CO_2跨临界两级压缩及膨胀机循环的性能分析  

Performance Analysis of Transcritical CO_2 Two-Stage Compression and Expander Cycle

作　　者：杨俊兰[1] 马一太[1] 李敏霞[1] 管海清[1] 李丽新[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《天津大学学报》2005年第11期996-1000,共5页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(50476060).

摘　　要：为了提高CO2跨临界制冷系统的性能,建立了单级膨胀机循环与4种不带膨胀机的两级压缩循环的数学 模型,并进行了性能计算．结果显示,当膨胀机的效率达到60％时,在给定的气体冷却器出口温度以及蒸发温度范 围内(低于-10 ℃时除外),单级膨胀机循环的性能系数高于两级压缩循环的性能系数．当蒸发温度低于-10℃ 时,带中冷器的两级循环的性能占优势．另外,4种两级压缩循环的排气温度都低于单级膨胀机循环的排气温度．In order to improve the performance of the transcritical CO2-refrigeration system, the mathematical models for the single-stage expander cycle and for four types of two-stage compression cycles without expanders were developed and their performance was analyzed. The results showed that the coefficient of the performance of the single-stage expander cycle, when its expander efficiency achieving 60%, was higher than the coefficients of the four two-stage compression cycles within certain ranges of the gas cooler outlet temperatures and the evaporation temperatures （except those less than -10 ℃ ）. When the evaporation temperature was less than -10 ℃, the two-stage cycle with inter-cooler（IC） outperformed the other options. In addition, the discharge temperatures of the four two-stage compression cycles were lower than the temperature of the single-stage expander cycle.

关 键 词：CO2跨临界循环 性能提高 膨胀机 两级压缩 

分 类 号：TB61[一般工业技术—制冷工程]