IMPROVMENT ON THE PERFORMANCE OF DOUBLE ABSORPTION HEAT TRANSFORMER BY ADOPTING A NEW SOLUTION CYCLE AND TWO SOLUTION HEAT EXCHANGERS

摘要

The thermodynamic performance of double absorption heat transformer with new solution cycle and two solution heat exchangers is simulated based on the thermodynamic properties of aqueous solution of lithium bromide in this paper. The results show that compared with the common solution cycle reported in the literatures the COP and the heat released in the absorber for per unit mass refrigerant leaving the generator can be increased respectively 25% and 34% by adding the solution heat exchanger between the absorbing evaporator and generator when the temperature lift is 100□. The effect of this added solution heat exchanger on the performance of DAHT with new solution cycle will gradually become large with the increase of absorbing temperature or absorbing evaporator temperature. In addition, the operating range of the temperature of the absorbing evaporator is also larger than that of common cycle. these characteristics make the system's operation more stable and system's control easier.