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TEMPERATURE PROFILES IN GROUND HEAT EXCHANGERS

100%
Larwa B., Kupiec K.
Czasopismo Techniczne
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-
PL
A mathematical model of a ground heat exchanger cooperating with a heat pump was presented. The model is based on a one-dimensional heat conduction equation with an internal heat source. On the basis of the solutions to the model equations, both the temperature distribution of different types of ground at different times of year as well as the time courses of temperature at different depths are shown. Calculations based on the presented model can be useful for the simulation and design of this apparatus.
2
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Heat conduction in the ground under natural conditions and with heat exchanger installed

81%
Larwa B., Kupiec K., Komorowicz T., Neupauer K.
Czasopismo Techniczne
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-
PL
The results of calculations of the heat transfer in a horizontal ground heat exchanger are presented. The applied model is based on a one-dimensional equation of the transient heat conduction with an internal heat source. The model was correctly verified by comparison of computational results and experimental measurements presented in literature. Thermal calculations concerning heat transfer in the ground under natural conditions are also presented.
3
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Adsorption in Perfect Mixing Tank – Comparison of Exact and Approximate Kinetic Models

81%
Kupiec K., Gwadera M., Larwa B.
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vol. 35
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issue 3
277-291
EN
Periodic adsorption in a perfect mixing tank of a limited volume was considered. It was assumed that the adsorption rate is limited by diffusion resistance in a pellet. The approximate model of diffusion kinetics based on a continued fraction approximation was compared with the exact analytical solution. For the approximate model an algorithm was developed to determine a temporal variation of the adsorbate concentration in the pellet. The comparison was made for different values of the adsorbent load factor. In the numerical tests different shapes of pellets were considered. Both the numerical tests as well as our own experimental results showed that the approximate model provides results that are in good agreement with the exact solution. In the experimental part of this work adsorption of p-nitrophenol and acetic acid from aqueous solutions on cylindrical pellets of activated carbon was conducted.
4
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Modelling of Heat Transfer in Ground Heat Exchangers

71%
Larwa B., Gwadera M., Komorowicz T., Kupiec K., Teper M.
Czasopismo Techniczne
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-
PL
The results of the numerical simulation of heat conduction in ground with a horizontal, tubular (parallel pipes) heat exchanger installed are presented in this paper. On the basis of analysis of courses of temperature isolines in the ground, a simplified mathematical heat transfer model in a horizontal ground exchanger was developed. The ground thermal diffusivity was assumed to be a variable of location. On the basis of the model, the temperature profiles in the ground with a heat exchanger installed were determined.
5
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Modelling of Heat Transfer in Ground Heat Exchangers

71%
Larwa B., Gwadera M., Komorowicz T., Kupiec K., Teper M.
|
PL
The results of the numerical simulation of heat conduction in ground with a horizontal, tubular (parallel pipes) heat exchanger installed are presented in this paper. On the basis of analysis of courses of temperature isolines in the ground, a simplified mathematical heat transfer model in a horizontal ground exchanger was developed. The ground thermal diffusivity was assumed to be a variable of location. On the basis of the model, the temperature profiles in the ground with a heat exchanger installed were determined.
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