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結(jié)冰現(xiàn)象產(chǎn)生原因首先分析利用水蒸氣制冷的原理。在物態(tài)的兩相區(qū)內(nèi)，如維持壓力不變蒸發(fā)或冷凝，其溫度亦不變。因此，利用水蒸氣在濕蒸氣區(qū)內(nèi)實(shí)現(xiàn)制冷循環(huán)，則理論上就可按卡諾逆循環(huán)進(jìn)行。在抽真空初期，由于真空系統(tǒng)中剩余壓力較高，從還原罐中出來的高溫水蒸氣很容易在較低溫度下的管壁凝結(jié)，而釋放出來的潛熱會(huì)通過管壁傳輸?shù)江h(huán)境大氣中。而在抽真空中、后期，由于真空系統(tǒng)中剩余壓力較低，水蒸氣為過熱蒸汽，很顯然此時(shí)水蒸氣

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