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散发大量粉尘或有害气体的车间应尽可能采用局部排风方式,与全面通风方式相比,可减少风量达到节能的目的。但是,有时因排风罩不是密闭罩排风量仍很大,需设置送风系统补风。在采暖区和采暖过渡区冬季要对室外新风加热。例如,某厂描剪车间有二十台双头砂轮机和抛光机,每台吸尘罩的排风量1600m~3/h,总排风量为32000m~3/h。冬季不补风时,因当地气温较低工人把门窗关闭,室内负压大窗玻璃被压碎,工人身体健康很受损害。若设置进风系统补风,冬季用蒸汽或高温热水作热水作热媒采用加热器加热,需供汽0.5t/h,还需敷设室外供热管
A workshop that emits a large amount of dust or harmful gases should use local exhaust methods as much as possible, and can reduce the amount of wind to achieve energy saving compared with the overall ventilation method. However, due to the fact that the exhaust hood is not a large amount of air discharged from the sealed enclosure, an air supply system is required to make up the wind. In the winter of heating area and heating transition area, outdoor fresh air should be heated. For example, a factory shearing workshop has twenty double-head grinders and a polishing machine. The exhaust volume of each suction hood is 1600m~3/h, and the total exhaust volume is 32000m~3/h. When there is no supplemental wind during the winter, due to the low temperature in the local area, the workers close the doors and windows, and the negative pressure window glass inside the room is crushed. The health of the workers is very damaged. If the air inlet system is used to make up the air, the steam or high-temperature hot water is used as the hot medium for heating in the winter and the heater is used for heating. The supply of steam is required to be 0.5t/h. An outdoor heating pipe must be installed.