Patent ID: 7827817

Claim:
An absorption heat pump comprising: a high-temperature evaporator for heating and evaporating working medium refrigerant liquid into working medium refrigerant vapor; a low-temperature evaporator for heating and evaporating working medium refrigerant liquid into working medium refrigerant vapor; a high-temperature absorber for heating heat receiving medium with the heat of absorption which is generated when working medium concentrated solution absorbs the working medium refrigerant vapor generated in the high-temperature evaporator and turns into solution with a concentration lower than that of the working medium concentrated solution; a low-temperature absorber which takes in solution with a concentration lower than that of the working medium concentrated solution and heats working medium refrigerant liquid of an evaporator with an operation temperature higher than that of the low-temperature evaporator with the heat of absorption which is generated when the solution absorbs the working medium refrigerant vapor generated in the low-temperature evaporator and turns into a dilute solution with a concentration lower than that of the solution; a generator which takes in and heats the dilute solution and evaporates the working medium refrigerant to convert the dilute solution into working medium concentrated solution; and a condenser which takes in the working medium refrigerant vapor generated in the generator and cools to condense the working medium refrigerant vapor into working medium refrigerant liquid; wherein the working medium refrigerant liquid from the condenser is introduced into the low-temperature evaporator and heated therein, and a portion of the working medium refrigerant liquid from the low-temperature evaporator is introduced into an evaporator on the high-temperature side from the low-temperature evaporator.