuelling options, the solid oxide fuel cells (SOFC) offer a promising alternative for stationary power generators, especially while engaged in micro-combined heat and power (μ-CHP) units. Despite the fact that the fuel cells are a key component in such power systems, other auxiliaries of the system can play a critical role and therefore require a significant attention. Since SOFC uses a ceramic material as an electrolyte, the high operating temperature (typically of the order of 700–900°C) is required to achieve sufficient performance. For that reason both the fuel and the oxidant have to be preheated before entering the SOFC stack. Hot gases exiting the fuel cell stack transport substantial amount of energy which has to be partly recovered for preheating streams entering the stack and for heating purposes. Effective thermal integration of the μ-CHP can be achieved only when proper technical measures are used. The ability of efficiently preheating the streams of oxidant and fuel relies on heat exchangers which are present in all possible configurations of power system with solid oxide fuel cells. In this work a compact, fin plate heat exchanger operating in the high temperature regime was under consideration. Dynamic model was proposed for investigation of its performance under the transitional states of the fuel cell system. Heat exchanger was simulated using commercial modeling software. The model includes key geometrical and functional parameters. The working conditions of the power unit with SOFC vary due to the several factors, such as load changes, heating and cooling procedures of the stack and others. These issues affect parameters of the incoming streams to the heat exchanger. The mathematical model of the heat exchanger is based on a set of equations which are simultaneously solved in the iterative process. It enables to define conditions in the outlets of both the hot and the cold sides. Additionally, model can be used for simulating the stand-alone heat exchanger or for investigations of a semiadiabatic unit located in the hotbox of the μ-CHP unit.
Źródło:
Archives of Thermodynamics; 2015, 36, 3; 85-103
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational analysis for the effect of the taper angle and helical pitch on the heat transfer characteristics of the helical cone coils
Analiza numeryczna różnic między charakterystykami działania stożkowych wężownic spiralnych i zwykłych wężownic spiralnych stosowanych jako osuszacze w zespołach osuszania i nawilżania w instalacjach odsalania wody
Autorzy:
Abo-Elazm, M
Ragheb, A
Elsafty, A
Teamah, M
Powiązania:
https://bibliotekanauki.pl/articles/139629.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computational analysis
helical cone coil
heat exchanger
heat transfer
analiza numeryczna
wężownica spiralna stożkowa
wymiennik ciepła
wymiana ciepła
Opis:
This numerical research is devoted to introducing the concept of helical cone coils and comparing the performance of helical cone coils as heat exchangers to the ordinary helical coils. Helical and spiral coils are known to have better heat and mass transfer than straight tubes, which is attributed to the generation of a vortex at the helical coil. This vortex, known as the Dean Vortex, is a secondary flow superimposed on the primary flow. The Dean number, which is a dimensionless number used in describing the Dean Vortex, is a function of Reynolds Number and the square root of the curvature ratio, so varying the curvature ratio for the same coil would vary the Dean Number. Numerical investigation based on the commercial CFD software fluent is used to study the effect of changing the structural parameters (taper angle of the helical coil, pitch and the base radius of curvature changes while the height is kept constant) on the Nusselt Number, heat transfer coefficient and coil outlet temperature. Six main coils having pipe diameters of 10 and 12.5 mm and base radius of curvature of 70, 80 and 90 mm were used in the investigation. It was found that, as the taper angle increases, both Nusselt Number and the heat transfer coefficient increase, also the pitch at the various taper angles was found to have an influence on Nusselt Number and the heat transfer coefficient. A MATLAB code was built to calculate the Nusselt Number at each coil turn, then to calculate the average Nusselt number for all of the coil turns. The MATLAB code was based on empirical correlation of Manlapaz and Churchill for ordinary helical coils. The CFD simulation results were found acceptable when compared with the MATLAB results.
W pracy przedstawiono badania numeryczne mające na celu prezentację koncepcji stożkowych wężownic spiralnych i porównanie charakterystyk ich działania jako wymienników ciepła do charakterystyk zwykłych wężownic spiralnych. Jak wiadomo, wężownice spiralne i stożkowe charakteryzują się lepszym przenoszeniem ciepła i masy niż proste rury, co jest związane z powstawaniem wiru w wężownicy spiralnej. Ten tzw. wir Deana (Dean Vortex) jest przepływem wtórnym, nałożonym na przepływ pierwotny. Bezwymiarowy współczynnik Deana, stosowany do opisu wiru Deana, jest funkcją liczby Reynoldsa i pierwiastka kwadratowego ze współczynnika krzywizny, toteż liczba Deana zmienia się dla danej wężownicy wraz z jej krzywizną. Obliczenia numeryczne wykonano przy użyciu komercyjnego oprogramowania CFD w celu zbadania wpływu zmian parametrów strukturalnych wężownicy spiralnej (kąt zbieżności, skok i promień bazowy krzywizny zmieniały się, podczas gdy wysokość pozostawała stała) na liczbę Nusselta, współczynnik wymiany ciepła i temperaturę na wyjściu wężownicy. W badaniach wykorzystano sześć głównych wężownic, o średnicach rury 10 i 12,5 mm i promieniach bazowych krzywizny 70, 80 i 90 mm. W wyniku badań stwierdzono, że zarówno liczba Nusselta jak współczynnik wymiany ciepła rosną wraz ze wzrostem kąta zbieżności. Stwierdzono również, że przy różnych kątach zbieżności skok spirali ma wpływ na liczbę Nusselta i współczynnik wymiany ciepła. Opracowano program w środowisku MATLAB przy pomocy którego obliczono liczby Nusselta dla każdego zwoju wężownicy; na tej podstawie obliczono następnie wartość średnią liczby Nusselta dla całej wężownicy. Program obliczeniowy był oparty na równaniu empirycznym Manlapaza i Churchilla dla zwykłych wężownic spiralnych. Wyniki symulacji uzyskane przy użyciu oprogramowania CFD okazały się możliwe do przyjęcia w zestawieniu z wynikami obliczeń w programie MATLAB.
Źródło:
Archive of Mechanical Engineering; 2012, LIX, 3; 361-375
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Thermophysical Processes in Ground-air Heat Exchangers of the Geothermal Ventilation System
Procesy cieplno-fizyczne w gruntownym wymienniku ciepła geotermalnego systemu wentylacji
Autorzy:
Zhelykh, V.
Savchenko, O.
Kozak, C.
Powiązania:
https://bibliotekanauki.pl/articles/2065452.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska
Tematy:
ground-air heat exchanger
geothermal ventilation
heat transfer
heat balance
wymiennik ciepła ziemia-powietrze
wentylacja geotermalna
bilans cieplny
wymiana ciepła
Opis:
Heat transfer processes that occur when working the ground-air heat exchanger of geothermal ventilation system are considered in this article. The heat balance in the elementary volume of ground-air heat exchanger is proposed on the basis of thermophysical processes. The main factors that affect the process of heat transfer between the outside air and soil was been determined. Initial conditions, which can be used in mathematical and physical modelling of horizontal ground-air heat exchangers for geothermal ventilation systems were selected article presents the experimental study for determining the intensity of radiant energy in the zone irradiated by infrared heaters with their parallel arrangement in relation to the distance between them.
W artykule rozpatrzono procesy wymiany ciepła zachodzące podczas pracy w gruntowym wymienniku ciepła geotermalnego systemu wentylacji. Na podstawie procesów cieplno-fizycznych zaproponowano model bilansu cieplnego w elementarnej objętości gruntownego wymiennika ciepła. Określono główne czynniki, które wpływają na proces wymiany ciepła między gruntem i powietrzem zewnętrznym. Wyznaczono warunki początkowe, które mogą być wykorzystane przy matematycznym i fizycznym modelowaniu poziomych gruntownych wymienników ciepła w systemach wentylacji geotermalnej.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2016, 2 (18); 103--109
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of particular parameters on the temperature distribution in the impletion of regenerative heat exchanger
Wpływ wybranych parametrów na rozkład temperatury dla okresu nagrzewania wypełnienia regeneracyjnego wymiennika ciepła
Autorzy:
Chylińska, D.
Powiązania:
https://bibliotekanauki.pl/articles/402260.pdf
Data publikacji:
2015
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
regenerative heat exchanger
heat transfer
non-stationary state
method of elementary balances
regeneracyjny wymiennik ciepła
wymiana ciepła
stan niestacjonarny
metoda bilansów elementarnych
Opis:
The article describes the process of unsteady heat transfer that occurs between the impletion of regenerative heat exchanger and the surrounding air. A mathematical model of this phenomenon and its exemplary solution using the method of elementary balances were presented. Numerical calculations using Mathcad were applied. As a result, the set temperature field is formed in the heat exchanger wall. The influence of the geometrical dimensions (length of the filling) and air velocity on the temperature distribution in the fill were analysed.
Źródło:
Structure and Environment; 2015, 7, 1; 29-33
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analyzing temperature changes in the ground massif with a horizontal heat exchanger in the course of the heating season
Autorzy:
Adamovsky, R.
Neuberger, P.
Sed'ova, M.
Powiązania:
https://bibliotekanauki.pl/articles/62442.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
temperature change
ground massif
horizontal heat exchanger
heating season
heat pump
ground source heat pump
heat transfer
energy potential
ground temperature
temperature distribution
Opis:
The article is devoted to temperature changes in the ground massif with the horizontal heat exchanger as an energy source for a heat pump. The article was aimed at analyzing temperature changes in the ground massif with the horizontal heat exchanger at the beginning, in the course of and at the end of the heating season. Another aim was to analyze temperature differences in the area of the horizontal exchanger and the reference lot. The heat flow utilized in the evaporator of heat pump was extracted from the ground exchanger (nominal output at the condenser was 10.5 kW). Temperatures of the ground massif with the horizontal heat exchanger were measured in its plane in depths of 0.75 m, 0.5 m and 0.25 m. The temperature inside the ground massif on the reference lot and ambient parameters were measured as well. It is obvious that the difference of energetic potentials inside the ground massif with the heat exchanger and on the reference lot is insignificant at the beginning of the heating season. During the heating season, the difference of ground massif energetic potentials increases; at the end it is constant. The difference of temperatures in horizontal planes was not significant at the beginning of the heating season; however, it gradually increased. Maximum differences were detected in the area of the heat exchanger. In higher strata, the difference between temperatures decreases. During a major part of the heating season, temperatures at pipes of the ground exchanger were negative. This fact affected amounts of heat extracted from the ground massif.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2010, 11
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature changes in heat pump horizontal ground source
Autorzy:
Adamovsky, R.
Neuberger, P.
Sed'ova, M.
Powiązania:
https://bibliotekanauki.pl/articles/60337.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
temperature change
heat pump
ground massif
horizontal heat exchanger
heat potential
soil
thermal potential
heating period
ground temperature
temperature distribution
heat transfer
energy conservation
Opis:
The paper deals with assessment of thermal fields and temperature changes in ground massif with horizontal heat exchanger used as a heat source for a heat pump. Temperatures in the zone of the horizontal ground exchanger are compared with temperatures in a reference land. Changes of heat potential of the soil during the heating period are also assessed. Possibilities of recovery of thermal potential of the ground massif when utilizing vertical and horizontal exchangers are analyzed in the opening part of the paper. The results of the first verification indicated that average temperatures in the horizontal planes of the ground massif did not differ considerably with distance from the exchanger tube. Differences in average temperatures in reference and experimental lands confirmed sufficient heat potential of the ground massif even at the peak of the heating period. The differences in average temperatures reached up to 6.51 K in the end of the heating period while at the beginning of the heating period, the differences in average temperatures dropped to 1.35 K. The differences between maximum and minimum temperatures in the zone of the ground exchanger reached up to 1.9 K at the peak of the heating period and rose to 3.9 K at the beginning and end of the heating period. The first results of our measurements indicate the necessity of accumulation of thermal energy in the soil massif in the summer period like in case of the vertical exchangers.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2009, 07
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza skuteczności odzyskiwania energii cieplnej z powietrza wywiewanego
Analyzing the operating efficiency of heat energy recovery from outlet air
Autorzy:
Besler, M.
Skrzycki, M.
Powiązania:
https://bibliotekanauki.pl/articles/236472.pdf
Data publikacji:
2009
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
odzyskiwanie energii
system wentylacji
system klimatyzacji
wymiennik ciepła
wymiana ciepła
wymiana masy
energy recovery
ventilation-conditioning system
air-conditioning system
heat exchanger
heat transfer
mass transfer
Opis:
W pracy wykazano celowość odzyskiwania ciepła z powietrza wywiewanego w systemach wentylacyjnych i klimatyzacyjnych w aspekcie oszczędności energii oraz omówiono wynikające z tego korzyści. Przedstawiono podstawy teoretyczne związane z odzyskiwaniem ciepła. Opisano przemiany zachodzące w trakcie procesów wymiany ciepła i masy w wymiennikach do odzyskiwania ciepła. Na podstawie rzeczywistych parametrów z wieloletnich pomiarów powietrza zewnętrznego badanych we Wrocławiu porównano pracę takich urządzeń, jak regeneracyjny obrotowy wymiennik ciepła, krzyżowo-płytowy wymiennik ciepła, regeneracyjny nieobrotowy wymiennik ciepła oraz rurka ciepła. Pracę urządzeń porównano z recyrkulacją powietrza oraz pracą układu bez odzyskiwania ciepła. Przeanalizowano te urządzenia pod kątem różnych trybów pracy w trakcie całorocznej eksploatacji oraz pod kątem wybranych typów paliw, wykorzystanych do wytworzenia ciepła do zasilania układu. Porównując koszt zużycia energii pierwotnej i koszty inwestycyjne urządzeń w różnych układach wentylacyjnych/klimatyzacyjnych wykazano, że w każdym z rozpatrywanych przypadków zastosowanie urządzeń odzyskujących energię z powietrza wywiewanego należy ocenić jako korzystne z punktu widzenia całkowitych kosztów eksploatacji instalacji wentylacyjnych.
The advantages of heat recovery from the outlet air in ventilation and air conditioning systems were analyzed in terms of energy savings and related benefits. The paper also includes theoretical explanations for the basic phenomena and processes dealt with in heat recovery, and describes (in the form of charts) the changes that occur in the state of the air during heat and mass transfer processes in heat exchangers. The study covered the time span of 1998 to 2007, where each year was divided into two thermal seasons: the cold season (temperatures <15 C) and the warm season (temperatures >15 C). Using the real parameter values obtained from many years' external air measurements conducted in the city of Wroclaw, the operating efficiencies were compared for the following devices: rotary heat exchangers, cross-flow heat exchangers, regenerative nonrotary heat exchangers and heat pipes. The operation of the devices was compared with the operation of a system with no heat recovery. The devices were analyzed according to the parameters of the system's operation throughout the year, as well as according to the type of the fuel used for generating the heat supplied to the system. The comparison of the costs of the original energy consumed and the capital costs for the devices of the ventilation/air-conditioning systems examined has revealed that in every instance the application of devices providing energy recovery from outlet air has to be regarded as advantageous in terms of the overall operating costs of the ventilation systems.
Źródło:
Ochrona Środowiska; 2009, 31, 1; 41-47
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The temperature distribution around the single vertical ground heat exchanger calculated by the usage of the method of elementary balances
Rozkład temperatury wokół pojedynczego pionowego wymiennika gruntowego obliczony metodą bilansów elementarnych
Autorzy:
Jurek, A.
Powiązania:
https://bibliotekanauki.pl/articles/402495.pdf
Data publikacji:
2013
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
vertical ground heat exchanger
heat transfer
non-stationary state
temperature field
method of elementary balances
pionowy gruntowy wymiennik ciepła
przenikanie ciepła
stan nieustalony
pole temperatury
metoda bilansów elementarnych
Opis:
The article describes the process of unsteady heat transfer that occurs between the vertical ground heat exchanger and the surrounding soil at a depth that is independent from the temperature on the ground surface. A mathematical model of this phenomenon and its examplary solution using the method of elementary balances were presented. Numerical calculations using Mathcad were applied. As a result, the set temperature field is formed in the heat exchanger wall and the surrounding ground.
Źródło:
Structure and Environment; 2013, 5, 1; 46-50
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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