Thermodynamic Comparison Analysis on CO2 Transcritical Reverse Cycles with IHX or Expander

编号 zgly0000376668

文献类型 期刊论文

文献题名 Thermodynamic Comparison Analysis on CO2 Transcritical Reverse Cycles with IHX or Expander

作者 管海清  马一太  杨俊兰  李敏霞 

作者单位 SchoolofMechanicalEngineering 

母体文献 Transactions of Tianjin University;天津大学学报: 英文版 

年卷期 2005,11(2)

页码 110-114

年份 2005 

分类号 X511 

关键词 热力学  比较分析法  二氧化碳  碳氟化合物  大气污染  环境保护  全球变暖 

文摘内容 To improve the coefficient of performance (COP) of CO2 transcritical reverse cycle and determine the most efficient cycle, comparison analysis on single-and two-stage CO2 transcritical cycles with internal heat exchanger (IHX) or expander is presented adopting the principle of thermodynamics. Results indicate that the COP of four cycles, namely single-stage compression with IHX (SI), single-stage compression with expander (SE), two-stage compression with IHX (TI) and two-stage compression with expander ( TE), can be ranged as TE > SE > TI > SI. It presents that adopting an expander to recover expansion power is the primary method to improve the COP of CO2 transcritical reverse cycle if the efficiency of the expander is up to a certain value. Under supposed operating condition, where the outlet temperature of gas cooler is 35 ℃ and the evaporatingtemperature is 5 ℃, the COP of TE cycle is about 42% higher than that of SI cycle when the expander efficiency is 0.6, and the degree of superheat of IHX is 15 ℃. Therefore TE cycle is the most recommendatory one and it is better to adopt TE in those high-cooling capacity systems because its technology cost will be higher。