Abstract

Wickless loop thermosyphon solar water heating (LT-SWH) systems, which working under the passive and active cycle modes, were designed and experimental setup, systems’ performance were comparative studied. The results showed that pump made the active cycle system overcharged, a small hydraulic head was observed most of time; because of that, there was a worse photothermal performance under the active cycle mode, no matter in the comparison of the instantaneous photothermal efficiency or the collector and system performance linear fitting; at the same time, there was also a worse isothermality of the solar evaporator under the active cycle mode.

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