Heat pump-type heating device

摘要

A unitary-side heat pump unit is configured so that a refrigerant circulates sequentially through a first compressor, a first heat exchanger, a cascade heat exchanger, a first expansion valve and an evaporator, and heat exchange with heat media of a heating unit is carried out in the first heat exchanger; a binary-side heat pump unit is configured so that a refrigerant circulates sequentially through a second compressor, a second heat exchanger, a second expansion valve and a cascade heat exchanger, and heat exchange with heat media of the heating unit is carried out in the second heat exchanger; the refrigerants of the unitary-side and binary-side heat pump units include carbon dioxide (CO2) as a main component; and high pressure-side sections of the unitary-side and binary-side heat pump units are activated within substantially identical pressure ranges of supercritical pressure.

主权项

1. A heat pump-type heating device comprising:
a heating unit that circulates heat media to a heating terminal; a unitary-side heat pump unit in which refrigerant circulates sequentially through a first compressor, a first heat exchanger, a cascade heat exchanger, a first expansion valve and an evaporator, and heat exchange with the heat media of the heating unit is carried out in the first heat exchanger; a binary-side heat pump unit in which refrigerant circulates sequentially through a second compressor, a second heat exchanger, a second expansion valve and a cascade heat exchanger, and heat exchange with heat media of a heating unit is carried out in the second heat exchanger; and a controller that controls the heating unit and the unitary-side and binary-side heat pump units, wherein the refrigerants of the unitary-side and binary-side heat pump units include carbon dioxide as a main component; and the controller activates both high pressure-side sections of the unitary-side and binary-side heat pump units within substantially identical pressure ranges of supercritical pressure.