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Current application status of ground source heat pumps at home and abroad. In 2000, 350,000 ground source heat pump units were installed in the United States. Utilization of geothermal heat pumps in the world in 2000 * * Total installed capacity (MW) Annual energy utilization (TJ/a) Heat supply (Gwh/a) Actual number of units Equivalent number of units (12kw is 1 unit) Australia 2457.61620002000 Austria 2281094303 .91900019000 Bulgaria 13.316245161108 Canada 360891247.53000030000 France 4825570.81204000 Germany 3441149 319.21800028667 Iceland 4205.63333 Japan 3.96417.8323323 Lithuania 21598.8166.3131750 Poland 26.2108.330.140 002183 Sweden 37741281146.85500031417 Switzerland 50019805502100041667 United States 4800120003333.6350000400000 The data in the table above shows that the United States has the most powerful ground source heat pumps, with all indicators exceeding other countries in the world. * * scale of utilization. In the United States, 40,000 12kw ground source heat pumps were installed in 1997, reaching 400,000 units in 2000. It is expected to reach the annual installation level of 1.5 million units in 2010. Its main application areas are schools and office buildings. The development of domestic ground source heat pumps mainly started in 2000, and is still based on underground water source extraction and irrigation. The heat pump system uses underground pipes as heat sources and heat sinks. It has begun to grow rapidly in the past two years, and there are also examples of applications in larger building scales, such as the Beijing Sinopec Party School (50,000m2 building).