液氨喷射泵热力性能的计算分析OA北大核心CSTPCD

In order to ensure the normal operation of the refrigeration system with a falling-film evaporator,a liquid ammonia ejection pump is used as the circulating equipment for liquid ammonia in the evaporator.Based on the gas kinetic function method,the performance calculation program of the ejection pump is prepared,the thermal performance of the ejection pump in the refrigeration system is analyzed,and the influence of the operating parameters on the performance of the ejection pump is studied.The results show that,keeping the ejection pressure and outlet pressure unchanged,the higher the working fluid pressure,the larger the entrainment ratio;the lower the working fluid temperature,the smaller the entrainment ratio.Keeping the working pressure and outlet pressure unchanged,the higher the saturated ejection pressure is,the larger the entrainment ratio is,and the closer the value of the ejection pressure is to the value of the outlet pressure,the more significant the change of the entrainment ratio is.The saturated injection liquid ammonia pressure remains unchanged,and the closer the outlet pressure is to the injection liquid ammonia pressure,the more obvious the injection coefficient increases with the increase of the working liquid ammonia pressure.