A comparative study on the environmental impact of supermarket refrigeration systems using low GWP refrigerants

Supermarket refrigeration systems have high environmental impact due to their large refrigerant charge and high leak rates. Consequently, the interest in using low GWP refrigerants such as carbon dioxide (CO₂) and new refrigerant blends is increasing. In this paper, an open-source Life Cycle Climate Performance (LCCP) framework is presented and used to compare the environmental impact of four supermarket refrigeration systems: a transcritical CO₂ booster system, a cascade CO₂/N-40 system, a combined secondary circuit with central DX N-40/L-40 system, and a baseline multiplex direct expansion system utilizing R-404A and N-40. The study is performed for different climates within the USA using EnergyPlus to simulate the systems' hourly performance. Further analyses are presented such as parametric, sensitivity, and uncertainty analyses to study the impact of different system parameters on the LCCP.     

LCCP,一种全球气候变暖影响的评价指标

介绍了几种对全球气候变暖影响的评价指标，包括全球变暖潜值GWP、变暖影响总当量TEWI及寿命期气候性能LCCP。特别讨论了LCCP概念的内涵，以及它与GWP和TEM之间的关联和区别。综合介绍了使用不同制冷剂时单元式空调、冷水机组、商业制冷、汽车空调及家用冰箱等制冷空调设备的LCCP典型结果。     

制冷剂R32在空调应用上的理论分析

从理论上对制冷剂R32的环保性、循环性能和安全性进行分析,得出R32在循环性能上与常用制冷剂相当,满足普通家用空调器使用安全要求,环保性优于常用制冷剂,因此对于常用制冷剂来说是一种可行性很高的替代品。