两种土壤热物性测试方法试验研究及影响因素分析

Experimental Study of Heat Transfer of Boreholes in Closed Loop Vertical Ground Heat Exchangers in a Cold Winter and Hot Summer Area

地源热泵空调系统目前在国内已得到广泛使用,而地埋管周围岩土体的热物性的获取对于其系统设计及研究至关重要。本文通过对近水源和较远水源的测试井进行实地测试,对比了应用热响应原理的岩土体热物性的测定方法与直接测试法所得出的土壤导热系数和热扩散率,结果表明热响应原理测试计算所得的热物性具有较高的准确性。

As a renewable energy technology for space heating and cooling,ground source heat pump（GSHP） systems have been encouraged to be used by China government.In Jiangsu Province,located at the East China,the zone with hot summer and cold winter,the number of closed loop vertical ground source heat pump systems is increasing rapidly in recent years.Accurate soil property is helpful for properly using ground source heat pump.This paper reported the preliminary results investigate the soil parameters and the potential to use ground heat source pump for a stage of long term project.Thermal response and measured soil samples from borehole were used to measure the conductivity of soil and results are compared.Results show that thermal response measured synthetic soil conductivity is higher than that measured samples directly.And the borehole close to river has higher water content and higher synthetic conductivity which is due to the enhancement of heat transfer by slowly water flow.