Air-conditioning system and air-conditioning control method

An air-conditioning system, comprising:

• a heat-source device that includes a compressor and a heat-source-side heat exchanger;
• a relay device that includes a pump and an intermediate heat exchanger;
• a plurality of indoor units that each include a load-side heat exchanger;
• a refrigerant circuit, formed by the compressor, the heat-source-side heat exchanger, and the intermediate heat exchanger that are connected to one another via a refrigerant pipe, through which refrigerant circulates;
• a heat medium circuit, formed by the pump, the intermediate heat exchanger, and the load-side heat exchanger of each of the plurality of indoor units that are connected to one another via a heat medium pipe, through which a heat medium circulates;
• a flow rate detection unit provided to each of the plurality of indoor units and configured to detect flow rate information associated with a flow rate of a heat medium that flows through each of the plurality of indoor units;
• and
• a controller configured to control operation of at least either the compressor or the pump on a basis of the flow rate information associated with each of the plurality of indoor units and detected by the flow rate detection unit.