To provide a technology for performing rational operation by improving system efficiency and changing an operation mode according to the fluctuation of heat load, in a combined heat pump system comprising a compression-type heat pump circuit and an absorption-type heat pump circuit with a configuration sharing a condenser and an evaporator.

A compressor 30 is constituted to be operated as a fluid pump and a fluid motor, and comprises a means 12 for switching a refrigerant inflow state for permitting the inflow of a refrigerant from a regenerator 4 to the condenser 1 and a non-refrigerant inflow state for inhibiting the inflow of the refrigerant, a means 50 for switching a connection state for connecting a motor 20 and the compressor 30, and a non-connection state for disconnecting them, a means 40 for generating electric power by being operated by shaft output of the motor 20 and the compressor 30 at least in the non-connection state, and a means 80 for controlling the means 12, 50 on the basis of heat load.

COPYRIGHT: (C)2009,JPO&INPIT