Evaluation of heat exchange rate of GHE in geothermal heat pump systems

被引：69
|
作者：
Jun, Liu [1 ]
Xu, Zhang [1 ]
Jun, Gao [1 ]
Jie, Yang [1 ]
机构：
[1] Tongji Univ, Coll Mech Engn, Inst HVAC & GAS Engn, Shanghai 200092, Peoples R China
来源：
RENEWABLE ENERGY | 2009年 / 34卷 / 12期
关键词：
Geothermal heat pump; Ground heat exchanger; Linear source theory; Cylindrical source theory; Thermal resistance; Heat exchange rate; IN-SITU DETERMINATION; THERMAL PERFORMANCE;
D O I：
10.1016/j.renene.2009.04.009
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Total thermal resistance of ground heat exchanger (GHE) is comprised of that of the soil and inside the borehole. The thermal resistance of soil can be calculated using the linear source theory and cylindrical source theory, while that inside the borehole is more complicated due to the integrated resistance of fluid convection, and the conduction through pipe and grout. Present study evaluates heat exchange rate per depth of GHE by calculating the total thermal resistance, and compares different methods to analyze their similarities and differences for engineering applications. The effects of seven separate factors, running time, shank spacing, depth of borehole, velocity in the pipe, thermal conductivity of grout, inlet temperature and soil type, on the thermal resistance and heat exchange rate are analyzed. Experimental data from several real geothermal heat pump (GHP) applications in Shanghai are used to validate the present calculations. The observations from this study are to provide some guidelines for the design of GHE in GHP systems. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2898 / 2904
页数：7
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