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With the development of science and technology, heat pump energy-saving technology has been greatly increased by people's attention. This paper introduces the energy-saving heat pump technology and the wide range of applications of this technology in Japan. Sept. 15 (Reporter He Degong) Today people are increasingly concerned about energy-saving, energy-saving heat pump technology in Japan attracted people's attention. The heat pump heat storage air conditioning system using this technology can supply cold and hot water to the interior of a building by heating or cooling the air to adjust the indoor temperature more economically. This new system consists of air-conditioning outdoor unit similar to the host and large-capacity heat-insulated water tank and other equipment. The main principle of the heat pump is to suck the air, heat the air through the heat pump cycle, and then use the hot air to heat the domestic water directly to the user. In contrast, the refrigerant in the heat pump can cool the air being drawn in and then provide the user with cold water. It has been calculated that the use of a heat pump can save a lot of energy compared to using conventional methods to heat or cool water directly. At present, heat pumps have been used in Japan's office buildings and ordinary families. Near the mouth of the Sumida River, an important river flowing through Tokyo, there are more than 20,000 Qinghai business districts consisting of more than a dozen high-rise buildings. Six high-performance heat pumps and a 19-tonne water storage tank 30 meters underground at 30 meters below the ground in the commercial area store hot water at 47 degrees Celsius and cold water at 6 degrees Celsius, which are handled at night, and are delivered to users through pipes . In the increasingly better insulation properties of automated offices, computers and other office equipment, the heat emitted to the indoor temperature, the increasing demand for air conditioning. In the commercial area of ​​Qinghai, 70% of the places that need air conditioning use heat pumps to adjust the indoor temperature. There is also a concert hall for up to 700 people, which dehumidifies the musical instruments stored there, desiccates it when it rains in the summer, and warms it up in the winter. Heat pump technology also effectively solve this problem. As nighttime electricity is relatively cheap, more than 70% of the hot and cold water in the Qinghai business district is handled well at night. Daytime heat pump disabled to avoid peak electricity. Compared with the traditional technology, Qinghai Commercial Area of ​​carbon dioxide emissions decreased by 61%, saving 30% of electricity. As Japan's Office of Energy and Resources on the heat pump heat storage air conditioning system to give equipment investment grants, in April of this year, Japan has 21,000 buildings using heat pumps. Heat pump water heater in Japan began to enter the family in 2001, the government given some subsidies to consumers. This water heater can make each household saving 30%, very popular with users. Government sources estimate that about 5.2 million Japanese households will use such water heaters by 2010. Now the main difficulty of further popularizing this kind of products is the price is too high. Each heat pump water heater costs 600,000 yen (about 1 U.S. dollar 110 yen). Even with the government subsidy, it is 150,000 yen more than the average water heater. At present, manufacturers are trying to reduce manufacturing costs, making the price of heat pump water heater more acceptable. Japanese Institute of Housing Environment Planning experts handsome in the view that to reduce dependence on imported energy to achieve the "Kyoto Protocol" to reduce greenhouse gas emissions targets, that is, between 2008 and 2012, Japan's greenhouse gas emissions to be reduced by 6%, the family , Office buildings must control the increasing energy consumption, energy saving is the right choice for people. Heat pump energy-saving technology due to adapt to the trend of the times, broad prospects for development. Related Keywords: source heat pump, ground source heat pump, water source heat pump, air source heat pump, sewage source heat pump