風(feng)(feng)(feng)(feng)(feng)機(ji)風(feng)(feng)(feng)(feng)(feng)量的(de)定義(yi)為:風(feng)(feng)(feng)(feng)(feng)速(su)V與風(feng)(feng)(feng)(feng)(feng)道截面(mian)積F的(de)乘積.大型風(feng)(feng)(feng)(feng)(feng)機(ji)由于(yu)能夠用(yong)風(feng)(feng)(feng)(feng)(feng)速(su)計(ji)準確測出風(feng)(feng)(feng)(feng)(feng)速(su),所以風(feng)(feng)(feng)(feng)(feng)量計(ji)算也(ye)很簡單,直(zhi)接用(yong)公式Q=VF,便可算出風(feng)(feng)(feng)(feng)(feng)量.

風(feng)機數(shu)(shu)量的確定 根(gen)據所(suo)選房(fang)間的換氣次(ci)數(shu)(shu),計算廠房(fang)所(suo)需總風(feng)量,進而計算得(de)風(feng)機數(shu)(shu)量.計算公式：N=V×n/Q 其(qi)中(zhong)(zhong)：N——風(feng)機數(shu)(shu)量（臺(tai)）； V——場地體(ti)積（m3）； n——換氣次(ci)數(shu)(shu)（次(ci)/時）； Q——所(suo)選風(feng)機型號的單臺(tai)風(feng)量（m3/h）.風(feng)機型號的選擇應該根(gen)據廠房(fang)實(shi)際情況,盡量選取與原窗口(kou)尺寸相匹配的風(feng)機型號,風(feng)機與濕簾(lian)盡量保持(chi)一定的距離（盡可能分別裝(zhuang)在(zai)廠房(fang)的山墻兩側）,實(shi)現良好(hao)的通(tong)風(feng)換氣效(xiao)果.排風(feng)側盡量不(bu)靠近(jin)(jin)附(fu)近(jin)(jin)建筑物,以防影響附(fu)近(jin)(jin)住戶.如從室內(nei)帶出的空(kong)氣中(zhong)(zhong)含有污(wu)染(ran)環(huan)(huan)境(jing)(jing),可以在(zai)風(feng)口(kou)安(an)裝(zhuang)噴水裝(zhuang)置,吸附(fu)近(jin)(jin)污(wu)染(ran)物集中(zhong)(zhong)回收,不(bu)污(wu)染(ran)環(huan)(huan)境(jing)(jing)