To improve the efficiency of a cold use-side device by lowering a temperature of a cooled fluid at an outlet of an evaporator to a limit while preventing the freezing of a refrigerant, in an absorption type refrigerating device driven by the exhaust heat of an engine by lowering the temperature of the cooled fluid at the outlet of the evaporator to the limit while preventing the freezing of the refrigerant.

In this exhaust heat-driven absorption type refrigerating device, a refrigerating capacity is controlled by changing a temperature of a supercooled solution flowing to an absorber and/or a flow rate of the supercooled solution, the flow of the refrigerant to the evaporator is stopped when the temperature of the cooled fluid at the outlet of the evaporator reaches a prescribed temperature or lower, the refrigerant is allowed to flow into the evaporator when the temperature reaches the prescribed temperature or higher, and the refrigerant directly flows to a dilute solution reservoir at a lower portion of the absorber during the stop of the flow of the refrigerant. According to this constitution, the temperature of the cooled fluid can be lowered to the limit and the performance of the cold use-side device can be improved to the maximum while preventing the freezing of the refrigerant.

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