Theoretical Study on Performance of Cascade Air-source High Temperature Heat Pump Vapor System
Through the coupling of the cascade air-source high temperature heat pump system and the mechanical vapor compression system,a cascade air-source high temperature heat pump vapor system can not only effectively provide vapor to the industrial process,but also effectively reduce the ambient temperature.R410A and R245fa is used as the low-temperature cycle and high-temperature cycle working mediums,and R718 as the working medium of the mechanical vapor compression system.Liquid replenishment and water-injection cooling are used in the system to improve the system performance.The theoretical study shows that,when the condensing temperature of R245fa is constant,with the increase of the R410A condensing temperature,the heating capacity,cooling capacity,and power consumption of the system decrease,and the heating coefficient of performance(COP),cooling COP,and total COP first increase and then decrease.When the evaporation temperature is 20℃and the vapor saturation temperature is 160℃,the heating COP of the system is 1.49,and the total COP reaches 2.35.This shows that the performance of the system is far better than that of the electric boiler heating and air conditioning cooling respectively when realizing the double supply of cold and vapor,which help the energy saving and carbon reduction of the industrial field.
High temperature heat pumpVapor systemDouble supply of cold and vaporTheoretical research
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