無論是(shi)(shi)風(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)式箱式冷(leng)(leng)(leng)(leng)(leng)(leng)水機，風(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)式螺桿式冷(leng)(leng)(leng)(leng)(leng)(leng)水機，還是(shi)(shi)風(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)式低(di)溫冷(leng)(leng)(leng)(leng)(leng)(leng)水機，都需要(yao)蒸(zheng)(zheng)發(fa)器。 蒸(zheng)(zheng)發(fa)器是(shi)(shi)風(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)式冷(leng)(leng)(leng)(leng)(leng)(leng)水機組(zu)(zu)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)系(xi)統的(de)四大部(bu)(bu)件(jian)之(zhi)一，是(shi)(shi)提供(gong)其(qi)中(zhong)液(ye)態制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)劑沸騰和蒸(zheng)(zheng)發(fa)的(de)部(bu)(bu)件(jian)或設備。由(you)于(yu)蒸(zheng)(zheng)發(fa)是(shi)(shi)一個吸熱過程，蒸(zheng)(zheng)發(fa)器是(shi)(shi)風(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)式冷(leng)(leng)(leng)(leng)(leng)(leng)水機組(zu)(zu)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)系(xi)統制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)能力(li)和功能的(de)最終(zhong)體現，包括家用(yong)空(kong)調的(de)室內機，其(qi)主要(yao)部(bu)(bu)件(jian)就(jiu)是(shi)(shi)蒸(zheng)(zheng)發(fa)器。事實上，根據被(bei)冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)的(de)物體是(shi)(shi)空(kong)氣還是(shi)(shi)液(ye)體，蒸(zheng)(zheng)發(fa)器通常被(bei)稱為(wei)空(kong)氣冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)器或液(ye)體冷(leng)(leng)(leng)(leng)(leng)(leng)卻(que)器。

衡量風冷(leng)式冷(leng)水機組(zu)蒸(zheng)發器的(de)(de)(de)(de)主要指標是傳熱(re)系數和傳熱(re)面(mian)。為提(ti)高蒸(zheng)發器的(de)(de)(de)(de)效率(lv)，首先應提(ti)高其傳熱(re)系數。那么(me)提(ti)高傳熱(re)系數的(de)(de)(de)(de)關鍵是提(ti)高制冷(leng)劑與傳熱(re)管(guan)壁之間的(de)(de)(de)(de)對流傳熱(re)。

由于制冷劑沸騰時的表(biao)面(mian)(mian)傳熱系(xi)數(shu)遠(yuan)大于蒸汽與管壁的傳熱系(xi)數(shu)，因此蒸發器內(nei)液體與管壁的接(jie)觸面(mian)(mian)要大，沸騰時產生的蒸汽應(ying)迅速出院。事實上，提高傳熱系(xi)數(shu)是比較困難的。

當傳熱系(xi)數一(yi)定時(shi)，換熱面的大小(xiao)決定了蒸發器(qi)的蒸發能(neng)力。增加傳熱管的數量和使用(yong)翅片(pian)管（翅片(pian)管）可以(yi)有效地增加傳熱面，是提高蒸發能(neng)力的常用(yong)措施(shi)。