An analysis of heat flow through a borehole heat exchanger validated model

被引：62

作者：

Florides, Georgios A. ^{[1
]}

Christodoulides, Paul ^{[1
]}

Pouloupatis, Panayiotis ^{[1
]}

机构：

[1] Cyprus Univ Technol, Fac Engn & Technol, Limassol, Cyprus

来源：

APPLIED ENERGY | 2012年 / 92卷

关键词：

Earth heat exchanger; Numerical model; U-tube; Borehole; FlexPDE;

D O I：

10.1016/j.apenergy.2011.11.064

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

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. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：523 / 533

页数：11

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