【 Weak current College 】 ground source heat pump system for refrigeration and heating principle

Ground source heat pump is used for shallow geothermal energy heating refrigeration of new energy technologies, is a heat pump, heat pump is the use of the Carnot cycle and reverse Carnot cycle principle chilling and heat transfer equipment. geothermal heat pump is usually able to transfer heat from the soil in the ground floor or cold to the desired place, usually heat pumps are used for air conditioning or heating with heat pump of. leveraging underground soil massive storage capacity, and cool in winter, the ground source heat transfer from soil to the building, the summer then underground to chilling, a year in the building forms a heat cycle.

The origin of the ground source heat pump

"Heat pump" concept, the oldest in 1912 by Switzerland's experts and the beginning of the technology inside, and the United States.

In 1946, the United States in Oregon in Poland-the city was built the first ground-source heat pump system. However, this energy use patterns did not arouse the attention of the wider community, both in the technical, theoretical, not too big.

1950, Europe began a study of ground source heat pump first orgasm, but due to the low energy prices, this system does not, therefore, have not been promoted. Until the early 1970s the world appeared the first energy crisis, it began to be taken seriously, many companies start a ground source heat pump of research, production and installation. During this period, Europe a lot of ground source heat horizontal tube, used primarily for winter heating. Although Europe is the world's most established rejecter development areas, but it was also because the heat pump technology experts do not understand the installation, the installation workers do not understand the principle of heat pump, resulting in the development of ground source heat pumps take a detour.

As technology advances, on energy consumption and environmental contamination of legislation become more stringent, ground source heat pump development ushered in its another orgasm. European States to Switzerland, Sweden and Austria and other countries as representative, promoting geothermal heating and cooling technologies. The Government adopted the corresponding subsidy policies and protection policies, making ground-source heat pump production and use of the range is expanding rapidly. In the late 1980s, ground source heat pump technology is mature, more scientists devoted to the study of the underground system, and strive to improve the heat absorption and heat transfer efficiency, and increasing emphasis on the environmental impact of the problem. Ground source heat pump production rendering increased trend, Switzerland and Sweden the increase in the rate of more than 10 per cent. United States ground source heat pump production and promote fast, technology produces a rapid development, become the ground source heat pump production and use of the No. 1 power.

Application from the ground-source heat pump, Nordic countries, the main emphasis on the heating in winter, and the United States for the focus on winter and summer. Due to the climatic conditions of the United States and China are similar, so on the application of the United States, ground source heat pump on the heat pump has implications for development.

Ground source heat pump principle

1. refrigeration principle

In refrigeration, heat pump units of work on the refrigerant compressor, allowing the vapor-liquid conversion cycle. By refrigerant/air heat exchanger in refrigerant evaporating indoor air circulation by heat absorption to refrigerants, in refrigerant recycling at the same time and then through the refrigerant/water heat exchanger in the condensing refrigerant by waterway circulation by the refrigerant heat absorption, ultimately by waterway circulation to groundwater or soil. In the indoor thermal continuous shift to the underground, through refrigerant-air heat exchanger to 13 degrees centigrade of cold air are of the form room cooling.

Ground source heat pump refrigeration principle

Second, the heating principle

In heating mode, ground source heat pump unit of work for the refrigerant compressor, and through the four-way valves will refrigerant flow direction reversal.

By the underground water loop absorption groundwater or soil heat through refrigerant/water heat exchanger in refrigerant evaporating, water cycle heat absorption to refrigerants, in refrigerant recycling at the same time and then through the refrigerant/air heat exchanger with condensate inside the refrigerant from the air circulation by the refrigerant heat absorption. Underground heat constantly shifted to indoor, with forced convection, natural convection or radiation to the indoor heating.