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Roof Savings Calculator Overview

Roof Savings Calculator Overview . Joshua New, Ph.D. Whole Building and Community Integration Group Building Technologies Research and Integration Center (BTRIC) Oak Ridge National Laboratory Joseph W. Mellott Director of Business Development The Garland Company Cleveland, Ohio.

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Roof Savings Calculator Overview

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  1. Roof Savings Calculator Overview Joshua New, Ph.D.Whole Building and Community Integration GroupBuilding Technologies Research and Integration Center (BTRIC)Oak Ridge National Laboratory Joseph W. MellottDirector of Business Development The Garland Company Cleveland, Ohio

  2. Buildings use a lot of energy US has 5% of the world’s population and uses 19% of global energy production DOE Goal: By 2030, buildings should use 50% less energy than 2010 baseline Figure 1. U.S. Primary energy consumption, 2006 Source: Building Energy Data Book, U.S. DOE, Prepared by D&R International, Ltd., September 2008.

  3. Figure 2. Residential energy loads attributed to envelope and windows Source: Building Energy Data Book, U.S. DOE, Prepared by D&R International, Ltd., September 2008. Figure 3. Commercial energy loads attributed to envelope and windows Source: Building Energy Data Book, U.S. DOE, Prepared by D&R International, Ltd., September 2008.

  4. COMPUTER TOOL FOR SIMULATING COOL ROOFS Chris Scruton CEC Marc LaFrance DOE BT INDUSTRY COLLABORATIVE R&D A. Desjarlais, W. Miller, J. New R. Levinson, H. Gilbert, H. Akbari ORNL LBNL WBT Joe Huang, Ender Erdem Roof Savings Calculator (RSC)

  5. AtticSim (Attic Simulation) Model • ASTM C 1340-99 Standard For Estimating Heat Gain or Loss Through Ceilings Under Attics CEC PIER: Demonstrations Ft Irwin, US Army Roof & Attic Energy Balance Petrie, T. W., K. E. Wilkes. 1998. “Effect of Radiant Barriers and Attic Ventilation on Residential Attics and Attic Duct Systems: New Tools for Measuring and Modeling,” ASHRAE Trans., vol. 104, 1175-1192. Miller et al. (2007), “Natural Convection Heat Transfer in Roofs with Above-Sheathing Ventilation.” in Thermal Performance of the Exterior Envelopes of Buildings, X, proceedings of ASHRAE THERM X, Clearwater, FL., Dec. 2007.

  6. Attic Thermodynamics

  7. AtticSim Benchmark at Ft Irwin Miller, W. 2010. Field experiments to evaluate cool-colored roofing.Task 2.5.7 CEC milestone report.

  8. User Interface Building description Input Heat gains and losses LOADS LOADS Distribution of heating Hourly SYSTEMS SYSTEMS and cooling weather Production of heating PLANT PLANT and cooling ECON Life-cycle cost analysis Outputs — energy use and costs, indoor conditions, etc. DOE-2.1E Whole Building Simulation Program

  9. Roof Savings Calculator • Replaces: • EPA Roof Comparison Calc • DOE Cool Roof Calculator • Minimal questions (<20) • Only location is required • Building America defaults • Help linksfor unknown information 9

  10. Roof Savings Calculator Building Details HVAC efficiency and utility prices Roof and Attic Information(base vs. comp) Reports energy and cost savings DOE-2.1E+AtticSim CoolColors.lbl.gov RoofCalc.com 10

  11. Current building types Torcellini et al. 2008, “DOE Commercial Building Benchmark Models”, NREL/CP-550-43291, National Renewable Energy Laboratory, Golden CO. “Big Box” Retail Warehouse Office Residential

  12. $/yr AtticSim DOE-2

  13. Roof Savings Calculatorwww.roofcalc.com 13

  14. Roof Savings Calculatorwww.roofcalc.com 14

  15. Roof Savings Calculatorwww.roofcalc.com 15

  16. Roof Savings Calculatorwww.roofcalc.com 16

  17. Roof Savings Calculatorwww.roofcalc.com 17

  18. Roof Savings Calculatorwww.roofcalc.com 18

  19. RoofCalc.com Impact 50,000+ web simulations, 150+ user feedback, 3+ million analysis runs Average: 86 visitors/day 19

  20. HPC used to verify building simulation engine of tool enabling industry promotion of energy efficiency DOE: Office of Science CEC & DOE EERE: BTO Industry & Building Owners Industry partners install 2000+ roofs/mo, is integrating RSC into their proposal generating system (others expected to follow) RoofCalc.com Potential cumulative savings 117.2 Gwh/yr ($1.6 billion/yr) AtticSim Engine (AtticSim/DOE-2) debugged using HPC Science assets enabling visual analytics on 3x(10)6 simulations $/year DOE-2 Roof Savings Calculator (RSC) web site/service developed and validated [estimates energy cost savings of improvements to flat or sloped roofs for any existing condition or climate] Leveraging HPC resources to facilitate deployment of building energy efficiency technologies

  21. Establish a geographic SRI Model that will establish the optimum substrate SRI for each locale based on credible validated date. “Run the calculator backwards.” Goal

  22. Study Parameters • Standard Building • 40,000 square feet • Office Building • Medium Selected for all “toggles” • Actual Energy Costs from Each City Used • R-19 as Insulating Factors • Heating by Fuel – Cooling by Electric

  23. Study Parameters – Cities (14) Selected

  24. Study Parameters – Substrates (23) Selected

  25. Compared with… • All Substrates were compared with • 5% Reflective • 0.90 Emissivity • BUR Roof

  26. While DOE-2.1E] and AtticSim ASTM Standard C 1340-04 have been validated with comparison to empirical data, the integrated RSC engine has not. Furthermore, it is known to have discrepancies with previous cool roofing studies based on engines that didn’t incorporate heat transfer through radiation within the attic assembly that is yet to be reconciled. Disclaimer

  27. Current Results

  28. Current Results – Not Surprising

  29. Current Results – Peak Modality

  30. Current Results – Surprising

  31. Current Results

  32. Current Results

  33. Current Results

  34. Data taken from doe-1 calculator • Changed Assumption R-15*

  35. Results - Similarities • Clearly Warm Climates Still Needed Maximized SRI • Austin • Houston • Miami • Phoenix

  36. Results – Similarities + • Clearly Warm Climates Still Needed Maximized SRI • Cold Climates Showed Modality • Chicago • Fairbanks • Fargo • Minneapolis • San Francisco

  37. Results – Switches • Clearly Warm Climates Still Needed Maximized SRI • Cold Climates Showed Modality • Climates Changed from a SRI Minimized Zone to a Maximized Zone • Atlanta • Baltimore • New York

  38. Results – Surprise • Clearly Warm Climates Still Needed Maximized SRI • Cold Climates Showed Modality • Climates Changed from a SRI Minimized Zone to a Maximized Zone • LA Showed a localized Maximum at 65 SRI

  39. Current Results

  40. Current Results

  41. Forward Effort • More Data • Model Validation • Automate Reverse Modified Calculator

  42. Thank You - Discussion

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