一种带光伏直流水泵的太阳能热水器热性能研究

Study on Thermal Performance of a Solar Water Heater with Photovoltaic DC Water Pump

对一套安装光伏直流水泵的横双排分离式全玻璃真空管太阳能热水系统的热性能进行试验,分析了光伏直流水泵对太阳能热水器热性能的影响.结果表明,与常规的自然循环系统相比,光伏直流水泵会使太阳能热水系统的日有用得热量减少0.77 MJ/m^(2),热效率降低4.5%,但贮热水箱内水温分布较均匀,贮热水箱上、下层热水的平均温差仅为1.46℃.

A set of horizontal double-row separated all-glass evacuated tube solar water heating system installed with photovoltaic DC pump was tested to study and analyze the effect of photovoltaic DC pump on the thermal performance of the system.The results showed that,compared with the conventional natural circulation system,the PV DC pump reduced the daily useful heat gain of the solar water heating system by 0.77 MJ/m^(2),and the thermal efficiency was reduced by 4.5%,but the distribution of the water temperature in the water storage tank was more uniform,and the average temperature difference between the upper and lower hot water storage tanks was only 1.46℃.