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載冷(leng)(leng)(leng)劑是在間(jian)接冷(leng)(leng)(leng)卻的制冷(leng)(leng)(leng)裝(zhuang)(zhuang)置中(zhong)，完成將被冷(leng)(leng)(leng)卻系統（物(wu)體或(huo)空(kong)(kong)間(jian)）的熱量(liang)傳遞給制冷(leng)(leng)(leng)劑的中(zhong)間(jian)冷(leng)(leng)(leng)卻介質(zhi)(zhi)。  這(zhe)種(zhong)中(zhong)間(jian)冷(leng)(leng)(leng)卻介質(zhi)(zhi)亦稱為第二(er)制冷(leng)(leng)(leng)劑。空(kong)(kong)調工程、工業生產和科(ke)學試驗中(zhong)，常常采用(yong)制冷(leng)(leng)(leng)裝(zhuang)(zhuang)置間(jian)接冷(leng)(leng)(leng)卻被冷(leng)(leng)(leng)卻物(wu)，或(huo)者將制冷(leng)(leng)(leng)裝(zhuang)(zhuang)置產生的冷(leng)(leng)(leng)量(liang)遠距離輸送，這(zhe)時，均(jun)需要一種(zhong)中(zhong)間(jian)物(wu)質(zhi)(zhi)，在蒸發器內被冷(leng)(leng)(leng)卻降(jiang)溫(wen)，然后再(zai)用(yong)它冷(leng)(leng)(leng)卻被冷(leng)(leng)(leng)卻物(wu)，這(zhe)種(zhong)中(zhong)間(jian)物(wu)質(zhi)(zhi)稱為載冷(leng)(leng)(leng)劑。