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Title: An analysis of heat flow through a borehole heat exchanger validated model
Authors: Florides, Georgios A. 
Pouloupatis, Panayiotis 
Christodoulides, Paul 
Keywords: Mathematical models;Heat exchangers;Heat--Convection;Computer simulation;Thermal conductivity
Category: Electrical Engineering, Electronic Engineering, Information Engineering
Field: Engineering and Technology
Issue Date: 2012
Publisher: Elsevier
Source: Applied Energy, 2012, Volume 92, Pages 523-533
Abstract: Earth heat exchangers are essential parts of the ground-source heat pumps and the accurate prediction of their performance is of fundamental importance. This paper presents the development and validation of a numerical model for the simulation of energy flows and temperature changes in and around a borehole heat exchanger when a fluid circulates through a U-tube. Based on the time-dependent convection-diffusion equation, the FlexPDE software package is employed to solve the resulting boundary value problem that model a heat exchanger. First, the mathematical model is validated through a comparison with data obtained from experiments with real borehole set-ups in Cyprus. Then the validated model is used to study the heat flow and the temperature variation in the heat-exchanger. Finally conclusions are extracted on how various parameters like the U-tube diameter, the variation of the ground thermal conductivity and specific heat and the borehole filling material affect the temperature of the inlet and outlet fluid.
ISSN: 03062619
Rights: © 2011 Elsevier Ltd.
Type: Article
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