摘要
通过对R404A/CO_2复叠制冷系统和R404A双级压缩制冷系统热力性能计算,分析这两种系统在蒸发温-30~-55℃下的COP、热力完善度的对比情况,以及冷凝温度对这两种循环的COP的影响,并说明了复叠循环的质量流量比随蒸发温度的变化。
Through calculating thermodynamic performance of R404A/CO_2 cascade system and R404 A double-stage system,the COP as well as thermodynamic perfectness of the two kind refrigeration systems is analyzed in the condition of evaporation temperature from-30℃ to-50 ℃.Besides,influence of condensed temperature on COP is also studied.And finally this paper illustrates the compact of evaporation temperature on the mass ratio of R404A/CO_2 cascade system.
引文
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