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家用中央空調水系統主要是水冷式,即冷卻水系統和冷凍水/熱水系統,一般采用單管制,夏天循環冷凍水,冬天循環熱水,循環水系統是中央空調系統中重要的一部分。水系統的運行過程,半集中式風機盤管系統將室內負荷全部由冷熱水機組來承擔。而各房間風機盤管通過管道與冷熱水機組相連,靠所提供的冷熱水來供冷和供熱。

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