压缩/喷射制冷循环中喷射器引射室的最优压降

建立了蒸气压缩/喷射制冷循环稳定运行时两相喷射器的热力学模型,以常压沸点相差较大的制冷剂为工质,比较了两相喷射器引射室压降最优范围的差异,并在同一工况下,研究了不同工质压缩/喷射制冷循环的性能。结果表明:喷射器引射室压降存在最佳范围使压缩/喷射制冷循环性能接近最优值;在相同工况下不同制冷工质这个最佳范围不相同;在同一工况下,当采用压缩/喷射制冷循环时,不同工质的循环性能系数和单位容积制冷能力相比基本循环均增强了。研究结果为压缩/喷射制冷循环制冷工质的选择及两相喷射器结构的优化设计提供理论参考。

The optimum pressure drop of ejector suction chamber in compression/ejection refrigeration cycle

The thermodynamic model of two-phase ejector was established when the vapor compression/ejection refrigeration cycle works in steady status.By using the model,the optimum ranges of ejector suction chamber pressure drop were studied for working fluids with different normal boiling points,and the compression/ejection refrigeration cycle performance for different refrigerants was compared at the same working condition.The results indicate that there exists the best range for ejector suction chamber pressure drop in which the refrigeration cycle can achieve a near optimum performance,and this best pressure drop range is different for different working fluid at the same working conditions.The COP and volumetric refrigeration capacity for various refrigerants are both improved when adopting the ejector cycle.