subject: Germany: by technological progress and development of geothermal heat pump technology - heat pumps, ground source heat pump - HVAC Industry [print this page] Germany: by technological progress and development of geothermal heat pump technology - heat pumps, ground source heat pump - HVAC Industry
Channel Recommended: 2008 HVAC industry stock inventory
Geothermal energy, including electricity generation and heat use two methods are relatively mature technology, has been widely used in developed countries, the past 5 years the world average annual growth of geothermal heat utilization is about 13%. The development of geothermal energy in Germany in strong government policies to promote and support, relying on technological progress to develop particularly prominent.
Shallow geothermal energy and Heat Pump Technology
2007 shallow geothermal energy in Germany Heating Have a certain increase in heat Pump Suppliers to sell heat pump system from 44,980 in 2006 to 45,300 in 2007. As of the end of 2007, Germany has installed about 300,000 heat pump systems, but also in newly built building in 15% of the heating system uses a heat pump. German market incentive plan is mainly to promote the heating sector investment in renewable energy, so the field of renewable energy development has great contribution to the role. In 2007, the incentive program under this plan, on a total of about 1.7 billion euros of 164,000 heat pump system provides a subsidy.
Shallow geothermal energy refers to all the material below the surface, such as groundwater, sediments, rocks, etc. contain the heat to the temperature they have to show. Shallow geothermal energy is a renewable and repeatable, may be obtained without interruption, sustainable use, clean and green energy, but also economically viable, technically sound energy. Currently, about 200 meters underground in Germany from within the depth of geothermal energy, used to provide heating and cooling housing (cooling) energy required.
Germany after years of research and development and practice of groundwater extraction wells, underground Heat exchanger And other technical means of heat exchanger piles were shallow geothermal energy, these technologies in combination with heat pump technology. Heat pump heat from low temperature heat to obtain the release of the higher temperature, the heat can be used. And burning natural gas or electric heating system compared to conventional heat pump needs 75% less energy, while carbon dioxide emissions by 20% to 25%. Compared with coal-fired heating systems, emission reduction more.
Wulfen town in Germany, a 71 dozen buildings containing 117 units and a residential area consisting of public indoor swimming pool, with two extraction by wells and three injection wells connected to water heat pump heating system . When the temperature of groundwater exploitation is 10 , re-injected again when the temperature is 5 . The heating system has been effectively running for 30 years.
In Germany, an underground heat exchanger with the heating system investment cost than conventional fuels, burning natural gas or electric heating system investment costs by 20% to 30%. But its running cost is much lower. According to the 2004 accounts, geothermal heating system must be 4 to 6 years after the operation, its investment cost plus operating costs than other less expensive conventional heating system. However, considering the significant increase in energy prices in the near future, based on shallow geothermal heating system running as long as 1 to 2 years will be cheaper than conventional heating systems. If the cooling included, it will be more economical from a running start!
Tbingen, Germany's KreissparkasseTuebingen Bank, its main building is 22 meters with a depth of 18 to 150 energy piles for heating and cooling system. Underground strata formed by the pebbles and sand, groundwater flow through, the temperature is 11.5 , groundwater velocity of 400 meters / year. Hydrogeological conditions to ensure that the underground temperature is kept constant all year round.
Yin tower in Frankfurt, the United States, 112 foundation pile (diameter 1.5 m, length 30 meters), there are 101 piles for the construction of excavation protection (diameter 0.9 m, length 34 meters), heat load of 500 kW.
Deep geothermal energy and mining technology
Deep earth geothermal energy is extremely rich. Drilling technology to recharge the thermal storage technology-based advances in the development of geothermal energy use of this key technology. German R & D activities in this area has been in progress. Currently, the technology advances of deep geothermal energy in economically feasibility.
Earth Research Centre Potsdam German professional manufacturer of tunnel boring special company, developed with a deep hole full of innovative ideas rig. This year in February, they organized a live show. 100 from all over Europe geologists, technicians and energy experts, came to Munich in the vicinity of the called Duoenhaer (Durrnhaar) where shared experience and understanding of what "geothermal technology" in the future. Drilling rig, 52 meters high and has about 2700 horsepower, can be drilled depth of 5,000 meters.
The depth of 4,400 m drilling program, the water 150 liters, seconds, the temperature about 140 . Plans to build a 5 MW geothermal power plant. Of course, the station can operate 24 hours a day, with or without wind and sun.
However, this is only carried out in a number of projects.
German upper Rhine graben Landau geothermal power plant in November 2007 has been put into commercial operation, the installed capacity of 2.5MW, power supply for 6,000 residents. And power generation waste heat produced is sufficient to meet the 1000 population Heating Needs.
In the German molasse basin Unterhaching geothermal power plant since the beginning of heating season in 2007 started a local heat supply network, and in early 2008 into the grid with. Now it's heat output to the 27MWt. Low level of heat consumption in the region's summer, it is also power input of about 3.3MW of electricity. The region has the water temperature reached 120 , the water flow of about 100 ~ 150l / s of the two production wells used to generate electricity. At the same time meet the heating needs of the region.
For development and utilization of geothermal energy, in the northern German basin GroSchnebeck, artificially created water reservoir rock. January 2007 the second hole reached the final depth of 4400m, and completed the hydraulic fracturing tests, and connectivity between the two drilling test. To achieve the water is about 25l / s, the temperature reached 140 . Is preparing to build one power plant.
Currently concentrated in the upper part of Munich and the Rhine Rift Valley there are many geothermal projects are being planned. Geothermal information system according to the German statistics, in 2007 the installed capacity in the heating up 54.9MWt, in the bath treatment on up to 44.9MWt, its annual output, respectively 193.2GHh and 372GHh.
