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根据天津地区的气候条件,建立了太阳能-地源热泵多热源供热系统模型。利用TRNSYS软件对该系统进行了模拟研究,分析了系统用能情况及运行过程中地温的变化,着重对运行策略进行了研究。基于系统的性能系数选定的控制策略为:集热器出口与水箱出口温差大于15℃时启动集热,当温差小于2℃时停止集热;水箱出口温度高于50℃时启动储热,土壤进出口水温差不足5℃时停止储热。
According to the climatic conditions in Tianjin, a solar-ground source heat pump multi-heat source heating system model was established. The system is simulated by TRNSYS software, the energy consumption of the system and the change of ground temperature during operation are analyzed, and the operation strategy is studied emphatically. The control strategy selected based on the coefficient of performance of the system is as follows: the collector is started when the temperature difference between the outlet of the collector and the outlet of the water tank is greater than 15 ° C., and the collector is stopped when the temperature difference is less than 2 ° C. When the outlet temperature of the water tank is higher than 50 ° C., Soil temperature difference between import and export of water to stop the heat storage 5 ℃.