無論(lun)是(shi)(shi)(shi)(shi)(shi)風冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)式(shi)(shi)箱式(shi)(shi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)水(shui)(shui)(shui)機(ji)，風冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)式(shi)(shi)螺(luo)桿式(shi)(shi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)水(shui)(shui)(shui)機(ji)，還(huan)是(shi)(shi)(shi)(shi)(shi)風冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)式(shi)(shi)低溫冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)水(shui)(shui)(shui)機(ji)，都(dou)需要蒸(zheng)(zheng)(zheng)發(fa)器(qi)。 蒸(zheng)(zheng)(zheng)發(fa)器(qi)是(shi)(shi)(shi)(shi)(shi)風冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)式(shi)(shi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)水(shui)(shui)(shui)機(ji)組制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)系(xi)統(tong)的(de)四(si)大(da)部件之一，是(shi)(shi)(shi)(shi)(shi)提供其中液態制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)劑沸騰和(he)蒸(zheng)(zheng)(zheng)發(fa)的(de)部件或設備(bei)。由于蒸(zheng)(zheng)(zheng)發(fa)是(shi)(shi)(shi)(shi)(shi)一個吸熱過程，蒸(zheng)(zheng)(zheng)發(fa)器(qi)是(shi)(shi)(shi)(shi)(shi)風冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)式(shi)(shi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)水(shui)(shui)(shui)機(ji)組制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)系(xi)統(tong)制(zhi)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)能(neng)力和(he)功能(neng)的(de)最終(zhong)體(ti)現，包(bao)括家(jia)用空調的(de)室內機(ji)，其主要部件就是(shi)(shi)(shi)(shi)(shi)蒸(zheng)(zheng)(zheng)發(fa)器(qi)。事實(shi)上，根據被冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)卻的(de)物體(ti)是(shi)(shi)(shi)(shi)(shi)空氣還(huan)是(shi)(shi)(shi)(shi)(shi)液體(ti)，蒸(zheng)(zheng)(zheng)發(fa)器(qi)通常被稱為空氣冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)卻器(qi)或液體(ti)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)卻器(qi)。

衡量風(feng)冷(leng)(leng)式冷(leng)(leng)水(shui)機(ji)組蒸(zheng)發(fa)器的(de)(de)主要指(zhi)標是(shi)傳(chuan)(chuan)熱(re)系數和傳(chuan)(chuan)熱(re)面。為提高蒸(zheng)發(fa)器的(de)(de)效(xiao)率，首先應提高其傳(chuan)(chuan)熱(re)系數。那么提高傳(chuan)(chuan)熱(re)系數的(de)(de)關鍵是(shi)提高制冷(leng)(leng)劑與傳(chuan)(chuan)熱(re)管壁之(zhi)間的(de)(de)對(dui)流傳(chuan)(chuan)熱(re)。

由(you)于制冷劑沸騰時的(de)表面傳(chuan)熱(re)系數(shu)遠大于蒸(zheng)汽與(yu)管壁(bi)的(de)傳(chuan)熱(re)系數(shu)，因此蒸(zheng)發器內液(ye)體(ti)與(yu)管壁(bi)的(de)接觸面要大，沸騰時產生的(de)蒸(zheng)汽應迅速出院。事實上，提高(gao)傳(chuan)熱(re)系數(shu)是(shi)比較困難的(de)。

當傳熱(re)系數一(yi)定時，換熱(re)面的大小決定了蒸發器的蒸發能力。增(zeng)加(jia)傳熱(re)管的數量和(he)使(shi)用翅片(pian)管（翅片(pian)管）可以(yi)有(you)效地增(zeng)加(jia)傳熱(re)面，是提(ti)高蒸發能力的常用措施。