Today, people are increasingly concerned about energy-saving, energy-saving heat pump technology in Japan attract 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. 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 are located 30 meters underground and 30-meters underground. They store hot water at 47 degrees Celsius and cold water at 6 degrees Celsius at night, respectively, and are piped to customers. 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, dehumidifies when it rains in summer, and warms up when it is cold in 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.
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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.