Heat pump system

A heat pump system comprising:

• a heat pump cycle including
• a compressor configured to compress and discharge a refrigerant,
• a condenser configured to release heat of a high-pressure refrigerant compressed by the compressor and condense the high-pressure refrigerant,
• a valve configured to reduce a pressure of the refrigerant that has flowed out of the condenser, and
• an evaporator configured to cause the refrigerant whose pressure is reduced by the valve to absorb heat and evaporate;
• a heating heat exchanger configured to heat ventilation air to be blown into a space to be air conditioned by using a heat source that is the heat released from the high-pressure refrigerant in the condenser;
• a low-temperature side heat medium circuit configured to circulate a low-temperature side heat medium and cause the refrigerant in the evaporator to absorb heat of the low-temperature side heat medium, the low-temperature side heat medium circuit including
• a heat source device configured to heat the low-temperature side heat medium, and
• a heat amount adjustment unit configured to adjust an amount of heat carried by the low-temperature side heat medium;
• and
• at least one processor and at least one memory storing a program, the program is configured to cause, when executed by the at least one processor, the at least one processor to carry out:
• causing an amount of heat transfer in the heating heat exchanger for heating the ventilation air to approach a predetermined target value via adjustment in a temperature of the low-temperature side heat medium by controlling a rotation speed of the compressor and an operation of at least one of the heat source device and the heat amount adjustment unit, wherein
• the heating heat exchanger is included in a high-temperature side heat medium circuit configured to circulate a high-temperature side heat medium and cause the high-pressure refrigerant in the condenser to release heat to the high-temperature side heat medium, the heating heat exchanger configured to heat the ventilation air via heat exchange with the high-temperature side heat medium, and
• the processor is configured to cause a temperature of the high-temperature side heat medium to approach a target high-temperature side heat medium temperature via the adjustment in the temperature of the low-temperature side heat medium by controlling the rotation speed of the compressor and the operation of at least one of the heat source device and the heat amount adjustment unit, the target high-temperature side heat medium temperature being determined based on a target value of the amount of heat transfer in the heating heat exchanger.