上循环管位置对平板型家用太阳能热水器性能的影响

对一种常见的平板型立式储热水箱家用太阳能热水器进行试验分析.搭建了自然循环平板型家用太阳能热水器的实验平台.测量了两种不同位置的上循环管对白天加热阶段储热水箱温度变化及对热性能的影响,通过测试数据分析对比了高、低位上循环管循环时,水箱内温度变化、分层状况,定义了十分钟内的平均效率,并进行了比较.结果表明:储热水箱升温阶段采用高位上循环管的水箱内部出现较好的水温分层;高位上循环管热水器的自然循环瞬时效率比低位上循环管热水器的瞬时效率高.

Effect of Position of Upper Connecting Pipe on the Tank on Thermal Performance of Domestic Solar Water Heaters with a Vertical Storage Tank and Flat-plate Collectors

In this paper,the domestic solar water heater with a vertical storage tank and a flatplat collector,which is commercially available and popular in the market,was experimentally investigated. Firstly, natural circulation experiment platform of flat plate domestic solar water heater was set up. The effect of two different positions of upper connecting pipe on temperature variation in the water tank during the heating stage in the daytime and thermal performances was measured. Through the analysis of test data, The difference of temperature stratification in the water tank with upper connecting pipe at high position and at low position were studied re- spectively. Also the instantaneous efficiency in 10 minutes was defined and compared. The results showed that there was better temperature stratification in the water tank when it＇s upper connecting pipe at high position during heating stage. In addition, the instantaneous efficiency of solar water heater,which water tank with upper connecting pipe at high location under the natural circulation condition was superior to the water tank with upper circulation pipe at low position.