据日刊《日本经济新闻》报导，日本开发以空气为冷媒的商业化冷冻系统，这种系统不使用氟或氨等会破坏地球臭氧层的冷媒。该系统是将空气快速进行压缩至1／2后温度上升到10O℃，然后再使空气膨胀2倍，使其温度下降到一50℃～60℃，而不会破坏环境。新开发的制冷系统可应用于冷? According to the Japanese “Nihon Keizai Shimbun,” Japan has developed a commercial refrigeration system that uses air as its refrigerant, a system that does not use refrigerants such as fluorine or ammonia, which can damage the Earth’s ozone layer. The system is to quickly compress the air to 1/2 after the temperature rose to 10O ℃, and then make the air expansion 2 times, the temperature dropped to a 50 ℃ ~ 60 ℃, without damaging the environment. The newly developed refrigeration system can be applied to cold?