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建立地埋管传热模型和系统能耗模型,对非平衡冷热负荷条件下地源热泵系统运行特性进行模拟计算。当建筑空调冷负荷大于热负荷,且供冷时间较长时,地源热泵系统从冬季初始运行,到达夏季时段,地温比夏季初始运行低,更加有利于夏季地源热泵系统节能。地源热泵系统运行7a后,采取夏季和冬季初始运行两种方案的地埋管钻孔壁年平均温度与土壤初始温度相比,分别上升3.10和5.12℃,导致机组耗功率逐年增加,应考虑采用复合式地源热泵系统间歇运行或增设地埋管设置分区运行策略,平衡土壤传热量。
The ground heat transfer model and the system energy consumption model are established to simulate the operating characteristics of the GSHP under unbalanced hot and cold load. When the building air-conditioning cooling load is greater than the heat load, and the cooling time is longer, the ground source heat pump system from the initial operation of the winter to reach the summer time, the ground temperature than the initial operation of the summer low, more conducive to summer ground source heat pump system energy saving. After the ground-source heat pump system is operated for 7 years, the annual mean borehole temperature of the buried pipe wall increases by 3.10 ° C and 5.12 ° C respectively compared with the initial temperature of the soil when the summer and winter initial operation are adopted. As a result, the power consumption of the unit increases year by year. The use of composite ground source heat pump system intermittent operation or additional buried pipe to set sub-zone operation strategy to balance the soil heat transfer.