PURPOSE: To provide a dual-effect absorption refrigerator which can be efficiently operated in response to change in a chilled water load by controlling the solution circulating amounts of a high-temperature regenerator and a low-temperature regenerator.

CONSTITUTION: A dual-effect absorption refrigerator has an absorber A, an evaporator E, a high-temperature regenerator GH, a low-temperature regenerator GL, a condenser C, a high-temperature heat exchanger XH, a low-temperature heat exchanger XL, solution routes 1-10, refrigerant routes 11-15 and a chilled water route 19 in such a manner that the high- temperature regenerator has a heat source heat quantity regulator 26 for regulating heat source heat quantity to the high-temperature regenerator according to a chilled water load signal or a chilled water temperature signal 23 of the chilled water route, and comprises a high head pump PH which can vary the number of revolutions and is disposed in the route 1 from the absorber to the high-temperature regenerator, and a high-temperature regenerator circulating amount regulator for regulating by the signal of a liquid level sensor 21 of the outlet of the high-temperature regenerator. Further, the regenerator comprises a variable number-of-revolutions pump PL disposed in the route 7 from the absorber to the low- temperature regenerator, and a low-temperature regenerator circulating amount regulator 25 for allowing the pressure of saturation temperature 24 of the high-temperature regenerator to fall within a predetermined range.