【摘要】 提出一种新的蒸气压缩/喷射混合制冷循环,采用喷射器代替节流阀,以回收膨胀过程中的一部分动能,降低压缩机工作压比,达到节能的目的.针对这种新的循环进行了理论分析和计算,并与相同工况下的简单蒸气压缩制冷循环进行比较,讨论了喷射器喷射系数及其效率对循环性能的影响.计算结果表明,新循环能有效地提高跨临界CO2系统的性能.更多还原

【Abstract】 A new vapor-compression/ejection hybrid refrigeration cycle was proposed. In the new cycle, an ejector was used to replace the throttling valve to recover some of the kinetic energy of the expansion process. The compress ratio of compressor was also reduced, and then the cycle performance was improved. The theoretical analysis and simulation of the new cycle were carried out. The comparison between the new cycle and the standard vapor-compression cycle was made under the same operating conditions. The effects of ejector entrainment ratio and efficiency on the cycle performance were also discussed. The results indicate that the new cycle effectively improves the trans-critical CO2 cycle performance.更多还原