Ventilation system and building equipped with ventilation system

A ventilation system comprising:

• a ventilator structured to ventilate a first indoor space located inside a building, the ventilator including a heat exchange element for performing heat exchange between a supply air flow and an exhaust air flow;
• an air conveyance path structured to communicate the first indoor space and a second indoor space located inside the building different from the first indoor space and convey air from the first indoor space to the second indoor space;
• an air conveyor installed on a ceiling surface of the first indoor space, the air conveyor being structured to include a dust collector for collecting dust contained in air passing through the air conveyance path and to convey, via the air conveyance path, air from the first indoor space to the second indoor space;
• a controller structured to control i) an operation of the ventilator and ii) an operation of the air conveyor;
• and
• a first temperature measurer structured to measure an air temperature of the first indoor space and a second temperature measurer structured to measure an air temperature of the second indoor space, wherein
• the air conveyor includes a flow path switcher structured to switch between i) a conveyance operation of conveying the air from the first indoor space to the second indoor space through the air conveyance path and ii) a circulation operation of circulating air within the first indoor space,
• the controller includes a determiner structured to i) determine a temperature difference between the first temperature of the first indoor space and the second temperature of the second indoor space, and ii) determine whether to perform the conveyance operation of conveying the air from the first indoor space to the second indoor space when the temperature difference is equal to or more than a predetermined temperature or the circulation operation of circulating the air within the first indoor space when the temperature difference is less than the predetermined temperature, and
• the controller controls, based on the determination result of the determiner, the flow path switcher of the air conveyor to switch between i) the conveyance operation of conveying the air from the first indoor space through the flow path switcher and the air conveyance path to the second indoor space and ii) the circulation operation of circulating the air from the first indoor space through the flow path switcher and back to the first indoor space.