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众所周知,从第一台制冷机起,就是采用气体(主要是空气)作为工质的。但是由于空气制冷机的能量效应很低,因此很快被蒸汽制冷机所排挤。
As we all know, from the first refrigerator, it is to use gas (mainly air) as working fluid. However, due to the low energy effect of air chillers, air chillers are quickly squeezed out by steam chillers.