Abstract In this paper, the thermal performance of a heat pump connected to the qanat has been experimentally investigated in both heating and cooling modes. For this purpose, a test site consisting of a heat pump, a coil submerged in the qanat and the measuring and monitoring equipment was designed, constructed and tested. A conventional air-source heat pump system was also used for comparison of the heat pump performance with different heat sources/sinks. Results showed that the efficiency of the air-source heat pump is strongly influenced by environmental conditions, whereas the efficiency of the qanat-source heat pump is very stable and has a good performance throughout the year. In the cooling mode, the energy efficiency ratio (EER) of the qanat-source heat pump varied from 3.77 to 3.7, changing 1.8 %, while the EER of the air-source system fluctuated between 3.14 and 2.95, indicating a 6 % decline. In heating mode, the qanat-source system was also very stable, with a 1.5 % variation in the coefficient of performance (COP) from 3.85 to 3.91, while the COP of the air-source system fluctuated between 3.37 and 3.05, indicating a 9 % change, because of the high fluctuations of the ambient temperature in the heating season in the test site location. The results revealed that the system can be used as an energy-efficient and sustainable alternative to conventional heating and air conditioning systems.

中文翻译：

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坎儿井热泵热力性能试验研究

摘要 本文通过实验研究了连接到坎儿井的热泵在加热和冷却模式下的热性能。为此，设计、建造和测试了一个由热泵、淹没在坎儿井中的盘管以及测量和监测设备组成的试验场。传统的空气源热泵系统也用于比较不同热源/散热器的热泵性能。结果表明，空气源热泵的效率受环境条件影响较大，而坎儿井源热泵的效率非常稳定，全年性能良好。在制冷模式下，坎儿井源热泵的能效比（EER）从3.77变化到3.7，变化1.8%，而空气源系统的EER在3.14和2.95之间波动，下降了6%。在采暖模式下，坎儿井系统也非常稳定，性能系数（COP）从3.85到3.91有1.5%的变化，而空气源系统的COP在3.37和3.05之间波动，表明9 % 变化，因为测试现场位置的采暖季节环境温度波动较大。结果表明，该系统可用作传统供暖和空调系统的节能且可持续的替代方案。而空气源系统的COP在3.37和3.05之间波动，变化为9%，这是由于试验现场采暖季节环境温度波动较大。结果表明，该系统可用作传统供暖和空调系统的节能且可持续的替代方案。而空气源系统的COP在3.37和3.05之间波动，变化为9%，这是由于试验现场采暖季节环境温度波动较大。结果表明，该系统可用作传统供暖和空调系统的节能且可持续的替代方案。