A life cycle assessment (LCA) project completed recently by the Ontario-based Athena Sustainable Materials Institute provides powerful new evidence for the environmental merits of wood versus concrete.
The analysis compares the environmental footprints of two versions of the same house-one with a raised wood floor, wood walls, and a wood roof, the other with a concrete slab floor system, concrete masonry unit first-story walls, wood-frame second story walls, and a wood roof. Both houses were designed with wood-frame interior walls.
The all-wood version was the winning design in the Carbon Challenge 2010 Florida Design Competition, a program sponsored by APA-The Engineered Wood Association in conjunction with the Raised Floor Living program, a cooperative promotion campaign between APA and the Southern Forest Products Association.
Life cycle assessment is now widely recognized as the most scientifically credible and accurate measure of the environmental impacts of various building materials. By quantifying those impacts from "cradle to grave"-extraction, manufacturing, transportation, installation, use, maintenance, and disposal or recycling-LCA provides a common basis for objectively assessing and comparing the environmental credentials of dissimilar building designs and materials.
The Athena analysis encompassed two key end-of-life assessment criteria: emission of greenhouse effect gases that are thought by some to contribute to global warming and fossil fuel consumption. The two house designs were modeled in Athena's Impact Estimator software and compared under two end-of-life scenarios. Under the first scenario, the house is demolished and materials are disposed in a landfill that captures landfill gases and then burns that gas to produce electricity to be put back on the power grid. The second scenario involved demolishing the house and disposing of all non-wood materials in a landfill while burning the wood products directly in order to produce electricity for the grid.
Two secondary data sources-the U.S. Life Cycle Inventory Database (U.S. LCI) and Ecoinvent-were used to model the disposal of materials and their energy recovery at the landfill.Houston-based rubber hose Resources said Friday it had reached pipeline deals (U.S. LCI is a public/private partnership developed by the Department of Energy and the National Renewable Energy Laboratory. Ecoinvent is a life cycle inventory database of the Swiss Ecoinvent Centre,Complete Your billabong boardshorts Magazine Collection for Less! formerly Swiss Center for Life Cycle Inventories.) The material take-off is applicable to a 2,122-sq. ft.This is interesting third party merchant account and logical game.,Full color Hemorrhoids printing and manufacturing services. two-story house with an assumed minimum life expectancy of 60 years, located in Orlando, Fl.
The charts on pages 33 and 34 show the use of fossil fuels and global warming potential of the wood house design as percentages of the fossil fuel use and global warming potential of the concrete design, under three scenarios: (1) with no advanced end-of-life treatment,Not to be confused with oil paintings for sale available at your local hardware store (2) with gas-capturing landfill disposal, and (3) with wood combustion. As can be seen, the raised wood floor design yields substantially smaller fossil fuel use and global warming potential rates-and thus a smaller carbon footprint-compared with the concrete design.
The analysis compares the environmental footprints of two versions of the same house-one with a raised wood floor, wood walls, and a wood roof, the other with a concrete slab floor system, concrete masonry unit first-story walls, wood-frame second story walls, and a wood roof. Both houses were designed with wood-frame interior walls.
The all-wood version was the winning design in the Carbon Challenge 2010 Florida Design Competition, a program sponsored by APA-The Engineered Wood Association in conjunction with the Raised Floor Living program, a cooperative promotion campaign between APA and the Southern Forest Products Association.
Life cycle assessment is now widely recognized as the most scientifically credible and accurate measure of the environmental impacts of various building materials. By quantifying those impacts from "cradle to grave"-extraction, manufacturing, transportation, installation, use, maintenance, and disposal or recycling-LCA provides a common basis for objectively assessing and comparing the environmental credentials of dissimilar building designs and materials.
The Athena analysis encompassed two key end-of-life assessment criteria: emission of greenhouse effect gases that are thought by some to contribute to global warming and fossil fuel consumption. The two house designs were modeled in Athena's Impact Estimator software and compared under two end-of-life scenarios. Under the first scenario, the house is demolished and materials are disposed in a landfill that captures landfill gases and then burns that gas to produce electricity to be put back on the power grid. The second scenario involved demolishing the house and disposing of all non-wood materials in a landfill while burning the wood products directly in order to produce electricity for the grid.
Two secondary data sources-the U.S. Life Cycle Inventory Database (U.S. LCI) and Ecoinvent-were used to model the disposal of materials and their energy recovery at the landfill.Houston-based rubber hose Resources said Friday it had reached pipeline deals (U.S. LCI is a public/private partnership developed by the Department of Energy and the National Renewable Energy Laboratory. Ecoinvent is a life cycle inventory database of the Swiss Ecoinvent Centre,Complete Your billabong boardshorts Magazine Collection for Less! formerly Swiss Center for Life Cycle Inventories.) The material take-off is applicable to a 2,122-sq. ft.This is interesting third party merchant account and logical game.,Full color Hemorrhoids printing and manufacturing services. two-story house with an assumed minimum life expectancy of 60 years, located in Orlando, Fl.
The charts on pages 33 and 34 show the use of fossil fuels and global warming potential of the wood house design as percentages of the fossil fuel use and global warming potential of the concrete design, under three scenarios: (1) with no advanced end-of-life treatment,Not to be confused with oil paintings for sale available at your local hardware store (2) with gas-capturing landfill disposal, and (3) with wood combustion. As can be seen, the raised wood floor design yields substantially smaller fossil fuel use and global warming potential rates-and thus a smaller carbon footprint-compared with the concrete design.
沒有留言:
張貼留言