Heat pump system

A heat pump system comprising:

• a heat source unit having
• a heat-source-side compressor arranged to compress a heat-source-side refrigerant;
• a heat-source-side heat exchanger;
• a variable-capacity heat-source-side blower configured to adjust heat exchange efficiency of said heat-source-side heat exchanger;
• and
• a heat-source-side switching mechanism switchable between
• a heat-source-side radiating operation state in which said heat-source-side heat exchanger functions as a radiator of the heat-source-side refrigerant, and
• a heat-source-side evaporating operation state in which said heat-source-side heat exchanger functions as an evaporator of the heat-source-side refrigerant;
• a first usage unit having
• a first usage-side heat exchanger operable as a radiator of the heat-source-side refrigerant compressed by said heat-source-side compressor,
• a radiation amount adjusting element configured to adjust an amount of radiation in an aqueous medium by radiation of the heat-source-side refrigerant in said first usage-side heat exchanger, and
• a first usage-side flow rate adjustment valve configured to adjust a flow rate of the heat-source-side refrigerant that flows through said first usage-side heat exchanger, the first usage unit being operable to perform an aqueous medium heating operation in which the aqueous medium is heated by radiation of the heat-source-side refrigerant in said first usage-side heat exchanger;
• and
• a second usage unit having
• a second usage-side heat exchanger operable at least as an evaporator of the heat-source-side refrigerant in said heat-source-side radiating operation state of said heat-source-side switching mechanism, and
• a second usage-side flow rate adjustment valve configured to adjust a flow rate of the heat-source-side refrigerant that flows through said second usage-side heat exchanger, the second usage unit being operable to perform an air-cooling operation in which an air medium is cooled by evaporation of the heat-source-side refrigerant in said second usage-side heat exchanger,
• the amount of radiation adjusted by said radiation amount adjusting element or operating capacity of said heat-source-side blower being controlled in accordance with a state of said first usage-side flow rate adjustment valve and said second usage-side flow rate adjustment valve in a case in which said second usage unit performs said air-cooling operation and said first usage unit performs said aqueous medium heating operation.