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Unformatted text preview: Aldo Leopold Legacy Center Energy Goals and Expected Building Performance Michael Utzinger, Helio-design Architect's Sustainable Design Consultant The primary goal is that energy consumed in the Aldo Leopold Legacy Center over the course of one year balance energy produced on the site during the year. Energy produced on site will include electrical energy generated from sunlight falling on photovoltaic cells mounted on the building roof, heat energy for the building's hot water needs generated from sunlight absorbed by solar thennal collectors mounted on the roof and heat energy from wood collected on site and bumed in the fireplace and wood stoves. The building does not have natural gas or propane hookups. The building receives more than twice the solar encrgy during a summer day than a winter day. Its demand for energy during a winter day will be larger than the energy demand during a summer day. Excess electricity generated from sunlight in summer will be sold to the local electric utility. If demand exceeds production during winter. electricity will be purchased from the local utility Green Power program. Certified Green Power programs require power production from wind. sunlight, hydroelectric or biomass. To meet the energy goal, electrical energy sold to the local utility during the year must equal or exceed electrical energy purchased from the local utility during the same year. Energy comes in many fonns and units (eg. cords of wood, thenns of natural gas). To compare different energy systems, all energy quantities are converted to kilowatt hours of energy. One full cord of wood is equivalent to 5,860 kilowatt hours of energy. One thenn of natural gas is equivalent 10 29.3 kilowatt hours of energy. The energy budget available to the new building is described below. Following that, the energy saving features of the building design is discusscd. Finally, the expected energy perfonnance is compared with measured performance ofa few green buildings. The Energy Budgel o(the Aldo Leopold Legacy Center - the Supply Side The south slope of the main building roof will be completely covered with solar collectors including 224 pholOvohaic panels to convert sunlight to electricity and 2 solar thennal collectors to provide hot water. The photovoltaic cell array is rated to produce 38 kilowatts under peak conditions. For a typical year 45,600 kilowatt hours should be generated from sunlight. This electrical energy production is roughly equal to the amount of energy consumed in one year by 6 Wisconsin households. Two solar thennal panels will produce 2,600 kilowatt hours of water heating. Wood use from the site is more difficult 10 estimate. Assuming 3 cords of wood will be gathered from falls and culling and bumed in two woodstoves and one Rumford fireplace at an aggregate 50% efficiency. wood will generate 8,790 kilowatt hours of useful heating energy. The annual building energy generation budget is 45,600 kilowatt hours of electrical energy and 10,400 kilowatt hours ofthennal energy. The gross floor area of the main building and meeting wing isand 10,400 kilowatt hours ofthennal energy....
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This note was uploaded on 10/07/2008 for the course CIVIL 698 taught by Professor Mikewalters during the Spring '08 term at Wisconsin.
- Spring '08