Heat pump system

A heat pump system comprising a refrigerant circuit including a compressor, an indoor-side heat exchanger, a hot-water supply-side heat exchanger, an indoor-side pressure reducing mechanism, a hot-water supply-side pressure reducing mechanism, and a heat source-side heat exchanger,

• the refrigerant circuit including
• a passage connecting the indoor-side heat exchanger and the indoor-side pressure reducing mechanism in series, and
• a passage connecting the hot-water supply-side heat exchanger and the hot-water supply-side pressure reducing mechanism in series, and being connected in parallel with the passage connecting the indoor-side heat exchanger and the indoor-side pressure reducing mechanism,
• wherein the heat pump system is configured to operate in, when a heating load for heating air by the indoor-side heat exchanger and a hot-water supply load for heating water by the hot-water supply-side heat exchanger are required simultaneously,
• a heating priority mode configured to set an opening degree of the indoor-side pressure reducing mechanism to be larger than an opening degree of the hot-water supply-side pressure reducing mechanism, and
• a hot-water supply priority mode configured to set the opening degree of the hot-water supply-side pressure reducing mechanism to be larger than the opening degree of the indoor-side pressure reducing mechanism, wherein
• the heating priority mode adjusts a degree of subcooling of the indoor-side heat exchanger based on the opening degree of the indoor-side pressure reducing mechanism and the opening degree of the hot water supply-side pressure reducing mechanism,
• the hot-water supply priority mode adjusts any one of a degree of subcooling of the hot-water supply-side heat exchanger and a discharge temperature of the compressor based on the opening degree of the indoor-side pressure reducing mechanism and the opening degree of the hot water supply-side pressure reducing mechanism, and
• wherein a ratio of an indoor-heating capacity and a hot-water supply capacity is controlled by an indoor-heating/hot-water supply opening-degree ratio determined by (i) the opening degree of the indoor-side pressure reducing mechanism with respect to a pressure reducing mechanism total opening degree and (ii) the opening degree of the hot-water supply-side pressure reducing mechanism with respect to the pressure reducing mechanism total opening degree, the pressure reducing mechanism total opening degree being a total of (i) the opening degree of the indoor-side pressure reducing mechanism and (ii) the opening degree of the hot-water supply-side pressure reducing mechanism, and
• when the pressure reducing mechanism total opening degree is changed, a change amount of the opening degree of the indoor-side pressure reducing mechanism and a change amount of the opening degree of the hot-water supply-side pressure reducing mechanism are determined by the indoor-heating/hot-water supply opening-degree ratio.