【摘要】 介绍了二氧化碳的热物理特性,理论分析了二氧化碳跨临界循环。在讨论基本理论循环的基础上,研究了带回热器的循环、带膨胀机的循环、既带回热器又带膨胀机的循环。同时,比较了各种循环的性能系数,发现在各种循环中都存在一个最佳的排气压力使得系统的性能系数达到最大值,并且带膨胀机的循环是性能系数最优的循环。更多还原

【Abstract】 In this paper,thermo-physical properties of CO2 were introduced and CO2 trans-critical theory cycle was analyzed.On the base of analyzing theory cycle,other cycles with regenerator or expander or both regenerator and expander was in detail researched.By comparing coefficient of performance of each cycle,it was found that coefficient of performance is maximal when discharge pressure is an optimal value,and the cycle with expander is optimum cycle in the all cycles.更多还原