Heng Hing factory fire exhaust fan fire exhaust wind chassis air conditioning diagram

Air volume calculation method to select the desired fan according to arrangement of kitchen space and fume hood are as follows: 1, the overall exhaust volume, according to the kitchen space, air changes per hour 40-60 times. Such as kitchen total area of ??160 square meters, a height of 3 meters. We need ventilation to 160X3X60 = 28800m3 / h. 2, local kitchen exhaust hood according to the windward side (minus the perimeter wall of the fume hood length), the wind speed of about 0.5 meters per second. Such as kitchen exhaust hood perimeter of 25 meters, where the wall length of 10 meters. The amount of ventilation required to 3600X (25-10) X0.5 = 27000m3 / h II: Calculation of the required static pressure fan duct according to the situation: 1, based on the amount of wind and wind speed (wind speed 10-15 m / s or so) to determine duct cross-sectional area. Duct aspect ratio should not exceed 2: 1 (to save material and reduce the drag). 2, according to the wind speed, the wind pipe cross-sectional area, elbows, reducers, etc. to calculate the drag (ie the required fan static pressure). Three: calculated based on air flow, static pressure. Select the appropriate fan. When the test at least two persons, one person control power, one observes fan operation, abnormal phenomenon immediately stop inspection; First check the direction of rotation is correct; after the fan begins to run should immediately check the operating current of each phase is balanced, whether the current exceed the rated current; if not normal, should be down to check. After running for five minutes, the fan down to check whether there is abnormal phenomenon, confirmed that no anomalies start running again. When the exhaust fan up to speed, it should measure the input current is normal exhaust fan, exhaust fan operating current can not exceed the rated current. If the operating current exceeds the rated current, should check the supply voltage is normal.