Solar hot water systems have developed rapidly in recent years. There are lots of problems in the long term monitoring data onto solar hot water systems, which is difficult to learn the realistic effect of solar hot water systems. This paper studies the temperature monitoring data onto the related projects of solar hot water systems, and set up a set of evaluation system for solar hot water systems in order to evaluate the performance of solar hot water systems in realistic operation. Through comprehensive assessment of annual operation efficiency of solar water heating system, the annual COPs is about 1.5, the COPs of some projects is less than 1.35.
Keywords Solar hot water, evaluation indicator, hot summer and cold winter area, measured data