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美国联邦公路管理局在寒冷天气下防止道路结冰的方法,是采用对地面加热的办法,所用热源不是采用成本昂贵且难以实现的燃料燃烧,而是用免费且取之不尽又到处可得的地热资源。他们用的方法是将装满少量加压的液化氨的许
The method used by the Federal Highway Administration to prevent icy roads in cold weather is to heat the ground by using a fuel source that is not costly and hard to come by, but is free and inexhaustible Geothermal resources. The method they use is to fill a small amount of pressurized liquefied ammonia