加热功率对岩土体导热系数及单孔换热量的影响

Effects of Heating Pow er to Rock and Soil Thermal Conductivity and Soil Heat Exchange of Single- Hole

在进行地源热泵系统设计时,岩土体的导热系数及其单孔换热量是必不可少的参数。使用Dn32的双U型管,进行了一组不同加热功率的岩土体热响应试验,其加热功率分别为2 832 W和5 494 W。试验结果表明,加热功率对岩土体导热系数大小基本无影响,而单孔换热量跟加热功率密切相关,因此,对于单孔热响应试验,给出单孔换热量的同时必须指出其相应的功率。

In the ground source heat pump system design, both the thermal conductivity of rock and soil heat exchange of single-hole are essential parameters. A set of rock and soil thermal response test with different heating power is carried out using Dn32 double-U-tube. The heating power are 2 832 W and5 494 W respectively. The results show that heating power has no influence to the thermal conductivity of rock and soil, but the soil heat exchange of single-hole is related to heating power. So, for single-hole thermal response test, the given heat exchange must be noted that the corresponding heating power.