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Comment [LU4]: This section seems a bit thin in comparison to the others. Also, we had a presentation here on Salt water heat pumps. I’ll try to get you that info Geo‐exchange Energy GEO‐EXCHANGE The subsurface of the earth is heated both by the solar radiation and the radiant heat from the extreme temperatures of the earth’s core. The shallow ground near the Earth's surface that maintains a relatively constant temperature of 50°‐60° F. This heat extracted directly from the ground provides heating and cooling in homes and other buildings. Geo‐exchange Systems Ground Source Heat‐Pumps (geo‐exchange): Geo‐exchange heat pump systems consist of basically three parts: the ground heat exchanger, the heat pump unit, and the air delivery system (ductwork). The heat exchanger is basically a system of pipes called a loop, which is buried in the shallow ground near the building. Common loop units include a vertical, horizontal, slinky or pond loops (Image to right). A fluid (usually water or a mixture of water and antifreeze) circulates through the pipes to absorb or relinquish heat within the ground. www1.eere.energy.gov Heat Pump Systems The heat pump (image to the left) removes heat from the heat exchanger (through a compressor) and pumps it into the indoor air delivery system. The process can be reversed and the heat pump moves heat from the indoor air into the heat exchanger. The heat removed from the indoor air during the summer can also be used to heat water, providing a free source of hot water. Geo‐exchange heat pumps use significantly less energy than conventional electrical heating systems. (EERE, 2009) They are also more efficient when cooling your home. Not only does this save energy and money, it reduces air pollution. (NREL, 2009) Geo‐exchange Fuel Source Ground source heat pumps can gain their energy from both the earth’s core and the naturally absorbed sunlight near the surface. Usually surface configurations between 15‐20m are considered to be using solar energy as their heat source. (Boyle, 2004) When depths reach greater than 100m the installed ground heat exchanger is considered to be primarily extracting from a geothermal heat source. (Boyle, 2004) The shallow ground, the upper 10 feet of the Earth in Sitka, maintains a nearly constant temperature between 40° and 50°F (4°‐10°C). Like a cave, this ground temperature is warmer than the air above it in the winter and cooler than the air in the summer. Geo‐exchange heat pumps take advantage of this resource heat and cool buildings. Cost www.alternativeconsumer.comPDF Image | COMPREHENSIVE RENEWABLE ENERGY FEASIBILITY STUDY Sitka
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