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Cool Roof Calculator

Topic: Clean Energy
  • Developed by the U.S. Department of Energy's Oak Ridge National Laboratory (Version 1.2) 
  • This version of the calculator is for small and medium-sized facilities that purchase electricity without a demand charge based on peak monthly load. If you have a large facility that purchases electricity with a demand charge, run the Peak version of the calculator in order to include the savings in peak demand charges from using solar radiation control. 
  • What you get out of this calculator is only as good as what you put in. If you click here , you'll find help in figuring out the best input values. Some things, such as the weathering of the solar radiation control properties and the effects of a plenum, are especially important. You'll also find help in figuring out your heating and cooling system efficiencies and proper fuel prices. 
  • To compare two non-black roofs, print out results of separate estimates for each vs. a black roof. Manually compute the difference in savings to compare the two non-black roofs. 
  • If your energy costs are determined by on-peak and off-peak rates, print out results of separate estimates with on-peak and off-peak rates for the same roof. Judge what fraction of the savings with on-peak rates is appropriate.

For more information, please visit http://web.ornl.gov/sci/buildings/tools/cool-roof/.