替代高温气候区域分体式家用空调R22的低GWP制冷剂R444B实验研究

Experiment Study on R444B as an Alternative Low GWP Refrigerant of R22 Used in Room Air Conditioners in High Ambient Temperature Regions

制冷剂R444B是霍尼韦尔最新开发的、可作为高温气候区域家用空调制冷剂R22的替代制冷剂。R444B的ODP（臭氧消耗潜能值）为零,GWP（全球变暖潜能值）仅为295;相对于R22,GWP减少85%。理论制冷循环分析表明,R444B的制冷量和COP（性能系数）在高温工况下与R22相当。分体式空调实验结果显示：在高温气候区域的T3和T3Max工况下,R444B的制冷量和COP与R22相当,略高于R407C;R444B的排气温度与R22相当;R444B换热器压降也小于R22;R444B制冷剂流量约为R22的80%。通过优化室内机管路连接方式,优化后R444B空调制冷量和COP相对于原型提升0.3%~1.0%。R444B的制冷量和COP随高温环境衰变速率与R22相当,优于R407C。

Refrigerant R444B is developed by Honeywell as an alternative to R22 used in room air conditioners in high ambient temperature regions. R444B shows zero ODP （ozone depletion potential） and 295 GWP （global wanning potential）. Comparing with R22, GWP of R444B reduces 85%. Analysis on the theory refrigeration cycle at the condition of high ambient temperature shows the refi-igeration capacity and COP （coefficient of performance） of R444B are similar with that of R22. Experimental study on Mini-Split air conditioner under T3 and T3max shows that, the refrigeration capacity and COP of R444B are similar to those of R22, and are higher than those of R407C; the discharge temperature of R444B is similar to those of R22;the pressure drop of R444B in the heat exchanger is lower than that of R22. Comparing with the original one, the refi-igeration capacity and COP of the optimized R444B air conditioner can be increased by 0.3%~1.0% through optimization on the pipeline connection of indoor unit. The degradation of refrigeration capacity and COP ofR444B are similar to those of R22, and are better than those of R407C.