Air-conditioning system control device and air-conditioning system control method

An air-conditioning system control device configured to control one or a plurality of air-conditioning apparatus installed in a building, comprising:

• a processor
• configured to obtain operation data of the one or plurality of air-conditioning apparatus,
• configured to obtain a heat load estimation for the building,
• configured to determine an air-conditioning apparatus control command so that a preset evaluation index satisfies a preset condition in a preset control-target period under a preset constraint,
• configured to include time sections set therein, to divide the control-target period into a plurality of time periods by one or a plurality of preset division intervals,
• configured to determine a room-temperature change permissible range, a room temperature included in the operation data satisfying the constraint within the room-temperature change permissible range,
• configured to determine a heat-load change permissible range, based on the room temperature included in the operation data, an upper-limit room-temperature set value and a lower-limit room-temperature set value on the room-temperature change permissible range, a building component physical property value indicating a heat-insulating property of the building and a heat-storage property of the building, the heat load estimation, and a heat load to be processed by the one air-conditioning apparatus or a heat load to be processed by each of the plurality of air-conditioning apparatus, and
• configured to determine, for each of the plurality of time sections, as the air-conditioning apparatus control command, an operation frequency and start-stop of the one or plurality of air-conditioning apparatus, based on the heat-load change permissible range and an operation efficiency of the one air-conditioning apparatus or an operation efficiency of each of the plurality of air-conditioning apparatus.