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載(zai)(zai)冷(leng)(leng)(leng)(leng)劑(ji)是在間(jian)接冷(leng)(leng)(leng)(leng)卻的制冷(leng)(leng)(leng)(leng)裝(zhuang)置(zhi)中(zhong)，完成將(jiang)被(bei)冷(leng)(leng)(leng)(leng)卻系(xi)統（物(wu)(wu)體或空間(jian)）的熱(re)量傳遞(di)給制冷(leng)(leng)(leng)(leng)劑(ji)的中(zhong)間(jian)冷(leng)(leng)(leng)(leng)卻介質。  這種(zhong)(zhong)中(zhong)間(jian)冷(leng)(leng)(leng)(leng)卻介質亦稱為第二(er)制冷(leng)(leng)(leng)(leng)劑(ji)。空調工程(cheng)、工業(ye)生(sheng)產(chan)和科學試驗中(zhong)，常(chang)常(chang)采用制冷(leng)(leng)(leng)(leng)裝(zhuang)置(zhi)間(jian)接冷(leng)(leng)(leng)(leng)卻被(bei)冷(leng)(leng)(leng)(leng)卻物(wu)(wu)，或者將(jiang)制冷(leng)(leng)(leng)(leng)裝(zhuang)置(zhi)產(chan)生(sheng)的冷(leng)(leng)(leng)(leng)量遠距(ju)離輸送(song)，這時，均需要一種(zhong)(zhong)中(zhong)間(jian)物(wu)(wu)質，在蒸發器(qi)內(nei)被(bei)冷(leng)(leng)(leng)(leng)卻降溫，然后再用它(ta)冷(leng)(leng)(leng)(leng)卻被(bei)冷(leng)(leng)(leng)(leng)卻物(wu)(wu)，這種(zhong)(zhong)中(zhong)間(jian)物(wu)(wu)質稱為載(zai)(zai)冷(leng)(leng)(leng)(leng)劑(ji)。