無論(lun)是風(feng)冷(leng)(leng)(leng)(leng)式(shi)(shi)(shi)(shi)(shi)箱式(shi)(shi)(shi)(shi)(shi)冷(leng)(leng)(leng)(leng)水(shui)機(ji)(ji)(ji)，風(feng)冷(leng)(leng)(leng)(leng)式(shi)(shi)(shi)(shi)(shi)螺桿(gan)式(shi)(shi)(shi)(shi)(shi)冷(leng)(leng)(leng)(leng)水(shui)機(ji)(ji)(ji)，還是風(feng)冷(leng)(leng)(leng)(leng)式(shi)(shi)(shi)(shi)(shi)低溫冷(leng)(leng)(leng)(leng)水(shui)機(ji)(ji)(ji)，都需(xu)要蒸(zheng)發器(qi)(qi)。 蒸(zheng)發器(qi)(qi)是風(feng)冷(leng)(leng)(leng)(leng)式(shi)(shi)(shi)(shi)(shi)冷(leng)(leng)(leng)(leng)水(shui)機(ji)(ji)(ji)組制(zhi)(zhi)冷(leng)(leng)(leng)(leng)系(xi)統的(de)(de)四大部件之(zhi)一(yi)，是提供其中液(ye)態制(zhi)(zhi)冷(leng)(leng)(leng)(leng)劑沸(fei)騰和蒸(zheng)發的(de)(de)部件或設(she)備。由于蒸(zheng)發是一(yi)個(ge)吸熱(re)過程(cheng)，蒸(zheng)發器(qi)(qi)是風(feng)冷(leng)(leng)(leng)(leng)式(shi)(shi)(shi)(shi)(shi)冷(leng)(leng)(leng)(leng)水(shui)機(ji)(ji)(ji)組制(zhi)(zhi)冷(leng)(leng)(leng)(leng)系(xi)統制(zhi)(zhi)冷(leng)(leng)(leng)(leng)能力和功(gong)能的(de)(de)最終體(ti)(ti)(ti)現(xian)，包(bao)括(kuo)家用空調的(de)(de)室內機(ji)(ji)(ji)，其主要部件就(jiu)是蒸(zheng)發器(qi)(qi)。事實上(shang)，根據(ju)被(bei)冷(leng)(leng)(leng)(leng)卻(que)的(de)(de)物體(ti)(ti)(ti)是空氣還是液(ye)體(ti)(ti)(ti)，蒸(zheng)發器(qi)(qi)通常被(bei)稱為空氣冷(leng)(leng)(leng)(leng)卻(que)器(qi)(qi)或液(ye)體(ti)(ti)(ti)冷(leng)(leng)(leng)(leng)卻(que)器(qi)(qi)。

衡量風(feng)冷式冷水機組(zu)蒸發(fa)器的主要指標是(shi)(shi)傳熱(re)(re)系(xi)(xi)數和傳熱(re)(re)面。為提高(gao)(gao)蒸發(fa)器的效率，首先應(ying)提高(gao)(gao)其傳熱(re)(re)系(xi)(xi)數。那么提高(gao)(gao)傳熱(re)(re)系(xi)(xi)數的關(guan)鍵是(shi)(shi)提高(gao)(gao)制冷劑與(yu)傳熱(re)(re)管壁(bi)之(zhi)間(jian)的對流傳熱(re)(re)。

由(you)于(yu)制冷(leng)劑沸騰時(shi)的表面傳熱(re)系數遠大于(yu)蒸(zheng)汽與管(guan)壁的傳熱(re)系數，因此蒸(zheng)發器內(nei)液體(ti)與管(guan)壁的接觸(chu)面要大，沸騰時(shi)產生的蒸(zheng)汽應迅速出院。事(shi)實上(shang)，提(ti)高(gao)傳熱(re)系數是(shi)比較困難的。

當(dang)傳(chuan)(chuan)熱系數(shu)一定(ding)時，換熱面(mian)的大小(xiao)決定(ding)了蒸發器的蒸發能(neng)(neng)力(li)。增(zeng)加傳(chuan)(chuan)熱管(guan)的數(shu)量(liang)和使用翅(chi)片(pian)(pian)管(guan)（翅(chi)片(pian)(pian)管(guan)）可以有效地增(zeng)加傳(chuan)(chuan)熱面(mian)，是(shi)提高蒸發能(neng)(neng)力(li)的常用措(cuo)施。