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首先,对直接膨胀式地源热泵的性能进行了理论分析.与常规地源热泵相比,直接膨胀式地源热泵的地埋管换热器热阻更小,在制冷工况下具有更低的冷凝温度,在制热工况下具有更高的蒸发温度,因此它具有更高的性能系数.直接膨胀式地源热泵系统无需二次换热回路和循环水泵,因此具有更高的系统性能系数.然后,根据实测数据对直接膨胀式地源热泵实验系统的性能进行了分析.该实验系统建立在中国湘潭,其U形垂直地埋管换热器置于水井之中,地埋管换热器的长度为42m,外径为12.7mm.测试结果表明,在制热工况下此直接膨胀式地源热泵系统的性能系数最大值为5.95,平均值为4.72.
First of all, the theoretical analysis of the performance of direct-expansion ground source heat pump is made.Compared with the conventional ground source heat pump, the ground heat exchanger of direct expansion type ground source heat pump has lower thermal resistance and lower cooling performance Of the condensing temperature in the heating conditions have a higher evaporation temperature, so it has a higher coefficient of performance. Direct expansion of the ground-source heat pump system without secondary heat exchange circuit and the circulating pump, it has higher system performance Coefficient.According to the measured data, the performance of direct-expansion ground-source heat pump experimental system is analyzed.The experiment system is based on Xiangtan, China. The U-shaped vertical buried heat exchanger is placed in the well, The length of the heater is 42m and the outer diameter is 12.7mm.The test results show that the maximum coefficient of performance coefficient of this direct-expansion ground-source heat pump system is 5.95 with an average of 4.72 under heating conditions.