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自然循环式太阳热水器系统,由于它结构简单、运行可靠、维修方便且不需任何外来能源,目前在我国已逐渐推广使用并获得了较好的效果。如何更经济、合理地设计与使用这类太阳热水器开始为人们所重视。就系统设计而言,大家普遍关心的是集热器与贮水箱间的高差问题,都在探讨高差与系统热性能间的关系。有一些介绍太阳热水器的通俗读物及个别研究报告有这样的看法,即“增大贮水箱与集热器间的高差可使系统中的水循环流量加大,这样可从集热器中取出更多的有用热量,以提高太阳热水系统的热效率。”我们认为这种说法不够全面,对高差与系统热性能间的关系必须作具体深入地分析才能得出正确的结论。首先必须看到,水在太阳热水器系统中循环流动是由于系统中的
Natural circulation solar water heater system, because of its simple structure, reliable operation, easy maintenance and without any external energy, has been gradually promoted in our country and achieved good results. How to design and use this type of solar water heater more economically and reasonably has begun to attach importance to people. In terms of system design, everyone is generally concerned about the height difference between the collector and the storage tank, are talking about the relationship between elevation and system thermal performance. There are some popular books on solar water heaters and some studies have the opinion that “to increase the height difference between the water tank and the collector can increase the water circulation in the system, so that more can be removed from the collector More useful heat to increase the thermal efficiency of solar hot water systems. ”We think this is not comprehensive enough and the relationship between elevation and system thermal performance must be analyzed in detail to arrive at the correct conclusion. It must first be seen that the circulation of water in the solar water heater system is due to the system