Abstract: In this paper, a new type of cage drawer phase change heat storage tank is introduced. The phase change heat storage tank and ordinary heat storage tank are compared and analyzed through experimental tests on their solar energy guarantee rate and system energy efficiency ratio. The experimental results show that the hourly heat collection with the phase change heat storage tank is 3.7 times of that with the ordinary heat storage tank at the same tank size. The phase change heat storage water tank is beneficial to improve the solar energy guarantee rate and the energy efficiency ratio of the system. When the solar radiation intensity is similar, the phase change heat storage tank will increase the solar energy guarantee rate by 72% on average and increase the energy efficiency of the system by 26% compared with the average EER. At the same time, the phase change heat storage tank can reduce the heat loss in the upper part of the water tank at night, and the water temperature drop in the upper part of the water tank can be reduced by 50%.

Key words: phase change heat storage tank, solar energy combination system, solar energy guarantee rate, system energy efficiency ratio, collecting heat