水箱高度对太阳能热水系统效率的影响研究

Effect of the Position of Storage Can on Heat Exchange Efficiency in Solar Heating Water System

在自然循环太阳能热水系统中,储水箱与集热板位置间存在的高差是整个系统循环动力的关键因素。本文通过实验进一步研究了储水箱与集热板高差对自然循环太阳能热水系统效率的影响。实验中,通过改变储水箱高度,得到了不同高差条件下系统得热量与太阳辐照量的关系,同时得到热水系统的效率平均值分别为:23%、31%、23%、21%。当集热器顶部与储热水箱底部之间高差为86cm时平板式太阳能系统的热性能最好。

The height difference of collector and storage is the driving force of natural circulation system. The height difference have effect on water temperature of inlet and outlet of the collector. In order to study the impact of height difference on the system performance, experimental tests with four kinds of elevation, 116 cm, 86 cm, 56 cm, 36 cm were applied to study the solar system performance. The test for each height difference were carried out independently. Each height corresponding to the average efficiency of the system are as follows： 23%, 31%, 23%, 21%. It was concluded that the best performance was achieved when storage can is 86 cm over the collector.