SINGLE AND DOUBLE EFFECT ABSORPTION REFRIGERATING MACHINE AND ITS OPERATION CONTROL METHOD

PROBLEM TO BE SOLVED : To prevent the thermal loss by preventing the self-flash of the rare absorption liquid flowing into a low heat source regenerator even when the heat source is not supplied to the low heat source regenerator. SOLUTION : In this single and double effect absorption refrigerating machine, a second rare absorption liquid pump P2 is mounted on a low heat source regenerator 9 side of a rare absorption liquid pipe 15 connecting an absorber 2 and the low heat source regenerator 9 through a first rare absorption liquid pump P1 and a low temperature heat exchanger 12, and an upstream side of the second rare absorption liquid pump P2 and an upstream side of an intermediate absorption liquid pump P3 of an intermediate absorption liquid pipe 16 connecting the low heat source regenerator 9 and a high-temperature regenerator 5 through the intermediate absorption liquid pump 3 are communicated with each other through a bypass pipe 17. The start/stop of the second rare absorption liquid pump P2 is controlled on the basis of a temperature of the heat source flowing into the low heat source regenerator 9 or discharged from the low heat source regenerator 9, and a temperature of the brine flowing into an evaporator 1 or discharged from the evaporator 1, and a rotating speed of the second rare absorption liquid pump P2 is controlled on the basis of the temperature of the brine.