太阳能热水系统中蓄热水箱温度分层研究及发展趋势

太阳能热水系统中蓄热水箱合理的温度分层,一方面可以降低集热器进口温度,减少热量损失,提高集热器效率;另一方面可以提高储罐内可用能量,减少辅助热量,缩短系统从开启到有可用能的时间,从而提高可用能的品质,是提高太阳能热水系统性能的关键问题之一。目前实现水箱温度分层的主要方法有改进水箱内部结构和进出口结构两种。综合国内外文献,从太阳能储热水箱温度分层的研究现状和改进方法两个方面介绍并分析了蓄热水箱的内部结构、进口结构等因素对蓄热水箱温度分层的影响,并展望了温度分层型蓄热水箱的研究趋势。

Research and Development Trends of Temperature Stratified Storage Tank in Solar Water Heating Systems

Thermal straTified storage tank in Solar Water Heating Systems can decrease the inlet temperature of the collector so as to increase its efficiency and, on the other hand, decrease the periods of operation of the auxiliary energy supply. It is one of the key issues to improve the performance of the entire solar water heating system. Now the main methods of realization thermal stratification of a tank are the improvement of inner structure and inlet and outlet structure of the tank. The current status of the study and the improved method of a thermal stratified storage tank are introduced and analyzed, based on domestic and foreign literatures. The tendency of the thermal stratified storage tank for solar energy is prospected.