Abstract: This article systematically introduces the development history, working principle and characteristics of ground source heat pump air conditioning system. Keywords ground source heat pump working principle First, the concept ground source heat pump is a use of underground shallow geothermal resources (also known as energy, including groundwater, soil or surface water, etc.) can both heating and cooling of energy-efficient air-conditioning system. Ground source heat pump by entering a small amount of high-grade energy (such as electricity), to achieve low-temperature heat transfer to high temperature. In winter, respectively, as a heat pump heat source and the summer air-conditioning cold source, that is, in winter, the heat to "take out" to increase the temperature, the supply of indoor heating; Summer, the indoor heat removed, release Go down to the ground. Usually source heat pump consumes 1kW of energy, users can get more than 4kW of heat or cold. Compared with the boiler (electricity, fuel) heating system, the boiler heating only 90% of the energy or 70 ~ 90% of the fuel can be heat for the user, so the ground source heat pump than the electric boiler heating save More than two-thirds of the energy, compared with the fuel boiler to save about one-half of the energy; due to ground source heat pump heat source temperature is relatively stable throughout the year, usually 10 ~ 25 ℃, the cooling, heating coefficient of up to 4.0 ~ 4.4 , Compared with the traditional air source heat pump, to about 40% higher, the operating costs for the ordinary central air-conditioning 50 to 60%. Therefore, over the past decade or so, especially in the past five years, ground-source heat pump air-conditioning systems have enjoyed rapid development in North America such as the United States, Canada, Central and Northern Europe such as Switzerland and Sweden, and the geothermal market in China has also become increasingly active It can be predicted that this technology will be the most effective heating and cooling air-conditioning technology in the 21st century. Second, the development of ground-source heat pump at home and abroad recent history of ground-source heat pump can be traced back to a patent in Switzerland in 1912, and the true significance of commercial applications of ground-source heat pump only 10 years of history. For example, in the United States, there were 14,000 ground-source heat pumps in the country as of 1985, up from 45,000 in 1997 and 400,000 already so far, with steady growth of 10% annually. Ground-source heat pump systems in commercial buildings in the United States accounted for 19% of the total air-conditioning capacity in 1998, of which 30% were new buildings. The United States ground-source heat pump industry has set up by the United States Department of Energy, Environmental Protection Agency, Edison Institute of Power and many ground-source heat pump manufacturers, the United States ground source heat pump Association, the Association in recent years will invest 100 million US dollars in development, research And promotion work. The United States plans to achieve the goal of installing 400,000 ground-source heat pumps per year by 2001, reducing greenhouse gas emissions by 1 million tons, which is equivalent to reducing pollutant emissions by 500,000 vehicles or planting 1 million acres of trees to save energy costs Reaching 420 million U.S. dollars. Since then, the annual cost of energy conservation has been increased by 170 million U.S. dollars. Unlike the development of ground-source heat pumps in the United States, Central and Northern Europe such as Sweden, Switzerland, Austria, Germany and other countries mainly use shallow geothermal resources, buried underground soil coils (buried depth three, ground source heat pump features a renewable Energy use technology Ground source heat pump is the use of the Earth's surface shallow geothermal resources (usually less than 400 meters deep) as a cold and heat source for energy conversion heating and air conditioning system. Surface shallow geothermal resources can be called geothermal energy, refers to the surface Soil, groundwater or rivers, lakes, the absorption of solar energy, geothermal energy and low-lying latent heat.Floor shallow surface is a huge solar collector, collecting 47% of the solar energy, more than 500 times the annual energy use of mankind more It is truly massive and ubiquitous, regardless of geographical, resource, etc. This near-infinite renewable energy stored on the surface of the earth makes it also a form of clean, renewable energy. , Is a cost-effective energy-saving technology to geothermal or shallow ground surface temperature of resources relatively stable throughout the year, the winter than the ambient air temperature, the summer than the environment Low temperature, is a good heat pump heat source and air conditioning cold source, this temperature characteristics make the ground source heat pump operating efficiency than traditional air conditioning system is 40% higher, so to save energy and save operating costs about 40% In addition, More constant characteristics, making the heat pump operation more reliable and stable, but also to ensure the system's high efficiency and economy.Design and installation of a good ground source heat pump, on average, users can save 30 to 40% of the heating and cooling air-conditioning operation Costs 3. Significant environmental benefits The system operates without any pollution and can be built in residential areas without burning, no fumes and no waste, no need to stack up fuel and waste, and no long-distance heat transfer. Multipurpose, wide range of applications Source heat pump system can be heating, air conditioning, but also for domestic hot water, a multi-purpose machine, a system can replace the original boiler plus air conditioning two sets of devices or systems; can be applied to hotels, shopping malls, Office buildings, schools and other buildings, more suitable for residential heating, air conditioning.In addition, the long service life of units, are more than 15 years; unit tight , Save space; low maintenance costs; high degree of automatic control, unattended. Fourth, the heat pump classification Heat pump is the need for the condenser heat, evaporator heat from the environment, this time from the environment to heat the object is called Heat source; the opposite is the need to cool the evaporator cooling, condenser discharge heat to the environment, this time to the environment heat the object is called the cold source. Evaporator condenser according to the circulating refrigerant and environmental heat transfer medium, the main It is divided into air heat exchange and water heat exchange.Two kinds of heat pump or refrigerator can be divided into water-water type, water-air type, air-water type and air-air type A total of four types.Use air as heat source heat pump, called air source heat pump.Air source heat pump has a long history, and its installation and use are very convenient, widely used.However, due to regional air temperature differences in the Our typical application area is south of the Yangtze River.In North China, the average winter temperature is below zero degrees Celsius, the air source heat pump is not only bad operating conditions, poor stability, and because there is frost asked ,low efficiency. The use of water as a heat source heat pump, called water source heat pump. Water is an excellent heat source. Its heat capacity is large and its heat transfer performance is good. Generally, the efficiency and capacity of cooling and heating of water source heat pump are higher than that of air source heat pump. However, the application of water source heat pump is much less than that of air source heat pump due to the limitation of water source. Ground source heat pump works Ground source heat pump is the use of water source heat pump in a form, it is the use of water and ground energy (groundwater, soil or surface water) for cold and heat exchange as a water source heat pump cold and heat source, the winter Earth's heat in the "take" out, supply indoor heating, at this time for the "heat source"; Summer heat to the room, released into the groundwater, soil or surface water, at this time can be "cold source." Ground source heat pump heating air conditioning system is divided into three parts: outdoor heat exchange system, water source heat pump units and indoor heating air conditioning terminal system. Water source heat pump which there are two main forms: water - water or water - air type. Between the three systems by water or air heat transfer medium for heat transfer, water source heat pump and ground heat exchanger medium is water, and building heating and air conditioning at the end of the heat transfer medium can be water or air. Compared with air source heat pump ground source heat pump, there are many advantages: (1) small temperature fluctuations throughout the year. Winter temperature is higher than the air temperature, summer air temperature is lower than the ground, so the ground source heat pump heating, cooling factor is higher than the air source heat pump, generally higher than 40%, so energy saving and cost savings of about 40%. (2) Winter operation does not require defrosting, reducing frost and defrosting losses. (3) ground source has a better energy storage effect. Sixth, the ground source classification According to the outdoor heat exchange method can be divided into three categories: 1. Soil buried coil system, 2. Groundwater system, 3. Surface water system. Overflow: hidden;} [Buy] fire pump, spray pump, sewage pump [Buy] Bearing Accessories [Buy] Air lock valve [ Buy】 Signal amplifier ã€Purchase】 valve ã€Purchase】 Centrifugal pump ã€Purchase】 Vertical multi-stage pump ã€Purchase】 Cylinder ã€Purchase】 Speed ​​?? inverter motor Previous: Nemo pump in heavy sediment transport applications Piece: China production ZBEC80 water ring vacuum pump passed provincial appraisal
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