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首页> 外文期刊>Energy Conversion & Management >Nocturnal reverse flow in water-in-glass evacuated tube solar water heaters
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Nocturnal reverse flow in water-in-glass evacuated tube solar water heaters

机译：玻璃水真空管太阳能热水器的夜间回流

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In this work, the thermal performance of water-in-glass evacuated tube solar water heaters (SWH) at nights was experimentally investigated. Measurements at nights showed that the water temperature in solar tubes was always lower than that in the water tank but higher than the ambient air temperature and T_(exp), the temperature of water inside tubes predicted in the case of the water in tubes being naturally cooled without reverse flow. This signified that the reverse flow in the system occurred at nights, making the water in solar tubes higher than T_(exp). It is found that the reverse flow rate in the SWH, estimated based on temperature measurements of water in solar tubes, seemed not sensitive to the atmospheric clearness but sensitive to the collector tilt-angle, the larger the tilt-angle of the collector, the higher the reverse flow rate. Experimental results also showed that, the reverse flow in the SWH was much higher as compared to that in a thermosyphonic domestic solar water heater with flat-plate collectors, but the heat loss from collectors to the air due to reverse flow in SWHs was very small and only took about 8-10% of total heat loss of systems.
机译：在这项工作中，对玻璃水真空管式太阳能热水器（SWH）在夜间的热性能进行了实验研究。夜间测量表明，太阳能管中的水温始终低于水箱中的水温，但高于环境空气温度和T_（exp），如果管中的水自然，则预测管内的水温冷却，无逆流。这表明系统中的逆流发生在晚上，使太阳能管中的水高于T_（exp）。结果发现，根据太阳能管中水的温度测量值估算的SWH中的反向流速似乎对大气清洁度不敏感，但对收集器的倾斜角敏感，收集器的倾斜角越大，则对太阳能电池的逆流率越大。更高的反向流速。实验结果还表明，与带有平板集热器的热虹吸家用太阳能热水器相比，SWH中的逆流要高得多，但是由于SWH中的逆流，集热器向空气的热损失很小。仅消耗了系统总热量损失的8-10％。

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