Selection of exhaust fan
The author:AdminPopularity:431release
time:2017-08-09
1. type. The type of exhaust fan is basically developed by the national unity, generally only need to know the type, basically the problem dealt with half;
2. is not anti-high temperature. In some places it is necessary to prevent high temperature, especially high temperature gas. This time, we select the fire fan, should be selected high temperature fire exhaust fan;
3. Oblique flow is still mixed. Although the distance is not big. But if there is a request in this regard, the selection will be some simple;
4. Is it low noise? This is relatively simple, do not explain;
5. Through the air volume, voltage, total pressure, power and other parameters to determine the fan type.
Exhaust fan in the medium temperature is not higher than 85 ℃ under the conditions should be able to long-term normal work. Exhaust fan should ensure that when the delivery medium temperature at 280 ℃ can be homework for 30min, and the temperature of the medium to the ambient temperature can still be connected to normal work. The wind pressure of the smoke blower should be calculated according to the most unlucky loop of the smoke exhaust system and ensure that the residual pressure value is 40 ~ 50Pa in the smoke staircase. Before the room, combined with the front room, fire elevator front room, extermination and other internal residual pressure value of 25 ~ 30Pa. Fire exhaust fan should fit the current standard JB / T10281-2001 "fire exhaust fan skills conditions." Smoke system exhaust fan should be set alone, the direction of the exhaust fan should be in the same area or upper layer of smoke.
The main operating parameters of the exhaust fan are the operating temperature, air volume, total pressure, noise, motor power, speed and shaft power. At the extra speed, the measured pressure curve of the ventilator is given in the operating area Of the curve should be satisfied with the following rules: axial fan exhaust fan in the regular flow, the corresponding pressure value error of ± 5%; centrifugal exhaust fan in the regular flow, the corresponding pressure value error is ± 5%; smoke ventilator in the statement given in the working conditions than the A sound level noise limit should be consistent with JB / T8690-1998 rules.
Exhaust fan can be used in general steel centrifugal fan or dedicated exhaust fan axial fan. The standard of the exhaust fan is in accordance with the Code for Fire Protection of High - rise Civil Building Design. Exhaust fan minimum air flow of 7200m / h, the maximum air flow should not exceed 60000m / h (referring to a smoke partition maximum air volume). Exhaust fan air volume should be required by the amount of air to add not less than 10% to 20% of the margin.