摘要
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 CO2 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 CO2 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 CO2 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.
出处
《流体机械》
CSCD
北大核心
2006年第12期62-65,55,共5页
Fluid Machinery
基金
国家自然科学基金项目(506476064)
关键词
CO2跨临界循环
膨胀机
节流阀
最佳高压压力
CO2 transcritical cycle
expander
throttle valve
optimal heat rejection pressure
