本文对不同结构的制冷系统进行了比较研究。该研究的主要重点是能源效率和TEWI的比较。通过仿真软件进行了研究。根据这项研究，使用天然制冷剂的合适系统配置不仅可以减少全球变暖的直接影响，还可以提高能源效率。该研究表明，与超市应用的两个独立R404A系统相比，NH3/CO2级联系统将始终具有优越的性能，而CO2增压系统在中冷气候下提供最佳效率。R290/CO2叶栅的性能与参考系统类似（未考虑热回收）。尽管真实系统数据很少，但现有研究证实了理论模拟。 引用:ASHRAE会议论文，蒙特利尔，QC

In this paper a comparative study of different configurations of refrigeration systems is presented. The main focus of the study is the comparison of energy efficiency and TEWI. The study was done by means of simulation software. According to the study a suitable system configuration with natural refrigerants not only reduces the direct global warming impact, but also improves energy efficiency. The study indicates that in comparison to two independent R404A systems for supermarket applications, an NH3/CO2 cascade system will always have superior performance, while a CO2 booster system provides best efficiency in moderate and cold climates. A R290/CO2 cascade has similar performance to the reference system (heatreclaimed not considered). Even though real system data are scarce, available studies confirm the theoretical simulations.