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本文在各种CO_2跨临界单级压缩制冷循环的基础上,建立了6种CO_2跨临界双级压缩制冷循环系统的热力学模型,并对中间压力、蒸发温度、气体冷却器出口温度、高压级和低压级压缩机效率等设计参数对系统性能系数(COP)的影响进行了分析和比较。结果表明,气体冷却器出口温度和低压级压缩机效率是影响系统COP的主要因素。同时,通过对比6种型式的双级压缩系统,发现在给定的高压压力下,二次节流中间不完全冷却形式的双级压缩系统在系统的性能系数和安全运行方面在这些双级压缩系统中是最好的。这些研究成果可为CO_2跨临界双级压缩制冷系统的优化设计提供参考。
Based on the various transcritical single-stage compression refrigeration cycles with CO 2, six thermodynamic models of transcritical CO 2 transcritical refrigeration cycle are established. The influences of intermediate pressure, evaporation temperature, outlet temperature of gas cooler, The effects of design parameters such as compressor efficiency on the coefficient of performance (COP) of LP compressor were analyzed and compared. The results show that the outlet temperature of the gas cooler and the compressor efficiency at the low pressure stage are the main factors affecting the COP of the system. At the same time, by comparing the six types of two-stage compression system, it was found that under the given high pressure, the two-stage compression system in the form of secondary throttling intermediate incomplete cooling in the performance coefficient of the system and safe operation in these two-stage compression The system is the best. These research results can provide reference for the optimal design of transcritical CO_2 transcritical refrigeration system.