## 2006, (12) 62-65+55

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### CO_2跨临界膨胀机循环最佳高压压力计算Calculation of the Optimal Heat Rejection Pressure of CO_2 Transcritical Expander Cycle

#### 杨俊兰;马一太;曾宪阳;刘圣春;YANG Jun-lan~(1,2),MA Yi-tai~1,ZENG Xian-yang~1,LIU Sheng-chun~1(1.Tianjin University,Tianjin 300072,China;2.Tianjin Institute of Urban Construction,Tianjin 300384,China)

CO2跨临界制冷循环存在最佳高压压力,对应着最大COP。但是,膨胀机循环的最佳高压压力与节流阀循环的最佳高压压力不同。CO2膨胀机循环的最佳高压压力主要受压缩机效率、膨胀机效率、气体冷却器出口温度以及蒸发温度等参数的影响。当压缩机和膨胀机的效率一定时,CO2节流阀循环的最佳高压压力比膨胀机循环的高。为了计算方便,对膨胀机循环的最佳高压压力进行了计算和数据回归,并给出了计算关联式。
There is an optimal heat rejection pressure existing in the CO_2 transcritical refrigeration cycle that gives a maximum COP.Whereas,the optimal heat rejection pressure in the expander cycle is different from that of in the throttle valve cycle.The optimal heat rejection pressure in the CO_2 expander cycle mainly depends on the compressor efficiency,expander efficiency,the outlet temperature of the gas cooler and the evaporation temperature,etc.When the compressor and the expander efficiencies are given,the optimal heat rejection pressure in the CO_2 throttle valve cycle is greater than that of in the expander cycle.In order to calculate conveniently,the values of the optimal heat rejection pressure in the expander cycle are regressed,and a calculation correlation is obtained.

CO_2 transcritical cycle;expander;throttle valve;optimal heat rejection pressure

Abstract:

Keywords:

YANG Jun-lan~(1,2),MA Yi-tai~1,ZENG Xian-yang~1,LIU Sheng-chun~1(1.Tianjin University,Tianjin 300072,China;2.Tianjin Institute of Urban Construction,Tianjin 300384,China)