基于TRNSYS的双U型垂直埋管换热器的模拟分析

以长沙市某一实际工程的双U型垂直埋管换热器为研究对象,利用TRNSYS建立了地埋管的仿真模型,通过仿真模型及正交试验设计方法研究夏季影响埋管周围土壤平均温度的因素,并分析了这些因素的影响程度.结果表明:钻井深度、钻井间距、钻井数量及回填材料导热系数对土壤平均温度有不同程度的影响,其中钻井间距的影响尤为明显.最佳钻井间距应为4~5m,回填材料最佳导热系数为1.7~2.1 W/(m·K),钻井最佳深度为60~100m.

Model of Double U-tube Heat Exchangers Based on TRNSYS

Based on double U-tube heat exchangers of an actual construction in Changsha, a simulation model of ground heat exchangers was built up with the help of software TRNSYS. Combining the simulation model and orthogonal design, this paper studied the factors affecting soil average temperature around double U-tube heat exchangers, and analyzed effect degree of these factors. The results showed that borehole depth, borehole spacing, borehole amount and fill thermal conductivity had different influence on soil average temperature, and borehole spacing effect was particularly obvious. Finally, value range of borehole depth, borehole spacing and fill thermal conductivity were presented orderly as follows: 60~100 meters,4~5 meters,1.7~2.1 W/(m·K).