Absorption refrigerating machine

PROBLEM TO BE SOLVED : To improve the efficiency of a double effect absorption type refrigerating cycle. SOLUTION : An evaporator 11 and an absorber 12 are arranged in a plurality of stages to change the evaporation temperature of water being a refrigerant. An absorber 12b on the low pressure side is charged with a high concentration absorbing solution and an evaporation pressure in an evaporator 11b on the low pressure side communicated therewith is reduced. The absorbing solution is further absorbed by an absorber 12a on the high pressure side to produce a rare absorbing solution which is returned to a high temperature generator 13 by an absorbing solution pump 17. A rare absorbing solution line 21 is a part between low and high temperature solution heat-exchanger 18 and 19 and branched into a branch pipe 23. Since a part of the rare absorbing solution is charged directly in the low temperature generator 14 for concentration, heat energy required for heating of a low temperature absorbing solution by the high temperature generator 13 is saved.