【 Weak current college 】 building ventilation and smoke-the second section of the ventilation ducts and equipment

This section more systematically describes the ventilation system used by the pipeline and the main device, as this property management professional should have a preliminary understanding.　　Mechanical ventilation of main equipments are fans, wind pipes or ducts, air valve, air and dust removal equipment, etc. 1. fan the classification 1. blower fan is the ventilation system air flow provide momentum to overcome the conveying process resistance loss of mechanical equipment. In ventilation engineering the most widely used is the centrifugal fan and axial fans.　　Centrifugal fan by the impeller, the enclosure, the crankshaft, suction and exhaust vents, etc. 　　2. fan technology performance ① air flow: refers to the fan in the working state, a unit of time conveying air volume, expressed in m3/h; ② pressure: means the pressure blower units of Pa; ③ effective power: refers to the air blower power, it is equal to the amount of wind and air pressure of the product, unit for W. Second, the ventilation pipe 1. wind pipe materials it into metal and Nonmetal material. ① metal materials with sheet steel, stainless steel plate, aluminum plate, etc. 　　② non-metallic materials with glass fiber reinforced plastic plate, hard PVC panels, concrete duct, etc.　　2. wind tube cross-section shape has two circular and rectangular. 3. air valve air valve installed at the wind pipes or ducts, mainly used for regulation of air flow.　　The ventilation system air-valve can be divided into a control valve, on-off valve and automatic control valves, etc.　　IV. air diffusers in the intake and exhaust vents, wind pipes or ducts at both ends, depending on the occasion of different indoor and outdoor, divided into two forms. Fifth, dedusting equipment for the prevention of pollution of atmospheric air exhaust purification treatment prior to the separation of dust and air, for the processing of equipment called a dust collection equipment. Dedusting equipment types mainly mechanical filter, filter type dust collector, wet scrubbers and electrostatic precipitators four types.