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采用引射器替代节流阀可以回收部分膨胀功,进而提高制冷循环的性能系数。针对R134a压缩/引射制冷循环建立了热力学模型,分析了冷凝温度、蒸发温度、引射器吸入压差以及引射器各段的效率对循环性能的影响。结果表明,在一定工况下存在最佳吸入压差使得循环COP达到最大值。常规空调工况下,采用引射器替代节流阀可使循环COP提高10%左右。提高引射器各段的效率,特别是扩散段的效率,可提高循环的性能。
The use of ejectors instead of throttles can recover part of the expansion work, thereby increasing the performance coefficient of the refrigeration cycle. A thermodynamic model was established for the R134a compression / injection refrigeration cycle, and the influence of condensation temperature, evaporation temperature, suction pressure difference of ejector and the efficiency of each section of ejector on cycle performance was analyzed. The results show that under the certain operating conditions, there exists the optimal suction pressure differential so that the circulating COP reaches its maximum value. Conventional air conditioning conditions, the use of ejectors to replace the throttle can make the cycle COP increased by about 10%. Improve the efficiency of each section of the ejector, especially the efficiency of the diffusion section can improve the performance of the cycle.