跨临界CO2制冷循环(火用)分析

摘要

The loss exergy and its exergy efficiency of trans - critical CO2 cycle were analyzed based on thermodynamic secondly principle. The results showed that the loss exery was maximum during throttling and exergy efficiency of cycle was only 25% . Increasing evaporation temperature and decreasing the end temperature of cooling were effective ways to improve the exergy efficiency of cycle. Rising cooling pressure can lowering exergy loss of throttling, but had little effect on the exergy efficiency of cycle.%基于热力学第二定律,对跨临界CO2制冷循环过程的损失及(火用)效率进行理论分析,发现节流过程(火用)损失最大,循环(火用)效率为25％.提高蒸发温度和降低冷却终了温度是提高循环(火用)效率的有效途径；升高冷却压力,可以降低节流过程(火用)损失,但是对循环(火用)效率影响不大.