Sustainable Energy Opportunities: Best Practices for Alaska Tribes

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Sustainable Energy Opportunities: Best Practices for Alaska Tribes ( sustainable-energy-opportunities-best-practices-alaska-tribe )

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One method of extending the seasonal use of solar thermal seasons is being investigated in Alberta, Canada and involves using solar thermal panels to heat the ground. In the winter, when solar energy is limited, the stored heat energy that was pumped into the ground during the summer is extracted using a ground source heat pump (see page 36) and used for space heating in surrounding homes (see “Ground Source Heat Pumps” on page 36 for further information). Passive Solar Passive solar energy is more of a housing design concept to utilize the position and design of a building to absorb the sun’s warmth to heat it without mechanical assistance. For instance, the Cold Climate Housing Research Center prototype home built in Anaktuvuk Pass has soil built up against the walls on all sides except the south facing wall. The south facing wall has high efficiency windows to collect as much sunlight as possible to warm the building while releasing as little heat from the structure as possible. Passive solar building design incorporates five main elements that help to make the most of the sun’s energy in the winter, while shedding as much heat as possible during the summer. 1. The first element is aperture, or the window openings that face sunlight and capture the most sunlight during the winter. This involves the position of the building, which should be within 30 degrees of true south and free of shade from other buildings or trees. 2. The second element is to have an “absorber,” a hard, dark surface used to absorb the maximum amount of the sun’s energy as heat. 3. Third is a thermal mass, which is a dense material, stone, concrete, masonry, etc., which holds the thermal energy absorbed by the surface. The five elements of a passively heated home can be used to heat and cool the building. Sustainable Energy Opportunities: Best Practices for Alaska Tribes Page 32

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