Refrigerating medium R22 and R134a are applied in household heat pump water heater in this experiment. The heating result and COP are researched and discussed by contrast.

• 本实验分别用R22和R134a作为家用热泵热水器的制冷工质,对比分析讨论和实验研究了其加热效果和性能系数,结果表明:R134a系统将90L来流水加热到50℃需要多于实验R22热泵热水器系统40min;