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首页> 外文会议>Asia-Pacific Power and Energy Engineering Conference;APPEEC >On the Suitability of Test Method of GB/T 18708 for Water-in-Glass Evacuated Tube Solar Water Heaters
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On the Suitability of Test Method of GB/T 18708 for Water-in-Glass Evacuated Tube Solar Water Heaters

机译：GB / T 18708试验方法对玻璃水抽真空管式太阳能热水器适用性的探讨

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摘要

The thermal performance of water-in-glass evacuated tube solar water heaters is evaluated based on the daily radiation on the collector surface instead of the daily radiation actually received by a solar tube array, as described by test method of GB/T 18708 (eqv. ISO 9459-2). However, the daily radiation actually received by a solar tube array is quite different from that on the collector surface and strongly dependent on its structural and installing parameters. To assess the suitablity of the said test standard, a sensitivity analysis on the ratio of daily beam radiation actually received by a south-north oriented solar tube array to that by the collector surface, Rb,t-s, was performed based on the radiation predicted under clear sky condition. Results show that Rb,t-s, is strongly dependent on the distance between two adjacent tubes, implying that the testing result of thermal performance based on the test standard of GB/T 18708 is not of comparability for water-in-glass evacuated tube solar water heaters with different tube distance, and a further modification is necessary to essure test results comparable. Results also indicate that Rb,t-s is less sensitive on the tilt and azimuth angles of the collector for the case of and .
机译：如GB / T 18708（eqv）的测试方法所述，玻璃集水真空管太阳能热水器的热性能是根据集热器表面的日辐射量而不是太阳能管阵列实际接收到的日辐射量来评估的（ISO 9459-2）。但是，太阳能管阵列实际接收的日辐射与集热器表面的日辐射有很大不同，并且很大程度上取决于其结构和安装参数。为了评估所述测试标准的适用性，基于在以下条件下预测的辐射，对南北向太阳能管阵列实际接收的日束辐射与集热器表面的日束辐射之比Rb，ts进行了敏感性分析。晴朗的天空条件。结果表明，Rb，ts很大程度上取决于两个相邻管之间的距离，这意味着根据GB / T 18708的测试标准进行的热性能测试结果与玻璃水抽真空管太阳能水不可比。加热器具有不同的管距，必须进行进一步的修改以确保测试结果具有可比性。结果还表明，对于和，Rb，t-s对收集器的倾斜角和方位角不敏感。

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