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地源热泵在夏季冷负荷高于冬季热负荷地区运行会造成土壤热不平衡,常年运行导致土壤温度升高,影响地源热泵性能。为了解决这个问题,本文提出一种带有气冷器的二氧化碳地源热泵系统,建立了该系统的性能预测模型,并将该系统与传统的地源热泵系统进行了对比和经济性分析。结果表明,通过将一部分排热量利用二氧化碳气冷器排放到空气中,并根据温度条件和负荷改变热泵运行的时间表,土壤热不平衡的问题得到了显著的改善,在适当的运行方式下,土壤热不平衡可以完全消除。对比发现,耦合工作的气冷器-二氧化碳地源热泵年运行费用比普通的R134a地源热泵低23%,初始投资低20%。
Ground source heat pump operation in the summer when the cold load is higher than that in the winter heat load area will cause the soil thermal imbalance, and the perennial operation causes the soil temperature to rise, affecting the performance of the ground source heat pump. In order to solve this problem, this paper proposes a CO2 source ground source heat pump system with an air cooler. The performance prediction model of the system is established, and the system is compared with the traditional ground source heat pump system and economic analysis. The results show that the issue of soil thermal imbalance has been significantly improved by using a portion of the exhaust heat to be discharged into the air using a carbon dioxide gas cooler and changing the heat pump operating schedule based on temperature conditions and load. Under appropriate operating modes, Soil thermal imbalance can be completely eliminated. In comparison, it is found that the operating cost of the coupled gas cooler CO 2 source heat pump is 23% lower than that of an ordinary R134a GSHP and the initial investment is 20% lower.