CO_2跨临界压缩式制冷循环理论分析

环保工质CO_2作为制冷剂用于空调领域再次受到广泛关注。文中对CO_2跨临界循环进行了热力学理论分析,分析结果表明:循环系统存在最优高压压力,使得其COP达到最大值;蒸发温度的升高或者冷却压力的降低都能提高COP,但都会降低效率;实际运行系统中,应该尽可能提高蒸发温度或者降低气体冷却器的出口温度。

Theory Analysis on the CO2Trans-critical Compression Refrigeration Cycle

As an environment-friendly refrigerant,CO2 has been paid a lot of attention again in the area of air-conditioning nowadays.In this paper,the CO2 trans-critical refrigeration cycle was analyzed thermodynamically. It was found:there is an optimal discharge pressure at which COP reaches maximum;It is useful to enhance COP for cycles by increasing the evaporation temperature or decreasing the cooling pressure,though the exergy efficiency is reduced;In the practical working system,the outlet temperature of the gas cooler should be de-creased as much as possible,or increase the evaporator temperature.