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Anonymous users2024-01-24(1) Determine the exhaust air volume according to the number of air exchanges
Kitchens vary greatly, and the size of the kitchen is not proportional to the number of kitchenware and stoves, and the pollutants and heat generated by the same stoves also vary greatly. In fact, kitchen ventilation is not comprehensive ventilation, and there will be a large error in designing the air volume according to the number of air changes.
2) Design the exhaust air volume according to the amount of pollutants emitted
The National Environmental Protection GB18483-2001 "Emission Standard for Cooking Fume" stipulates that each stove needs an air volume of 2000m3 h. The author believes that there are still limitations in designing air volume according to this method. In fact, the actual situation in the catering industry is more complicated
The size of the stove, the stove has Cantonese style, Suzhou style and so on; In addition to the stove, there are soup pots, claypots, steamers, ovens, etc.; In terms of function, there are cooking rooms, cooking rooms, pastry rooms, barbecue rooms, Western food processing rooms, dishwashing rooms, etc., the amount of heat dissipation and pollutant emission are different, and it is inappropriate to simply determine the exhaust air volume according to the number of stoves.
3) Determine the air volume by the size of the hood:
It is appropriate to calculate the air volume by the product of the air inlet area and the air inlet velocity between the lower edge of the hood and the cooktop. The exhaust air volume can be calculated as follows: G = 3600L (h2-h1) Vx, m3 hL--- length of the air inlet surface under the hood (the length of both ends of the hood and the length of the other side of the double-sided air intake should also be calculated), m; h1--- height of cooktop, m; h2--- height of the lower edge of the hood, m; Vx--- inlet air velocity, m s.
The height of the cooktop is calculated by m, and the height of the lower edge of the hood is generally calculated by m. The air inlet speed is selected by about m s. A large number of practices have proved that the air inlet surface of the smoke hood is about 2000 m3 h per meter long, which has an ideal ventilation effect.
The hood should be arranged as close to the wall as possible to reduce the air inlet area and avoid excessive air volume.
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