在建筑空间调节蒸汽压缩循环提供冷却。工质通常是一种制冷剂，具有良好的热性能和传输性能，在空调应用中具有较高的容量，但如果发生泄漏，可能会对环境产生不利影响。节能和环保问题是高性能和环保型传热流体大量增长的核心原因。本文介绍了四种低全球变暖潜能（LGWP）制冷剂，即制冷剂R32（GWP）的热性能数据。 R1234yf（GWP.4）和两种新开发的制冷剂，GWP分别约为300和500。本研究中研究的液体替代了住宅空调应用中管道分离系统中的制冷剂R410A（GWP.2088）。本文详细讨论了COP、制冷量、制冷剂的热力循环特性，以及在大范围环境温度下的特性；尤其是在110°F和115°F（43°C和46°C）的极端高温条件下。与R410A相比，制冷剂R1234yf有一个有趣的行为。 这种制冷剂在温和的环境温度下COP稍低，但在较高的环境条件下COP较高。然而，通过采用相同的系统，R1234yf仅提供了交流机组标称容量的54%左右。R32的容量更高，COP与R410A相似，但其排放温度和压力明显更高。这两种新型制冷剂在循环压力和压缩机排气温度相似的情况下产生了良好的COP和冷却能力。DR- 4在高温环境条件下，必须仔细调整系统中的温度。通过对机组膨胀阀的微调，两种新型制冷剂的制冷循环得到了最佳控制，并进一步提高了容量和COP。引用:德克萨斯州达拉斯ASHRAE会议论文。

In building space conditioning vapor compression cycles provide cooling. The working fluid is often a refrigerant that has good thermal and transport properties and high volumetric capacity for AC applications, but it might have unfavorable effects on the environment in case of leakage. Energy conservation and environmental concerns are the core reasons for the tremendous growth of high performance and environmentally friendly heat transfer fluids. This paper presents data of the thermal performance of four Low Global Warming Potential (LGWP) refrigerants, that is, refrigerant R32 (GWP. 675), R1234yf (GWP. 4) and two new developmental refrigerants that have GWPs of about 300 and 500. The fluids investigated in this work replaced refrigerant R410A (GWP. 2088) in a ducted split system for residential air conditioning applications. The COPs, cooling capacities, refrigerants thermodynamic cycles characteristics are discussed in details in this paper and for a broad range of ambient temperatures; especially for extreme high temperature conditions of 110° and 115°F (43° and 46°C).Refrigerant R1234yf had an intriguing behavior when compared to R410A. This refrigerant had slightly lower COP at mild ambient temperatures but higher COPs at high ambient conditions. However, by adopting the same system, R1234yf provided only about 54% of the nominal capacity of the AC unit. R32 had a higher capacity and similar COPs as that of R410A but its discharge temperatures and pressures were significantly higher. The two novel developmental refrigerants yielded good COPs and cooling capacities with similar cycle pressures and compressor discharge temperatures. The charge of DR-4 in the system had to be carefully adjusted for the tests at high temperature ambient conditions. With minor adjustments of the expansion valve of the unit, the refrigeration cycles with the two new developmental refrigerants were optimally controlled and further improvements of the capacity and COPs were achieved.