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对天然工质二氧化碳( R744) 制冷循环的基本形式进行了分析计算。过冷或回热可以大幅度地改善亚临界循环和跨临界循环的性能系数,其理论循环的 C O P 增加速度远远超过其它工质。指出增加过冷度和回热度是二氧化碳制冷投入实践运行的重要手段。
The basic form of refrigeration cycle of natural refrigerants of carbon dioxide (R744) was analyzed and calculated. Undercooling or reheating can greatly improve the performance coefficient of subcritical and transcritical cycles, and the theoretical cycle of C O P increases much faster than other working fluids. It is pointed out that increasing the degree of subcooling and recuperation is an important means to put carbon dioxide refrigeration into practical operation.