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
Joshua New, Ph.D.Whole Building and Community Integration GroupBuilding Technologies Research and Integration Center (BTRIC)Oak Ridge National LaboratoryJoseph W. MellottDirector of Business DevelopmentThe Garland Company Cleveland, Ohio
2 Managed by UT-Battellefor the U.S. Department of Energy
Buildings use a lot of energyUS 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, 2006Source: Building Energy Data Book, U.S. DOE, Prepared by D&R International, Ltd., September 2008.
3 Managed by UT-Battellefor the U.S. Department of Energy
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Figure 2. Residential energy loads attributed to envelope and windowsSource: Building Energy Data Book, U.S. DOE, Prepared by D&R International, Ltd., September 2008.
Figure 3. Commercial energy loads attributed to envelope and windowsSource: Building Energy Data Book, U.S. DOE, Prepared by D&R International, Ltd., September 2008.
4 Managed by UT-Battellefor the U.S. Department of Energy
COMPUTER TOOL FOR SIMULATING COOL ROOFS
INDUSTRY
COLLABORATIVE R&D
Marc LaFranceDOE BT
LBNL
R. Levinson,H. Gilbert,H. Akbari
Chris Scruton CEC
A. Desjarlais, W. Miller, J. New
ORNL
WBTJoe Huang,
Ender Erdem
Roof Savings Calculator (RSC)
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AtticSim (Attic Simulation) Model
Roof & Attic Energy Balance
ASTM C 1340-99 Standard For Estimating Heat Gain or Loss Through Ceilings Under Attics CEC PIER: Demonstrations
Ft Irwin, US Army
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.
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.
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Attic Thermodynamics
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AtticSim Benchmark at Ft Irwin
Miller, W. 2010. Field experiments to evaluate cool-colored roofing.Task 2.5.7 CEC milestone report.
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DOE-2.1E Whole Building Simulation Program
User Interface
LOADS
SYSTEMS
Input
PLANT
ECON
Hourlyweather
Heat gains and losses
Distribution of heating and cooling
Production of heatingand cooling
Life-cycle cost analysis
Building description
Outputs — energy use andcosts, indoor conditions, etc.
LOADS
SYSTEMS
PLANT
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Roof Savings Calculator
· Replaces:- EPA Roof Comparison Calc- DOE Cool Roof Calculator
· Minimal questions (<20)- Only location is required- Building America defaults- Help links for unknown
information
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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
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Residential
Office “Big Box” Retail Warehouse
Current building typesTorcellini et al. 2008, “DOE Commercial Building Benchmark Models”, NREL/CP-550-43291, National Renewable Energy Laboratory, Golden CO.
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$/yr
AtticSim
DOE-2
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Roof Savings Calculatorwww.roofcalc.com
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Roof Savings Calculatorwww.roofcalc.com
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Roof Savings Calculatorwww.roofcalc.com
16 Managed by UT-Battellefor the U.S. Department of Energy
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Roof Savings Calculatorwww.roofcalc.com
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Roof Savings Calculatorwww.roofcalc.com
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Roof Savings Calculatorwww.roofcalc.com
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RoofCalc.com ImpactAverage: 86 visitors/day
50,000+ web simulations, 150+ user feedback, 3+ million analysis runs
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HPC used to verify building simulation engine of tool enabling industry promotion of energy efficiency
Leveraging HPC resources to facilitate deployment of building energy efficiency technologies
DOE: Office of Science CEC & DOE EERE: BTO Industry & Building Owners
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]
RoofCalc.com Industry partners install 2000+ roofs/mo, is integrating RSC into their proposal generating system (others expected to follow)
AtticSim
DOE-2 $/yearEngine (AtticSim/DOE-2) debugged using HPC Science assets enabling
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Goal
Establish a geographic SRI Model that will establish the optimum substrate SRI for each locale based on credible validated date.
“Run the calculator backwards.”
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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 Managed by UT-Battellefor the U.S. Department of Energy
Study Parameters – Cities (14) Selected
Location Electricity, cents/kWh
Gas, $/1000ft3
New York 17.47 12.61
Los Angeles 15.14 9.21
Chicago 11.08 7.75
Houston 11.01 8.43
Miami 11.51 17.00
Phoenix 9.98 13.01
Kansas City 8.29 10.05
Minneapolis 10.37 7.76
San Francisco 15.14 9.21
Austin 11.01 8.43
Atlanta 10.06 14.23
Baltimore 13.44 11.85
Fargo 7.26 7.38
Fairbanks 16.55 8.43
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Study Parameters – Substrates (23) Selected
Description Reflectance Emissivity SRIBUR No Coating 10 90 6Mineral Mod Bit 25 88 25Single Ply 32 90 35Mineral Mod Bit 33 92 35Metal 35 82 35Aluminum Coating over BUR 43 58 35Mineral Mod Bit 45 79 55Coating over BUR 49 83 55Metal 49 83 55Aluminum Coating over BUR 55 45 48Mineral Mod Bit 63 88 75Coating over BUR 63 86 75Metal 63 84 75Single Ply 64 80 75Aluminum Coating over BUR 65 45 65Metal (White) 70 85 85Coating over BUR (White) 75 90 93Single Ply (White) 76 87 94Coating over BUR (White) 79 90 100Mineral Mod Bit (White) 81 80 100Single Ply (White) 82 79 100Coating over BUR (White) 85 90 107Single Ply (White) 85 87 107
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Compared with…
• All Substrates were compared with – 5% Reflective– 0.90 Emissivity – BUR Roof
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Disclaimer
• 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.
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Current Results
Description Reflectance Emissivity SRI Atlanta Austin Baltimore Chicago Fairbanks Fargo HoustonKansas