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 conven-tional natural circulation system,the PV DC pump reduced the daily useful heat gain of the solar water heating system by 0.77 MJ/m2,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 ℃.
关键词
光伏直流水泵/太阳能热水器/热性能/运行特性
Key words
Photovoltaic DC water pump/Solar water heating system/Thermal performance/Operating characteristics
维普
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