A comparison of coefficient of performance (COP) of the new double-effect NH3-H2O absorption cycle was made with those of for the traditional single-effect and doublestage cycles.

• 热泵蒸发温度与热水入口温度越高,产生适宜出口温度的热水流量调节范围越大,出口温度相同时则系统能效比越高;