Abstract The refrigerant R32 has been receiving significant attention as an alternative to R410A used in heat pumps, owing to its lower global warming potential. The two-phase injection (TPI) technique is introduced to achieve improved energy performance along with high system reliability in R32 heat pumps, owing to their high discharge temperature. The objectives of this study are to compare the performances as well as reliabilities of the R32 and R410A TPI heat pumps and provide the design guidelines for achieving the best performance with safe operation. The performances of the R32 and R410A TPI heat pumps are measured by varying compressor frequency and outdoor temperature. The TPI technique enables the R32 heat pump to operate at a higher compressor frequency under severe weather conditions. At low outdoor temperatures of −10 °C and −15 °C, the R32 TPI heat pump demonstrates a superior heating capacity and coefficient of performance (COP) compared with the R410A TPI heat pump. In addition, the injection parameters in the R32 TPI heat pump are optimized under various operating conditions.

中文翻译：

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采用低GWP制冷剂R32的两相喷射热泵在室外各种工况下的能效评价

摘要 制冷剂 R32 作为热泵中使用的 R410A 的替代品，由于其较低的全球变暖潜势而备受关注。引入两相喷射 (TPI) 技术是为了在 R32 热泵中实现更高的能源性能以及高系统可靠性，因为它们的排放温度高。本研究的目的是比较 R32 和 R410A TPI 热泵的性能和可靠性，并为在安全运行的情况下实现最佳性能提供设计指南。R32 和 R410A TPI 热泵的性能通过改变压缩机频率和室外温度来测量。TPI 技术使 R32 热泵能够在恶劣天气条件下以更高的压缩机频率运行。在 -10 °C 和 -15 °C 的低室外温度下，与 R410A TPI 热泵相比，R32 TPI 热泵表现出卓越的制热能力和性能系数 (COP)。此外，R32 TPI 热泵中的喷射参数在各种工况下进行了优化。