CO2跨临界循环优化配置热力学分析

对7种CO2跨临界循环的性能进行了对比分析，结果表明，当膨胀机的效率达到60％时，TCDH循环的效率最高，是一种有发展前途的循环方式。对TCDH循环进行了结构配置优化分析，并与存在最佳高压压力时的循环进行了性能比较。可以发现，优化配置循环的COP低于最佳高压压力循环时的COP，当膨胀机的效率达到80％左右时，两者的COP才能够基本相当。所以在优化整个系统的结构设计时，应该权衡考虑各方面因素的影响。

Thermodynamic Analysis for Optimization Configuration of CO2 Transcritical Cycle

Performance for seven different types of CO2 transcritical cycles are analyzed and compared. The results show that the coefficient of performance of the TCDH cycle with expander efficiency achieving 60 % outperforms those of the other cycles at given conditions, which is a proposing cycle. And then, optimization configuration analysis for TCDH cycle is performed and the performance of this cycle is compared with that of the cycle possessing optimal heat rejection pressure. It is found that the COP of optimization configuration cycle is lower than that of the cycle possessing optimal heat rejection pressure. When the expander efficiency is 80 % or so, the COP of the two cycles can be at the same level.