VEHICLE-MOUNTED ABSORPTION HEAT PUMP APPARATUS

An in-vehicle absorption heat pump device comprises a regenerator; an in-vehicle heat source for heating the absorbent in the regenerator; a gas-liquid separator; a condenser for condensing gas phase separated from the absorbent; an evaporator for evaporating a condensate to form vapor; an absorber for bringing the relatively concentrated absorbent in liquid phase in contact with the gas phase so as to cause the absorbent to absorb the gas phase and be relatively diluted; an absorbent circulation source for circulating the absorbent; a bypass passage connecting a liquid-phase storing portion of the gas-liquid separator and the regenerator while bypassing the absorber; and a bypass transfer source provided in the bypass passage and returning the absorbent in the gas-liquid separator to the regenerator. This heat pump device can also dilute the absorbent in the absorber by further comprising a diluent passage allowing the condenser and the absorber to communicate with each other and the condensate in the condenser to be supplied to the absorber through the diluent passage by a dilution element.