热泵循环使用的是液体制冷剂，这个循环使得制冷剂在一个封闭环路内从液体到气体交替变化。
Heat pumps circulate a fluid refrigerant that cycles alternatively from its liquid phase to its vapor phase in a closed loop.
热泵循环使用的是液体制冷剂，这个循环使得制冷剂在一个封闭环路内从液体到气体交替变化。
Heat pumps circulate a fluid refrigerant that cycles alternatively from its liquid phase to its vapor phase in a closed loop.
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