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瑞士西华尔公司研制出既没有马达又没有压缩机的大型冷藏系统。它的作用基于氨的下列性质：气态氨在低压时被冷水大量吸收，而在温度上升时又从水中分离出来；在高温高压时会液化；但在高压和较低温度并伴有惰性气体时液态氨会气比．且同时吸收大量的热量。该系统中包含有冷水
Swetal Switzerland has developed a large refrigeration system that has neither a motor nor a compressor. Its role is based on the following properties of ammonia: gaseous ammonia is largely absorbed by cold water at low pressures and separates from the water at elevated temperatures; liquefies at high temperatures and pressures; however, at high pressures and at lower temperatures with inert gases Liquid ammonia will be gas than. And at the same time absorb a lot of heat. The system contains cold water