Large spaces such as multi-functional training halls, lecture halls, digital projection halls, U-shaped classrooms, public halls, restaurants, etc. adopt commercial rooftop fresh air duct systems, and large lecture halls adopt all-air commercial rooftop fresh air systems. Among them, the large lecture hall, multi-functional training hall, amphitheatre and digital projection hall adopt the disc-shaped diffuser with its own temperature sensing device for overhead delivery, and the return air adopts side-down return; the rest of the space adopts straight-piece diffuser for overhead delivery. Focus on returning to the wind. The air-conditioning system of the large lecture hall is equipped with a total heat recovery device, and the energy in the exhaust air is recovered through the runner heat recovery device during the air-conditioning season to reduce the operating energy consumption of the air-conditioning system. The bypass device can be used to achieve 50% fresh air operation during the transition season. Classrooms with all-air air-conditioning systems use variable-frequency blower fans to achieve 30-40% fresh air operation in the transition season. The air-conditioning unit is composed of basic functional sections such as medium-efficiency bag filter section, heat exchanger coil section, runner heat recovery section, and fan section. Other small-open rooms such as offices, conferences, dormitories, etc. adopt cabinet-type fan coil units and fresh air systems. All fan coils and air-conditioning boxes are equipped with air purification filter devices to improve the quality of indoor air. It can be equipped with ultraviolet medical germicidal lamp.
