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随着国民经济建设的发展以及国防建设的需要,对热能的需求量与日俱增。为此,人们通过开采煤矿、石油、天然气、应用核燃料、利用水力能、太阳能等,不断地开辟各种各样的热能资源。此外,在地球内部还蕴藏着我们所需要的巨量的热能——地下热能,简称地热。据估计,地下热能的总量约为地球上贮存的全部煤燃烧时放出热量的一亿七千万倍。地热资源遍布于世界各地,人们很早就开始利用地热资源。早在1904年意大利就在拉德
With the development of the national economy and the needs of national defense construction, the demand for heat energy is increasing day by day. To this end, people continue to develop a wide range of thermal energy resources by mining coal, oil, natural gas, applying nuclear fuel, using hydraulic power and solar energy. In addition, the Earth also contains a huge amount of heat we need - underground heat, referred to as geothermal. It is estimated that the total amount of underground thermal energy is about 170 million times the amount of heat released when all the coal stored on Earth burns. Geothermal resources all over the world, people began to use geothermal resources very early. As early as 1904, Italy was at Rad