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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2014007228
pages 417-427

A NEW METHOD TO DETERMINE THE THERMAL PROPERTIES OF SOIL FOR VERTICAL-BOREHOLE GROUND-SOURCE HEAT PUMP SYSTEMS

Xingjie Dong
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai 200240, China
Bo Gu
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai 200240, China

ABSTRACT

This paper presents a new method to determine the thermal properties of soil for a vertical-borehole ground-source heat pump. The method proposed is the result of combining the experimental and numerical study with the parameter estimation technique. The experimental study is an in situ thermal response test and the numerical study is the solution of the model of heat transfer inside/outside the borehole. The results show that the parameters including the soil thermal conductivity, borehole thermal resistance, and soil thermal diffusivity are accurately obtained and verified with the aid of experimental data. The method can accommodate well to the variable heat input conditions, and also it concludes that the models of heat transfer inside/outside the borehole are feasible to simulate the borehole heat transfer process.


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