武汉与重庆典型地质结构下的地埋管换热性能

Analysis on heat transfer performance of ground heat exchangers with typical geological structure in Wuhan and Chongqing

地埋管地源热泵换热器的换热性能受到不同地质结构的影响。以武汉和重庆地区的典型地质构成为边界条件,建立了三维地埋管的单孔双U管换热模型,通过模型计算,获得了两种地质条件下的地埋管换热性能,以重庆地区的地源热泵热响应测试结果以及工程运行数据出发,对模型的计算结果进行了验证,结果表明,模型吻合度较好,可以应用于工程分析。以模型为条件,进行地质结构对换热性能的影响度分析,预测了两地地埋管地源热泵的换热性能并计算得到换热器的平均换热系数分别为武汉地区K1=1.65(W/m·K),重庆地区K2=1.51(W/m·K)。

The heat transfer performance of ground heat exchangers （GHEs） is influenced by different geological structures. A three-dimensional heat transfer model of double U-type GHEs is established with typical geological structure of Wuhan and Chongqing as boundary conditions separately. The heat transfer performances are obtained through the model calculation. The simulation results are validated by a practical thermal response test of a ground source heat pump （GSHP） system, which shows a good match between the simulated and experimental results. The influence of geological structure on heat transfer performances is investigated and the heat transfer performance of GSHP systems can be predicted. Besides, the average heat transfer coefficient of GHEs is calculated in these two area with the proposed model, and the average heat transfer coefficient of the heat exchanger is K1 =1.65 （w/re. K） in Wuhan area, K2 =1.51 （w/m. K）in Chongqing area, respectively.