摘要】 建立了可精确预测喷射器性能的热力学模型,对适用于低温热驱动的喷射制冷系统的环境友好工质进行了选择和计算分析。结果表明:R152a和R134a用于低温热驱动喷射制冷系统均能获得较好的制冷性能,在相同工况下,以R152a为工质的制冷系统的COP比R134a为工质的制冷系统的COP高4%—13.3%,采用R152a可获得更好的制冷效果。
【英文摘要】 A thermodynamic model used for accurate predicting the performance of an ejector was proposed.The model was then validated and applied to predict the performance of the ejector refrigeration system driven by low temperature heat using various environment friendly refrigerants.Results indicate that good performance can be obtained when applying R152a and R134a as the working fluid.Under the same operation conditions,the system performance using R152a is 4%—13.3% higher than that using R134a,which means R152a...