桂林實驗室通風系統設計,桂林實(shi)驗室通(tong)風工(gong)程(cheng)施(shi)工(gong)

實驗室通風系統設計(ji)參數:

1、對(dui)于客(ke)戶要(yao)求對(dui)實(shi)驗室進(jin)行通(tong)風設計的,通(tong)風換(huan)氣(qi)量(liang)可根據房間的換(huan)氣(qi)次(ci)數(shu)來確定,實(shi)驗室的換(huan)氣(qi)次(ci)數(shu)取(qu)每小時10-12次,特殊情況(kuang)可以相應增大.房間(jian)通風一般選擇500x500的鐵皮罩作為通風未端設備,每個通風罩通風量可達到600m3/h,房間的長(chang)*寬(kuan)x高x10(換氣次數(shu))=房(fang)(fang)間每小時的通風量,然后房(fang)(fang)間每小時的通風量除以600來確(que)定(ding)通風罩(zhao)的數量,支、干管風速(su)按照(zhao)6m/s計算(suan)]

2、通風柜(ju)支管風速為(wei)6-10m/s(計算時一般選擇10m/s),特殊情況(kuang)可超過10m/s,但不宜超過12m/s;干管風速(su)為10-14m/s(計算時般(ban)選擇10m/s如果(guo)管道比較長選擇12m/s,如果風(feng)量大選(xuan)擇14m/s).

3、通風柜面風速一般控制(zhi)在-/s之間(jian),驗收標(biao)準一(yi)般取(qu)/s,佳(jia)面風(feng)速為/s.(測量面風速時,一般將(jiang)拉門(men)拉5cm高度測(ce)量,風速達到-05m/s即算合(he)格,如(ru)果(guo)拉(la)門(men)(men)高(gao)度過(guo)大時,測量拉(la)門(men)(men)下方5cm高(gao)度處(chu)風速,也可合格).

通風柜的危險(xian)等(deng)級(ji)平均面風速(su)(m/s)低面(mian)風速(m/s)備(bei)注高(gao)-//s中(zhong)//s

低-04m/s025m/s

4、室外噪聲應控(kong)制在70dB(A),實驗室內噪聲(sheng)應(ying)控制在55dB(A).(室內噪聲GB60分貝超(chao)標,室外噪音(yin)大約為75分貝).風機的噪聲可以分為本身的機械噪聲(此(ci)噪聲主要(yao)由(you)風扇(shan)質量不(bu)同引起)和(he)風聲(為主要噪聲).在(zai)(zai)風(feng)(feng)(feng)(feng)機(ji)功(gong)(gong)率不大的(de)情況下,可通過在(zai)(zai)風(feng)(feng)(feng)(feng)機(ji)上方(fang)加防雨罩來(lai)消除(chu)風(feng)(feng)(feng)(feng)聲,在(zai)(zai)使用(yong)大功(gong)(gong)率風(feng)(feng)(feng)(feng)機(ji)時一(yi)般在(zai)(zai)風(feng)(feng)(feng)(feng)機(ji)進出口(kou)加消聲器(qi)來(lai)消除(chu)風(feng)(feng)(feng)(feng)聲,機(ji)械噪聲主(zhu)要(yao)靠建隔(ge)音墻、小黑屋或(huo)在(zai)(zai)風(feng)(feng)(feng)(feng)機(ji)進出口(kou)加軟接頭來(lai)解決.減(jian)(jian)振(zhen)的(de)主(zhu)要(yao)方(fang)法為風(feng)(feng)(feng)(feng)機(ji)底座(zuo)做(zuo)成(cheng)減(jian)(jian)振(zhen)底座(zuo)并安裝(zhuang)減(jian)(jian)振(zhen)器(qi)或(huo)加裝(zhuang)減(jian)(jian)振(zhen)墊.

5、通風量()=表面風速(su)(vs)x排毒柜(ju)開口面(mian)(mian)積.電子調風(feng)閥的(de)作(zuo)用是通(tong)(tong)(tong)過(guo)調節(jie)每臺(tai)通(tong)(tong)(tong)風(feng)柜(ju)的(de)風(feng)管半徑(jing)來(lai)調節(jie)每臺(tai)通(tong)(tong)(tong)風(feng)柜(ju)的(de)通(tong)(tong)(tong)風(feng)量,來(lai)達到當(dang)通(tong)(tong)(tong)風(feng)柜(ju)開口面(mian)(mian)積變化時保(bao)持表面(mian)(mian)風(feng)速不(bu)變.

6.排風量()=表面風速(su)(vs)x排毒柜開口(kou)面積.變頻系(xi)統的作用是(shi)改變風機的轉速來改變風機的通風量,當一套通風系(xi)統中(zhong)只有(you)少量幾臺通

風(feng)(feng)(feng)(feng)柜工作(zuo)時,變頻系統(tong)自動(dong)調節風(feng)(feng)(feng)(feng)機(ji)的轉(zhuan)速,從而改變風(feng)(feng)(feng)(feng)機(ji)的通(tong)風(feng)(feng)(feng)(feng)量,從而保(bao)證通(tong)風(feng)(feng)(feng)(feng)柜的面風(feng)(feng)(feng)(feng)速恒定.變頻系統(tong)和調風(feng)(feng)(feng)(feng)閥的作(zuo)用類似,但如果(guo)只(zhi)使

用調風(feng)閥,則當(dang)一(yi)套(tao)通(tong)(tong)風(feng)系(xi)統(tong)中只有少量幾臺通(tong)(tong)風(feng)柜工(gong)作時,風(feng)機仍(reng)然(ran)以高轉速工(gong)作,而使用變(bian)頻系(xi)統(tong)后(hou),調整風(feng)機轉速可節省能(neng)源.