Introduce the design method of kitchen ventilation system
As a separate system, the room ventilation has high requirements for fire prevention. Generally, the air ducts entering and leaving the kitchen are required to be equipped with fire dampers. It is especially pointed out that if the air ducts serving the kitchen are to pass through the living spaces, they must be 3 to 5 mm thick. Steel pipes, and insulated from the kitchen to each fire damper at least 5m to A-60 level. Maintaining a negative pressure kitchen as a special service space is also a gathering place for soot and steam. Therefore, effective ventilation must be provided to discharge the fumes and steam generated by the kitchen. In order not to allow the fumes and hot steam generated by the kitchen to overflow into the aisles and other ventilation systems, The kitchen must maintain a negative pressure (ie, the amount of air is larger than the amount of air supplied), and the exhaust should be discharged directly into the outside atmosphere, and no return air is set. In the design of kitchen ventilation systems, fan interlocks or two-speed fans are often used. Two-speed fan: When there is no air-conditioning in the middle season, the kitchen exhaust fan can be turned into a low-speed state. At this time, the air volume of the exhaust fan is still larger than the air volume of the blower, which satisfies the requirements of the system negative pressure. At the same time, the system has air-conditioning air supply and mechanical air supply. At this time, the air blower is at a high speed state, and the air volume is greater than the sum of the air volume of the air blower and the air conditioner. Fan interlock: In the case where only mechanical ventilation and mechanical ventilation (no air conditioning local cooling air supply) are provided in the kitchen, as long as the air volume of the blower is smaller than the air volume of the exhaust fan, it is better to install and adjust the air supply duct and the exhaust duct. The damper to balance the air volume. In order to prevent the blower from malfunctioning, the blower still works to cause the system positive pressure and gas overflow. The exhaust fan and the blower motor can be interlocked, so that the blower can not start when the blower fails.
