風(feng)(feng)(feng)(feng)機(ji)(ji)風(feng)(feng)(feng)(feng)量的(de)定義為:風(feng)(feng)(feng)(feng)速V與風(feng)(feng)(feng)(feng)道截面積(ji)F的(de)乘積(ji).大(da)型風(feng)(feng)(feng)(feng)機(ji)(ji)由(you)于能夠用風(feng)(feng)(feng)(feng)速計準確測出風(feng)(feng)(feng)(feng)速,所以(yi)風(feng)(feng)(feng)(feng)量計算也很簡(jian)單(dan),直接用公式Q=VF,便可算出風(feng)(feng)(feng)(feng)量.

風(feng)(feng)(feng)(feng)(feng)(feng)機(ji)(ji)數(shu)(shu)量(liang)的確定 根據(ju)所(suo)選(xuan)(xuan)(xuan)房(fang)(fang)間(jian)的換氣(qi)次數(shu)(shu),計算廠房(fang)(fang)所(suo)需(xu)總(zong)風(feng)(feng)(feng)(feng)(feng)(feng)量(liang),進而計算得風(feng)(feng)(feng)(feng)(feng)(feng)機(ji)(ji)數(shu)(shu)量(liang).計算公(gong)式：N=V×n/Q 其中(zhong)：N——風(feng)(feng)(feng)(feng)(feng)(feng)機(ji)(ji)數(shu)(shu)量(liang)（臺(tai)）； V——場地體(ti)積（m3）； n——換氣(qi)次數(shu)(shu)（次/時(shi)）； Q——所(suo)選(xuan)(xuan)(xuan)風(feng)(feng)(feng)(feng)(feng)(feng)機(ji)(ji)型(xing)(xing)(xing)號的單(dan)臺(tai)風(feng)(feng)(feng)(feng)(feng)(feng)量(liang)（m3/h）.風(feng)(feng)(feng)(feng)(feng)(feng)機(ji)(ji)型(xing)(xing)(xing)號的選(xuan)(xuan)(xuan)擇應該(gai)根據(ju)廠房(fang)(fang)實(shi)際情況(kuang),盡量(liang)選(xuan)(xuan)(xuan)取與(yu)原(yuan)窗口尺(chi)寸(cun)相(xiang)匹(pi)配的風(feng)(feng)(feng)(feng)(feng)(feng)機(ji)(ji)型(xing)(xing)(xing)號,風(feng)(feng)(feng)(feng)(feng)(feng)機(ji)(ji)與(yu)濕簾盡量(liang)保持(chi)一定的距(ju)離(li)（盡可能分別裝(zhuang)在廠房(fang)(fang)的山墻兩(liang)側）,實(shi)現良好的通風(feng)(feng)(feng)(feng)(feng)(feng)換氣(qi)效果(guo).排(pai)風(feng)(feng)(feng)(feng)(feng)(feng)側盡量(liang)不(bu)靠近附(fu)近建筑物,以防(fang)影響附(fu)近住戶.如(ru)從(cong)室內帶出的空(kong)氣(qi)中(zhong)含有(you)污(wu)(wu)染(ran)(ran)環(huan)境(jing),可以在風(feng)(feng)(feng)(feng)(feng)(feng)口安裝(zhuang)噴水裝(zhuang)置,吸附(fu)近污(wu)(wu)染(ran)(ran)物集中(zhong)回收(shou),不(bu)污(wu)(wu)染(ran)(ran)環(huan)境(jing)