Heat pump system

摘要

A heat pump system includes: a heat-source-side refrigerant circuit having a heat-source-side compressor, a first usage-side heat exchanger operable as a radiator of heat-source-side refrigerant, and a heat-source-side heat exchanger operable as a radiator of heat-source-side refrigerant; and a usage-side refrigerant circuit having a usage-side compressor, a refrigerant/water heat exchanger operable as a radiator of usage-side refrigerant to heat an aqueous medium, and the first usage-side heat exchanger operable as an evaporator of usage-side refrigerant by radiation of heat-source-side refrigerant. The capacity of the heat-source-side compressor is controlled so that a saturation temperature corresponding to the pressure of the heat-source-side refrigerant in the discharge of the heat-source-side compressor becomes a target temperature; and the capacity of the usage-side compressor is controlled so that a saturation temperature corresponding to the pressure of the usage-side refrigerant in the discharge of the usage-side compressor becomes a target temperature.

主权项

1. A heat pump system comprising:
a heat-source-side refrigerant circuit having
a variable-capacity heat-source-side compressor arranged to compress heat-source-side refrigerant,a first usage-side heat exchanger operable as a radiator of the heat-source-side refrigerant, anda heat-source-side heat exchanger operable as an evaporator of the heat-source-side refrigerant; a usage-side refrigerant circuit having
a variable-capacity usage-side compressor arranged to compress usage-side refrigerant,a refrigerant/water heat exchanger operable as a radiator of the usage-side refrigerant to heat an aqueous medium, andthe first usage-side heat exchanger operable as an evaporator of the usage-side refrigerant by radiation of the heat-source-side refrigerant, and a controller configured to control
a capacity of the heat-source-side compressor so that a heat-source-side discharge saturation temperature becomes a predetermined target heat-source-side discharge saturation temperature, the heat-source-side discharge saturation temperature corresponding to pressure of the heat-source-side refrigerant in a discharge of the heat-source-side compressor, anda capacity of the usage-side compressor so that a usage-side discharge saturation temperature becomes a predetermined target usage-side discharge saturation temperature, the usage-side discharge saturation temperature corresponding to pressure of the usage-side refrigerant in a discharge of the usage-side compressor, the controller being further configured to vary the target usage-side discharge saturation temperature according to a predetermined target aqueous medium outlet temperature, the predetermined target aqueous medium outlet temperature being a target value of temperature of the aqueous medium in an outlet of the refrigerant/water heat exchanger.