由于二氧化碳的全球变暖潜能（GWP）较低，使用二氧化碳（CO²）作为制冷剂的制冷系统，无论是在亚临界或跨临界循环中，还是作为二次冷却剂系统，最近都受到了相当大的关注。本文对各种CO²跨临界制冷系统进行了比较分析，以优化这些系统的运行参数。此外，还将选定的基于一氧化碳的制冷系统的性能与基准R进行了比较- 404在美国八个气候区的16个城市中使用bin分析的多路直接扩展系统。本研究中考虑的运行参数包括环境温度、吸入管换热器（SLHX）效率和蒸发器过热。引用:ASHRAE论文CD:2014 ASHRAE冬季会议，纽约

Refrigeration systems using carbon dioxide (CO2) as a refrigerant, either in subcritical or transcritical cycles, or as secondary coolant systems, have recently received considerable attention due to carbon dioxide's low Global Warming Potential (GWP). This paper presents a comparative analysis of various CO2transcritical refrigeration systems to optimize the operating parameters of these systems. In addition, the performance of selected CO2-based refrigeration systems is compared to the baseline R-404A multiplex direct expansion system using bin analyses in sixteen cities from eight climate zones of the United States. The operating parameters considered in this study include ambient temperature, suction line heat exchanger (SLHX) effectiveness and evaporator superheat.