现场测定土壤导热系数的影响因素分析

Influence Factors Analysis on In situ Test of Ground Thermal Conductivity

地源热泵空调系统利用土壤作为埋地管换热器的热源或热汇,对建筑物进行供热和供冷.在埋地管换热器设计中,土壤的导热系数是很重要的参数.利用土壤导热系数的热响应测试原理,分析了现场测定土壤导热系数的影响因素.结果表明:在现场实测土壤导热系数时测试时间要足够长,测试时工况稳定后的流体进出口温度及模拟季节都会影响测试结果的准确性.

The ground is used as an energy source or sinks in the ground source heat pump systems which are increasingly popular for heating and cooling in commercial and residential buildings. Ground thermal conductivity is the key parameter in the design of borehole heat exchangers. Influence factors on in-situ test are discussed based on the thermal response tests. The results show that the length of measurement period must be long enough. And the fluid inlet and outlet temperature and simulative seasons would affect on the accuracy of the result.