An ideal process model based on real solution for absorption heat pump is obtained in this paper. First

temperature lift factor is derived for real solution with infinite solution flow rate

and a correction factor kr is used to consider the difference with ideal solution

which is mainly dependent on the activity coefficient of solution in the generator and the absorber. For absorption heat pump

kr is higher than 1 and the COP is lower than that with ideal solution; for absorption heat transformer

kr is lower than 1 and the COP is higher than that with ideal solution. Then for real solution with finite flow rate

temperature lifting factor is defined and compared with solution of infinite flow rate. The correction factor kr is lower for real solution with finite flow rate and influenced by the concentration difference of solution

and the higher the concentration difference

the lower the kr. The COP for solution with finite solution flow rate is lower than the COP with infinite solution flow rate. Whatever the flow rate of real solution is infinite or finite

it always meets thatφCOP1