Temperature control system for absorption refrigerating apparatus

There is disclosed a temperature control system for an absorption refrigerating apparatus comprising an evaporator, an absorber, a condenser, a regenerator, a solution heat exchanger, a solution pump, a cooling medium pump, and piping operatively connecting these parts together. Where absorption refrigerating machines are arranged in two or more stages with respect to the flow of cold water to be circulated at a load side, the machine of each stage has a cold water outlet temperature detector, and a temperature controller for controlling the amount of heat of a machine-driving heated fluid in accordance with the cold water outlet temperature of each stage. A control circuit is so arranged that the temperature controller of the first stage, or the temperature controllers of the intermediate stages except for the temperature controller of the final stage are controlled by a proportional control whereas the temperature controller of the final stage is controlled by a PID control. Where the absorption refrigerating machine is provided in a single stage, the temperature control system comprises a proportional controller which detects an inlet temperature or an intermediate path temperature of the cold water so as to control the refrigerating machine, and a PID controller which detects an outlet temperature of the cold water so as to control the refrigerating machine.