能夠充分滿足機房(fang)環境條件要求的(de)機房(fang)精密空調機(也稱恒溫恒濕(shi)空調)是近三十年中(zhong)逐漸(jian)發(fa)展起來的(de)一個新機種。

　　機(ji)房(fang)專用(yong)精密(mi)(mi)空調有(you)以下特點：大風(feng)(feng)量、小焓(han)差、高顯熱比;機(ji)房(fang)的熱負荷變化(hua)幅度較大，通常在10%-20%之間變動;送(song)(song)回(hui)風(feng)(feng)的方(fang)式多樣，有(you)上送(song)(song)風(feng)(feng)、下送(song)(song)風(feng)(feng)，有(you)上回(hui)風(feng)(feng)、下回(hui)風(feng)(feng)、側回(hui)風(feng)(feng)等，常用(yong)的是(shi)上送(song)(song)下回(hui)和下送(song)(song)上回(hui)式;可(ke)(ke)靠性較高，機(ji)房(fang)專用(yong)精密(mi)(mi)空調的控制(zhi)系統和功能要比一般舒適性空調完善得(de)多;全(quan)年運(yun)行(xing)(xing)可(ke)(ke)靠性，全(quan)天候(hou)運(yun)行(xing)(xing)。

　　基于機(ji)(ji)房精(jing)密(mi)(mi)空(kong)調(diao)的特(te)點(dian)(dian)，采(cai)購人(ren)提出精(jing)密(mi)(mi)空(kong)調(diao)采(cai)購需(xu)求(qiu)時，需(xu)要注(zhu)意和一(yi)般空(kong)調(diao)采(cai)購需(xu)求(qiu)的不同點(dian)(dian)。機(ji)(ji)房專用精(jing)密(mi)(mi)空(kong)調(diao)機(ji)(ji)選型時可依據計(ji)算機(ji)(ji)房及網(wang)絡(luo)機(ji)(ji)房對環境(jing)的要求(qiu)、國標GB50174-93《電子計(ji)算機(ji)(ji)機(ji)(ji)房設計(ji)規范》、開機(ji)(ji)時機(ji)(ji)房的溫濕度標準等確定。

　　選機(ji)和填(tian)寫(xie)采購需求時主要考慮以(yi)下因(yin)素：

　　1.根據機(ji)(ji)房(fang)內設備的(de)(de)發熱(re)量、機(ji)(ji)房(fang)面積、機(ji)(ji)房(fang)條件(包括層高、密封、裝修、室外機(ji)(ji)安裝位(wei)置等)、當(dang)地氣候(hou)條件等估算出機(ji)(ji)房(fang)空調(diao)機(ji)(ji)的(de)(de)總制冷量、總風量、加濕(shi)量等參數，然后選擇合適的(de)(de)設備容量(可以考慮一定(ding)的(de)(de)設備備份)。

　　2.根據整個建筑物的整體結(jie)構選(xuan)用合適的空調(diao)冷(leng)(leng)(leng)卻方(fang)式(shi)(風冷(leng)(leng)(leng)型(xing)、水冷(leng)(leng)(leng)型(xing)、雙(shuang)冷(leng)(leng)(leng)源等(deng))。

　　3.結合機房自身結構特點及(ji)用(yong)戶要求，合理地選(xuan)(xuan)用(yong)送(song)(song)(song)(song)(song)風(feng)(feng)(feng)(feng)(feng)方式(shi)。機房專(zhuan)用(yong)精密空(kong)調(diao)機送(song)(song)(song)(song)(song)風(feng)(feng)(feng)(feng)(feng)形(xing)式(shi)多為上(shang)送(song)(song)(song)(song)(song)下(xia)(xia)回(hui)(hui)和下(xia)(xia)送(song)(song)(song)(song)(song)上(shang)回(hui)(hui)式(shi)。在(zai)選(xuan)(xuan)用(yong)下(xia)(xia)送(song)(song)(song)(song)(song)風(feng)(feng)(feng)(feng)(feng)設(she)備時，靜(jing)電地板(ban)下(xia)(xia)作為空(kong)調(diao)的靜(jing)壓箱，為保(bao)證送(song)(song)(song)(song)(song)風(feng)(feng)(feng)(feng)(feng)順暢靜(jing)電地板(ban)的高度(du)必(bi)須(xu)保(bao)證300㎜。選(xuan)(xuan)用(yong)上(shang)送(song)(song)(song)(song)(song)風(feng)(feng)(feng)(feng)(feng)設(she)備，可以選(xuan)(xuan)用(yong)風(feng)(feng)(feng)(feng)(feng)帽送(song)(song)(song)(song)(song)風(feng)(feng)(feng)(feng)(feng)方式(shi)，一般來說這種機房的靜(jing)空(kong)高度(du)在(zai)2.8米以上(shang)，而且機房的面積不能過大，否則(ze)會(hui)出現送(song)(song)(song)(song)(song)風(feng)(feng)(feng)(feng)(feng)不均(jun)勻現象。

　　4.選(xuan)型(xing)時要考慮節能和今后(hou)運行費用。從節能的角度考慮，宜選(xuan)用雙冷(leng)源型(xing)空(kong)調(diao)，這是一種節能性空(kong)調(diao)，節能電(dian)力(li)資源比(bi)單純的同容量電(dian)制冷(leng)空(kong)調(diao)機節能在40%以上。

　　5.帶(dai)凈(jing)(jing)化系(xi)(xi)統(tong)的(de)(de)精密空(kong)調(diao)需要(yao)(yao)考慮(lv)機(ji)(ji)(ji)外(wai)余壓(ya)要(yao)(yao)求(qiu)。精密空(kong)調(diao)但無凈(jing)(jing)化要(yao)(yao)求(qiu)的(de)(de)系(xi)(xi)統(tong)對空(kong)調(diao)的(de)(de)機(ji)(ji)(ji)外(wai)余壓(ya)要(yao)(yao)求(qiu)不高，主要(yao)(yao)克(ke)(ke)服送回風(feng)管道、閥門、散流器、初效(xiao)過濾器等(deng)。但既有恒(heng)溫恒(heng)濕要(yao)(yao)求(qiu)，又(you)需要(yao)(yao)凈(jing)(jing)化等(deng)級控制(zhi)的(de)(de)系(xi)(xi)統(tong)對空(kong)調(diao)機(ji)(ji)(ji)組(zu)的(de)(de)機(ji)(ji)(ji)外(wai)余壓(ya)要(yao)(yao)求(qiu)較高，一般(ban)系(xi)(xi)統(tong)總阻力(li)在1100Pa-1400Pa之(zhi)間，主要(yao)(yao)克(ke)(ke)服送回風(feng)管道、閥門、散流器、初效(xiao)過濾器、中(zhong)效(xiao)過濾器、高效(xiao)過濾器等(deng)阻力(li)，選型(xing)時需要(yao)(yao)考慮(lv)機(ji)(ji)(ji)外(wai)余壓(ya)要(yao)(yao)求(qiu)。