Experimental Study Of A Combined Solar Ejection-compression And Ice-storage System

With energy conservation, to promote low carbon living increasingly become the subject of the society,the development and utilization of solar and other renewable energy have been paid more attention. The ejection refrigeration system can use solar energy for cooling. When solar radiation is poor,such as at a cloudy day or night, the system can not meet the building's cooling demand, but when the solar radiation is sufficiency, the solar radiation margin will appear surplus. To make the most use of solar energy, a combined solar ejection-compression refrigeration and ice storage system was studied in this dissertation.In order to study the new system, an experiment setup was built on the basis of the original solar ejection system, and other new related equipment was designed and selected again. The main research work are as follows:(1) Analysis the performance of the combined solar ejection-compression refrigeration system, The simulation data shows: the performance of the combined system is better than the solar ejection system and the compression system, and there is a temperature range make its performance best, when the condensing temperature at 35℃, the energy efficiency ratio (EER) attained optimum value when the intercooling temperature is from 5℃to 10℃;(2) The experiment setup was designed based on the thermomechanical analysis, the storage tank, intermediate heat exchangers, compressors and other equipment were design and selected, and the water system and data acquisition system for the beach was selected too. The experiment setup of the combined solar ejection-compression refrigeration and ice storage system was build; (3) The experimental results shows that: when the condensing temperature at 32℃, the middle temperature at 15℃,the evaporation temperature at -5℃, -10℃and -15℃, the EER and COP will first increases and then decreases with the generator temperature rising, the total power first decreases and then increases, its EER can get to 2.65 and COP can get to 0.155, the best generator temperature rage is from 76℃to 78℃; when the generator temperature are at 75℃, 80℃and 85℃, the condensing temperature is 35℃, the best intercooling temperature range is from 12℃to 15℃, the EER can get to 2.6, specific refrigerating effect can reach 1350W.The results show that: the combined solar ejection-compression refrigeration system can operate steadily, in the corresponding working conditions; it can meet the design requirements. Through the study, it was found that there is an optimal work area for the combined solar ejection-compression refrigeration system. In this region, the performance of the system has a better value, while the operation of the compressor in the combined system was further analyzed, which is beneficial for laying foundation for the further study to the system.