带闪发器中间补气的R290热泵系统性能分析

Performance analysis of R290 vapor-injected heat pump system with flash tank

对以R290为工质的闪发器中间补气的高温热泵系统进行性能分析,得出:随补气前压力比增大,R290闪发器高温热泵系统的平衡补气压力增大,相对补气量减小,压缩机总功耗减小,系统制热量减小,压缩机排气温度升高。系统存在最佳补气前压力比,使系统获得最优的性能系数。蒸发温度为30 ℃、冷凝温度为85 ℃时,补气前压力比为1.5时获得最大性能系数3.61。随蒸发温度增加,平衡补气压力增加,相对补气量减小,压缩机总功耗增加,制热量增加,系统性能系数减小。随冷凝温度升高,相应平衡补气压力升高,相对补气量增大,压缩机总功耗减小,制热量减小,系统性能系数增加。在最佳补气前压力比为1.5工况下,与常规高温热泵系统比较,性能系数提高18.57%,压缩机排气温度下降10.03 ℃。研究结果为进一步开发R290为工质的闪发器中间补气的高温热泵系统提供理论基础。

The performance analysis of vapor-injected high temperature heat pump system with the flash tank using R290 as the working fluid shows that as the pressure ratio before vapor injection increases,the balanced vapor injection pressure of the R290 high temperature heat pump systems with flash tank increases,and the relative vapor injection volume decreases,the total power consumption of the compressor decreases,the system heating capacity decreases,and the compressor exhaust temperature increases.The system has an optimum pressure ratio before vapor injection,so that the system can obtain the best performance coefficient.When the evaporation temperature is 30 ℃,the condensation temperature is 85 ℃ and the optimum pressure ratio beforevapor injection is 1.5,the maximum coefficient of performance is 3.61.With the increase of evaporation temperature,the equilibrium vapor injection pressure increases,the relative vapor injection volume decreases,the total power consumption of the compressor increases,the heating capacity increases,and the system performance coefficient decreases.With the increase of condensation temperature,the corresponding balanced vapor injection pressure increases,the relative vapor injection volume increases,the total power consumption of the compressor decreases,the heating capacity decreases,and the system performance coefficient increases.Compared with the conventional high temperature heat pump system under the working conditions with the optimal pressure ratio of 1.5 before vapor injection,the coefficient of performance is increased by 18.57%,and the compressor exhaust temperature is reduced by 10.03 ℃.The research results provide a theoretical basis for further developing the vapor-injected high temperature R290 heat pump system with the flash tank.