the connection 7 of the discharge unit is directly connected to the heat exchanger 8 also the heat exchanger 10 is connected to the discharge unit 1 only by the interposition of a waste gas heat exchanger 12 via a connection line 11 in the first heat exchanger 8 of the temperature exchanger 9 the weak solution which is at its highest temperature here is cooled down and is passed to an expansion valve 14 via a line 13 and from there via an intermediate heat exchanger 15 to an absorber 16 the absorber is followed by a collector 17 from where the rich cool solution is now passed to a pump 18 via the already mentioned intermediate heat exchanger 15 the pump 18 feeds the already preheated rich solution into the second heat exchanger 10 of the temperature exchanger 9 from where it is supplied again to the discharge unit 1 via the waste gas heat exchanger 12 as heated rich solution condensate which may possibly occur in the second heat exchanger 10 of the temperature exchanger 9 is directly supplied to the discharge unit 1 via a line 19 by passing the waste gas heat exchanger 12 the coolant vapor produced in the discharge unit is emitted via a connection 20 in the passage of which is connected a waste gas overheated heat exchanger 21 the high heated vapor is supplied to the heat exchanger 10 of the temperature exchanger 9 which it leaves in a direction towards a condenser 23 via a line 22 from the condenser 23 a line 24 leads to an aftercooler 25 from where the condensate is passed to a further expansion valve 27 via a line 26 the expansion valve.