and recombined in the absorber with the low pressure refrigerant vapor exiting the evaporator application_number US 83247897 A description referring now to the drawings and particularly to fig1 an input line 10a of a pervaporation membrane separator unit 10 is connected to the output line 12a of an absorber 12 via pump 14 and a retentate heat exchanger 16 it should be noted that the heat exchanger 16 is not essential to the operation of a simplified system in accordance with our invention which increases the cop the absorber in combining the refrigerant vapor supplied via input line 12b with the liquid absorbent supplied via input line 12c generates heat which is removed by means of an internal heat exchange coil 12d heat exchange lines 12e and 12f are provided to conduct the heat exchange fluid through the coil 12d the output of the absorber on line 12a is a dilute solution of liquid rich refrigerant e g ammonia and the absorbent liquid e g water the pump 14 increases the pressure of this refrigerant absorbent solution from say about 10 15 psia at the output of the absorber to say about 200 to 350 psia at the input line 16a to the internal coil 16b of heat exchanger 16 the retentate heat exchanger 16 increases the temperature of the refrigerant absorbent solution as a result of the removal of heat from the concentrated absorbent liquid being returned from the separator output line 10c to the input 12c of the absorber via a pressure regulator 17 line 16c internal heat exchanger coil 16d line 16e and a restrictor element.