New and Underutilized Technology: Cool Roofs
The following information outlines key deployment considerations for cool roofs within the Federal sector.
Cool roofs stay cool in the sun by minimizing solar absorption and maximizing thermal emission while lessening the flow of heat from the roof into the building and reducing the need for space cooling energy in conditioned buildings. Cool roofs may also increase the need for heating energy in cold climates. For a commercial building, the decrease in annual cooling load is typically much greater than the increase in annual heating load.
Cool roofs are applicable in most building categories.
Climate and Regional Considerations
Climate issues can affect cool roof performance. Cool roofs are more beneficial in warmer climates and may cause energy consumption for heating applications to rise in colder climates.
Key Factors for Deployment
Cool roofs have a lower impact the more insulation is used.
The Secretary of Energy directed all U.S. Department of Energy (DOE) offices to install cool roofs, when life-cycle cost effectiveness is demonstrated, when constructing new roofs, or when replacing old roofs at DOE facilities. Other Federal agencies were also encouraged to do the same.
Federal energy savings, cost-effectiveness, and probability of success are ranked 0-5 with 0 representing the lowest ranking and 5 representing the highest ranking. The weighted score is ranked 0-100 with 0 representing the lowest ranking and 100 representing the highest ranking.
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