果品預冷方法有3種：①強制性風冷。②水冷。③真空預冷。
　　強制(zhi)性風(feng)(feng)(feng)(feng)(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)是將(jiang)比果(guo)(guo)(guo)溫(wen)低5-10℃的(de)(de)(de)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)風(feng)(feng)(feng)(feng)(feng)以(yi)3-5米(mi)(mi)／秒的(de)(de)(de)風(feng)(feng)(feng)(feng)(feng)速(su)吹向果(guo)(guo)(guo)箱(xiang)（筐）垛，使(shi)果(guo)(guo)(guo)品快速(su)降溫(wen)其(qi)中(zhong)(zhong)(zhong)(zhong)以(yi)壓差式(shi)(shi)風(feng)(feng)(feng)(feng)(feng)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)效果(guo)(guo)(guo)最好。其(qi)做法(fa)是，將(jiang)帶通風(feng)(feng)(feng)(feng)(feng)小孔(kong)的(de)(de)(de)果(guo)(guo)(guo)箱(xiang)堆放(fang)在(zai)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)庫(ku)(ku)(ku)中(zhong)(zhong)(zhong)(zhong)，成4米(mi)(mi)寬、4-6米(mi)(mi)長、2.5米(mi)(mi)高的(de)(de)(de)垛，垛中(zhong)(zhong)(zhong)(zhong)間(jian)留有 50厘米(mi)(mi)寬的(de)(de)(de)風(feng)(feng)(feng)(feng)(feng)道的(de)(de)(de)前下端安裝一臺風(feng)(feng)(feng)(feng)(feng)量為1000米(mi)(mi)3/小時的(de)(de)(de)軸流(liu)風(feng)(feng)(feng)(feng)(feng)機，用塑料布把垛前、后(hou)遮住(zhu)，只留一個風(feng)(feng)(feng)(feng)(feng)機進風(feng)(feng)(feng)(feng)(feng)口(kou)。風(feng)(feng)(feng)(feng)(feng)機工作時，冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)庫(ku)(ku)(ku)中(zhong)(zhong)(zhong)(zhong)的(de)(de)(de)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)風(feng)(feng)(feng)(feng)(feng)從箱(xiang)垛的(de)(de)(de)側面通過箱(xiang)子的(de)(de)(de)小孔(kong)流(liu)經果(guo)(guo)(guo)實，將(jiang)果(guo)(guo)(guo)實冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)卻(que)后(hou)的(de)(de)(de)氣流(liu)從中(zhong)(zhong)(zhong)(zhong)間(jian)風(feng)(feng)(feng)(feng)(feng)道進入軸流(liu)風(feng)(feng)(feng)(feng)(feng)機后(hou)被抽出。 水冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)式(shi)(shi)分噴(pen)淋式(shi)(shi)及沉浸式(shi)(shi)兩種。噴(pen)淋式(shi)(shi)將(jiang)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)水直接(jie)噴(pen)在(zai)果(guo)(guo)(guo)實上；沉浸式(shi)(shi)是將(jiang)果(guo)(guo)(guo)實傾倒在(zai)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)水中(zhong)(zhong)(zhong)(zhong)進行冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)卻(que)，水冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)法(fa)降溫(wen)速(su)度快。真空(kong)預冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)是將(jiang)果(guo)(guo)(guo)實放(fang)在(zai)密閉的(de)(de)(de)容器中(zhong)(zhong)(zhong)(zhong)抽真空(kong)，使(shi)果(guo)(guo)(guo)實表面水分蒸發，吸(xi)取果(guo)(guo)(guo)實的(de)(de)(de)熱量，使(shi)果(guo)(guo)(guo)品迅速(su)冷(leng)(leng)(leng)(leng)(leng)(leng)(leng)卻(que)。例如蘋(pin)(pin)果(guo)(guo)(guo)的(de)(de)(de)通風(feng)(feng)(feng)(feng)(feng)庫(ku)(ku)(ku)貯(zhu)藏，蘋(pin)(pin)果(guo)(guo)(guo)通風(feng)(feng)(feng)(feng)(feng)貯(zhu)藏設有自然通風(feng)(feng)(feng)(feng)(feng)口(kou)或強制(zhi)通風(feng)(feng)(feng)(feng)(feng)口(kou)，配有溫(wen)度計和濕度計，定時檢(jian)測庫(ku)(ku)(ku)內外溫(wen)、濕度，靈活掌握(wo)通風(feng)(feng)(feng)(feng)(feng)及換氣時間(jian)在(zai)寒冬季(ji)節要(yao)注意保溫(wen)庫(ku)(ku)(ku)內溫(wen)度不低于0℃，并在(zai)門窗處設置防鼠裝置。