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Anonymous users2024-01-24In order to ensure the purification effect, the exhaust air volume is required to be calculated in strict accordance with the suction air speed of the exhaust hood, and the inhalation air speed of the hood is usually not lower than that. The minimum exhaust airflow is usually calculated using the following formula: L=2000PH
Where: L—exhaust air volume of exhaust hood, m3 h;
P—the circumference of the mouth of the hood (the edge against the wall is not counted), m;
H—the distance from the mouth of the hood to the mouth of the stove, m.
After the exhaust air volume is calculated by the above formula, the suction speed of the hood mouth is calculated according to the area of the hood to ensure that the suction speed of the hood is not lower than.
In the actual engineering design, the method of estimation is often adopted, according to the provisions of the kitchen ventilation volume in the "Technical Measures for HVAC Design of Civil Buildings", the kitchen ventilation volume can also be determined according to the following number of air exchanges:
Chinese kitchen: L=40-50 (times h);
Western kitchen: L=30-40 (times h);
Staff canteen: L=25-35 (times h).
The 'side against the wall is not counted' mentioned here means that the side of the exhaust hood against the wall forms a closed space with the wall, and there is no air added to the exhaust hood on the side, and there is only air supplemented vertically upwards like the other four sides, so the calculation does not need to calculate the side length of the side against the wall.
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Anonymous users2024-01-23According to the exhaust hood to calculate the air volume, there is a variable speed, that is, the size of the flue gas produced by the stove below, generally the exhaust air volume per square meter of the exhaust hood is between 2400-800. Air volume = wind speed * cross-sectional area.
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