宽工况下水蒸气喷射制冷系统试验研究OA北大核心CSTPCD

In response to the instability of the heat load of low-grade waste heat resources,the change law of the performance of water vapor injection refrigeration system utilizing low-grade waste heat resources was studied.The ejecting coefficient of the steam ejector and the system performance were experimentally investigated by building an experimental platform for water vapor injection refrigeration.The results show that when the generation temperature is the design temperature of 140℃,the ejection coefficient of the steam ejector and system performance are the best,which are 0.34 and 0.33,respectively,and when the generation temperature is higher than the design temperature,the system performance and ejecting coefficient of the steam ejector are better than those when the generation temperature is lower than the design temperature;As the evaporation temperature increases from 2℃to 22℃,the ejecting coefficient of the steam ejector increases from 0.17 to 0.22,a 25%increase,and the system performance increases from 0.17 to 0.24,a 41%improvement,so higher evaporation temperatures improve the performance of the system;There is a critical condensation temperature,when it is exceeded,the ejecting coefficient of the steam ejector and the performance of the system decrease sharply.The research results provide experimental validation for the simulation study of water vapor injection refrigeration,which is of important significance for the optimization of steam injection refrigeration systems.