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1. A heat pump system comprising:
a heat-source-side refrigerant circuit having a plurality of usage units having usage-side heat exchangers, the plurality of usage units being connected to a heat source unit having a plurality of heat-source-side heat exchangers and a heat-source-side compressor configured to compress a heat-source-side refrigerant; and a controller configured
to cause the plurality of heat-source-side heat exchangers to function as evaporators of heat-source-side refrigerant and radiators of heat-source-side refrigerant, and to carry out an operation to balance the heat load of all of the plurality of usage units, in accordance with the heat load of all of the plurality of usage units, in astute in which a cooling operation or heating operation is set for each of the usage units,the cooling operation being used to cool an aqueous medium by using the evaporation of the heat-source-side refrigerant in the usage-side heat exchangers, andthe heating operation being used to heat the aqueous medium by using the heat radiation of the heat-source-side refrigerant in the usage-side heat exchangers, the usage units have usage-side refrigerant circuits having usage-side compressors configured to compress a usage-side refrigerant, the usage-side compressors being connected to refrigerant/water heat exchangers configured to heat an aqueous medium by heat exchange between the usage-side refrigerant and the aqueous medium, the refrigerant/water heat exchangers being configured to function as heat radiators of the usage-side refrigerant, and the usage-side heat exchangers being configured to function as evaporators of the usage-side refrigerant and radiators of the heat-source-side refrigerant, the controller being further configured to
detect an outside ambient temperature,detect a state of each usage unit, the state indicating whether the respective usage unit is executing the cooling operation or the heating operation, andperform control so that a heat-source-side condensing temperature is below 40° C. upon determining that at least one usage unit is executing the cooling operating, at least one usage unit is executing the heating operation, and the outside ambient temperature is equal to or less than 25° C., and the heat-source-side condensing temperature corresponding to a saturation temperature of the heat-source-side refrigerant in the heat-source-side heat exchangers. |
