| 摘要 |
PROBLEM TO BE SOLVED: To keep the concentration of mixture refrigerant at a constant level and to prevent it from being varied due to scattering of solution or mixture refrigerant by providing means for controlling the flow rate of absorption solution based on a signal from means for detecting the concentration of mixture refrigerant and a controller for controlling the flow rate control means. SOLUTION: Absorption liquid is introduced from the delivery side of the spray pump 6B for a second absorber 4B into the mixture refrigerant tank 8B of a second evaporator 3B through piping 9 provided with an on/off valve 17 and mixture refrigerant is introduced from the second evaporator 3B to the suction side of a solution circulation pump 6B provided with a second absorber 4B through piping 15 provided with an on/off valve 16. The on/off valves 16, 17 are controlled as a flow rate control means for absorption solution and a flow rate control means for mixture refrigerant by means of a controller 21 based on the detection value of means 30 for detecting the concentration of mixture refrigerant. Consequently, the concentration of mixture refrigerant is kept at a constant level and prevented from being varied due to scattering of solution or mixture refrigerant.
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