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通过对太阳能辅助地源热泵系统热泵两循环侧进出口流体温度、流量以及钻孔内各深度土壤温度进行实时监测,评价系统供热性能(COPs)及土壤温度变化规律。2009年冬季系统实际供热运行结果显示,COPs在3.0～4.9,太阳能的辅助作用直接体现在土壤温度的变化上,使用太阳能辅助9d后,各深度土壤温度比不使用时平均高1.15℃,COPs提高0.20～0.25;经实测,太阳能对末端供热的能量贡献占总量的6.83%,土壤占56.30%,电能占36.87%。从两循环侧流体不同流速组成与系统性能的关系中,可知存在高效流量组合使给定系统在其他条件不变时,COPs达到最大,本系统的最优流量组合为(1.83,2.54)m3/h。
Through the real-time monitoring of the fluid temperature and flow at the inlet and outlet of the two circulating sides of the solar assisted ground-source heat pump system heat pump and the depth soil temperature in the borehole, the heating performance of the system (COPs) and the law of soil temperature change were evaluated. The result of actual heating operation in winter 2009 showed that the COPs ranged from 3.0 to 4.9. The auxiliary effect of solar energy was directly reflected in the change of soil temperature. After using solar energy for 9 days, the average soil temperature in each depth was 1.15 ℃ higher than that of non-use, COPs Increase by 0.20 ~ 0.25. After measured, solar energy contributes 6.83% of the total energy of the terminal heating, soil accounts for 56.30% and electric energy accounts for 36.87%. From the relationship between the different flow rates and the system performance of the two circulating fluids, it can be seen that the COPs reach the maximum when the other conditions are constant, and the optimal flow combination of this system is (1.83,2.54) m3 / h