Ground Source Heat Pump Works And Technical And Economic Analysis
First, what is the ground source heat pump
Ground source heat pump is a kind of underground shallow geothermal resources (also known as geothermal energy, including groundwater, soil or surface water, etc.) can both heat energy efficient air conditioning system cooling. Ground Source Heat Pump by entering a small amount of high-grade energy (eg electricity), to achieve low level heat energy transferred to the high places. Geothermal energy are in the winter as the heat source heat pump heating and summer air-conditioning cooling source, that is, in winter, the geothermal energy in heat "get" out, raise the temperature, the supply of indoor heating; summer, the interior heat extracted from the can be released into the ground and going. Heat pump energy flow is the use of their energy consumption (eg electricity) will absorb all the heat (that is, absorption of heat energy +) to high-temperature heat source with the input row. And its effect on energy consumption of the refrigerant Freon is compressed to high temperature and pressure conditions, so as to achieve low temperature heat in the heat absorption effect. Please see the energy flow diagram.
Usually ground source heat pump energy consumption of 1kW, the user can get more than 5kW of heat or cold for more than 4kW, so we called it energy-efficient air conditioning system.
And boiler (electricity, fuel) heating systems, the boiler will heat only 90% of the electricity or 70 ~ 90% of fuel for heat, for users, so ground source heat pump than the electric Boiler heating energy savings of more than two thirds, saving more than fuel boilers of more than half the energy; Because of the heat source heat pump is more stable temperature throughout the year, normally 10 ~ 25 , refrigeration, heating coefficient up to 3.5 ~ 4.4, with the traditional air-source heat pump, compared to about 40% higher than its operating costs for the common central air conditioning, 50 ~ 60%
. Therefore, the last decade, especially in the last five years, ground source heat pump systems in North America, such as the United States, Canada and France, Switzerland, Sweden and other countries have achieved rapid development, China's ground-source heat pump market is becoming more active, you can expected that the technology will become the 21st century, the most effective heating and cooling air conditioning technology.
Second, recent development of ground source heat pump at home and abroad
Ground source heat pump's history dates back to 1912, a Swiss patent, Europe's first heat pump is manufactured in 1938. Low-temperature heat it to the river to the City Hall heating, hot water output temperature can reach 60oC. In the winter, heat pump as heating needs, in the summer can also be used refrigerant. Energy crisis of 1973, driven heat pump development leads to a climax. At present, theory and technology of heat pump in Europe are highly developed, this "double benefit" and environmental protection equipment in France, Germany, Japan, the United States and other developed countries has been widely used. Such as the United States, ended in 1985 total of 14,000 mesa source heat pump, installed in 1997 to 45,000 units, 400,000 units installed so far, but the rate of 10% per year steady growth. 1998, U.S. commercial buildings account for ground source heat pump air conditioning system 19% of the total holdings, which accounted for 30% of new construction. U.S. ground source heat pump industry has been established by the U.S. Department of Energy, EPA, Edison Electric Institute, and numerous ground-source heat pump manufacturers to form the U.S. Ground Source Heat Pump Association, the Association will invest 100 million U.S. dollars in recent years in the development, research and promotion. U.S. plans to install 2001 400 000 per year target platform source heat pump, will be reduced 1 million tons of greenhouse gas emissions, equivalent reduction of 50 million cars or planting trees in the discharge of pollutants 1 million acres, up to 4.2 years of saving energy costs 100 million U.S. dollars, after which an additional energy cost savings each year 170 million U.S. dollars.
And the United States, the development of ground source heat pump is different in Northern Europe such as Sweden, Switzerland, Austria, Germany and other countries using mainly shallow geothermal resources, underground coils buried in the soil (depth The cause of ground source heat pump in China in recent years has started, and the promising momentum.
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