無論是(shi)(shi)風(feng)冷(leng)(leng)(leng)(leng)式(shi)箱式(shi)冷(leng)(leng)(leng)(leng)水(shui)(shui)機，風(feng)冷(leng)(leng)(leng)(leng)式(shi)螺桿式(shi)冷(leng)(leng)(leng)(leng)水(shui)(shui)機，還是(shi)(shi)風(feng)冷(leng)(leng)(leng)(leng)式(shi)低溫冷(leng)(leng)(leng)(leng)水(shui)(shui)機，都需要(yao)蒸(zheng)發(fa)(fa)器(qi)(qi)(qi)(qi)。 蒸(zheng)發(fa)(fa)器(qi)(qi)(qi)(qi)是(shi)(shi)風(feng)冷(leng)(leng)(leng)(leng)式(shi)冷(leng)(leng)(leng)(leng)水(shui)(shui)機組(zu)制(zhi)(zhi)冷(leng)(leng)(leng)(leng)系(xi)統(tong)的(de)(de)四大部(bu)(bu)件(jian)之一，是(shi)(shi)提(ti)供其中液態制(zhi)(zhi)冷(leng)(leng)(leng)(leng)劑沸騰(teng)和(he)蒸(zheng)發(fa)(fa)的(de)(de)部(bu)(bu)件(jian)或(huo)設備。由于蒸(zheng)發(fa)(fa)是(shi)(shi)一個吸熱過(guo)程(cheng)，蒸(zheng)發(fa)(fa)器(qi)(qi)(qi)(qi)是(shi)(shi)風(feng)冷(leng)(leng)(leng)(leng)式(shi)冷(leng)(leng)(leng)(leng)水(shui)(shui)機組(zu)制(zhi)(zhi)冷(leng)(leng)(leng)(leng)系(xi)統(tong)制(zhi)(zhi)冷(leng)(leng)(leng)(leng)能力和(he)功能的(de)(de)最終體現，包括家用空(kong)調的(de)(de)室內機，其主要(yao)部(bu)(bu)件(jian)就是(shi)(shi)蒸(zheng)發(fa)(fa)器(qi)(qi)(qi)(qi)。事實上，根(gen)據被冷(leng)(leng)(leng)(leng)卻的(de)(de)物體是(shi)(shi)空(kong)氣(qi)還是(shi)(shi)液體，蒸(zheng)發(fa)(fa)器(qi)(qi)(qi)(qi)通常被稱為(wei)空(kong)氣(qi)冷(leng)(leng)(leng)(leng)卻器(qi)(qi)(qi)(qi)或(huo)液體冷(leng)(leng)(leng)(leng)卻器(qi)(qi)(qi)(qi)。

衡量風冷式冷水機(ji)組蒸發器的(de)主要(yao)指(zhi)標是傳(chuan)熱系數和傳(chuan)熱面。為(wei)提(ti)高(gao)蒸發器的(de)效率，首先應提(ti)高(gao)其傳(chuan)熱系數。那么(me)提(ti)高(gao)傳(chuan)熱系數的(de)關鍵是提(ti)高(gao)制冷劑與傳(chuan)熱管壁之間的(de)對流傳(chuan)熱。

由于制冷劑沸(fei)騰(teng)(teng)時的表面(mian)傳(chuan)(chuan)熱系(xi)數(shu)遠大(da)于蒸(zheng)汽(qi)與(yu)管壁(bi)的傳(chuan)(chuan)熱系(xi)數(shu)，因此蒸(zheng)發器(qi)內液體與(yu)管壁(bi)的接觸面(mian)要(yao)大(da)，沸(fei)騰(teng)(teng)時產(chan)生(sheng)的蒸(zheng)汽(qi)應(ying)迅速(su)出院(yuan)。事實上，提高(gao)傳(chuan)(chuan)熱系(xi)數(shu)是(shi)比較困難的。

當傳(chuan)熱(re)系(xi)數(shu)一定時，換熱(re)面(mian)的大小(xiao)決(jue)定了蒸發器的蒸發能力。增加傳(chuan)熱(re)管的數(shu)量(liang)和使(shi)用翅片(pian)管（翅片(pian)管）可以有效地增加傳(chuan)熱(re)面(mian)，是提高蒸發能力的常用措施。