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turn a turbine generator, exactly like a wood, coal, or natural gas fired electrical power plant, except that the heat source is free and without CO2 emissions. However, as will be discussed later, the availability of high heat geothermal sources is limited by geographic locations. Ground Source Heat Pumps (GSHP) For low heat geothermal sources, anything other than hot springs, geothermal energy can be used directly for district heating, hot water heating, or greenhouses. In these cases, even relatively low ground temperatures can be used to warm water tanks or space heating. Ground source heat pumps (GSHP) operate by using the constant ground temperature as a heat source during the winter when the ground temperature is warmer than ambient air temperatures, and as a heat sink in the summer, when ground temperatures are cooler than ambient temperatures. By pumping a liquid medium through pipes in the ground and then through a compressor and a heat exchanger in the building, GSHP systems use the ground’s warmth to heat buildings, but can also act as cooling systems by taking heat from the house and injecting it back into the ground. The installation of such systems can cut residential energy use by as much as 40 percent of total use. Even when ground temperatures are not warm enough to provide all of the heat for the building, ground source heat can raise the room temperature and reduce the base load on supplementary heating systems. GSHP systems require an electrical input to run the pumps that circulate the fluids, so while they provide cheap heat, they do it at an electrical cost. When designed and installed correctly, systems have a payback period of five to ten years and system life for in-home components is 25 years while ground loop life expectancy is over 50 years. Of the types of geothermal energy available in Alaska, GSHP systems are the most easily implemented and over one million systems have been installed worldwide, including dozens of More information on the Chena power plant: http://www.yourownpower.com/Power/ Final report on the Chena Hot Springs power plant: http://www.akenergyauthority.org/Reports%20and%20Presentations/FinalProjectRepo rt_ChenaPowerGeothermalPlant.pdf Ground source heat pumps melt snow and ice on sidewalks and runways at the Juneau Airport Photo courtesy of JuneauEmpire.com Sustainable Energy Opportunities: Best Practices for Alaska Tribes Page 35PDF Image | Sustainable Energy Opportunities: Best Practices for Alaska Tribes
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