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Cool Roofs
 IEA Workshop
November 17, 2011
       Kurt Shickman
  kurt@globalcoolcities.org
      001-202-550-5852
    GlobalCoolCities.org
Global Cool Cities Alliance (GCCA)
The Global Cool Cities Alliance is dedicated to advancing policies
and actions that increase the solar reflectance of our buildings and
pavements as a cost-effective way to promote cool buildings, cool
cities, and to mitigate the effects of climate change through global
cooling.




                                                                   2
Cool surfaces are a high-impact, short-payback
investment that:
• Improves buildings by cutting net energy use, help roofs and the
  equipment on them last longer, and improve the comfort of
  unconditioned buildings.

• Generates significant economic and societal benefits by
  reducing heat and pollution related illness and death in urban
  areas.

• Helps us both mitigate and adapt to climate change risks.

                                                                     3
How Cool Roofs Work




                          Air Temperature 37°C (99°F)

  Cool surfaces are measured by how much light they reflect (Solar
Reflectance) and how efficiently they shed heat (Thermal Emittance).
                                                                  4
The Benefits: Cooler Buildings
• Cool roofs can cut energy use by 10 to 20 percent on the top
  floor of conditioned buildings – often avoiding cooling load at
  the most expensive times of the day.
   • UHI accounts for 5 – 10% of U.S. peak electricity demand for A/C.
   • 2-4% more demand per 1° C temperature increase above 20°C
   • $735 million in energy costs savings in the U.S. commercial buildings.

• Cooler surface temperatures may help the roof and the
  equipment on it last longer.

• Cool roofs improve the comfort and “live-ability” of
  unconditioned buildings.
                                                                              5
Electricity Load and Temperature

                                                                                              Data from New
                                                                                               Orleans, LA




Adapted from Sailor, D. J. 2002. Urban Heat Islands, Opportunities and Challenges for Mitigation and Adaptation. Sample
Electric Load Data for New Orleans, LA (NOPSI, 1995). North American Urban Heat Island Summit. Toronto, Canada. 1–4 May
2002. Data courtesy Entergy Corporation.                                                                                6
Electricity Load and Temperature




Source: Lawrence Berkeley National Lab   7
Cool Materials


   Reflectance of
  common roofing
  materials and the
temperature increase
  above ambient.




Source: Lawrence Berkeley National Laboratory Heat Island Group   8
Not just white
              Regal White              Rawhide               Slate Blue




             Standard SR .67     Standard SR .47       Standard SR .21
               Cool SR .72         Cool SR .56            Cool SR .33


                                                  Hartford                Slate Bronze
     Brick Red         Charcoal Gray
                                                   Green




   Standard SR .25     Standard SR .14       Standard SR .11              Standard SR .08
     Cool SR .30         Cool SR .28             Cool SR .28                Cool SR .26

                                                                                            9
Cool Colors
                                      UV    visible     near-infrared
                              1.0
                                                               Solar Irradiance Distribution
Normalized Solar Irradiance




                              0.9
                              0.8
                                                               ■ 6.6% ultraviolet (300 - 400 nm)
                              0.7                              ■ 44.7% visible (400 - 700 nm)
                              0.6                              ■ 48.7% near-infrared (700 - 2500 nm)
                              0.5
                              0.4
                              0.3
                                                                            Air Mass 1 Global Horizontal (AM1GH) Solar Irradiance
                              0.2
                              0.1
                              0.0
                                250        500        750   1000    1250   1500        1750          2000         2250          2500
                                                               Wavelength (nm)                                                         10
Trends in Cool Materials
• Staying cleaner, longer – improved aged material values

• More “cool” colors - expanding the broad set of available
  reflective color options

• Directional reflectivity - good for sloped roofs
        Brick Red     Charcoal Gray

• Clear reflective coatings – an option that balances reflectivity
  and aesthetics

                      Standard SR .14
                        Cool SR .28

                                                                     11
Trends in Cool Materials – continued
• Color-shifting materials – thermo- and electro-chromic (more
  focused on windows currently)

• Advances in testing – accelerated aging processes

• Pavements – longevity by material and application.
         Brick Red      Charcoal Gray

• Research – broaden geographic diversity of data, field testing,
  additional modeling and testing of large-scale climate benefits.

       Standard S .25   Standard SR .14
        Cool SR .30       Cool SR .28

                                                                     12
Strategies for Cool Communities




  Source: Lawrence Berkeley National Laboratory Heat Island Group   13
Roadmap for implementation
A preview of a guide being developed for R20 – Regions of Climate Action


                 Policies                              Programs
        (e.g., codes, ordinances,          (e.g., demonstrations, volunteer
                incentives)                   efforts, workforce training)




                              Foundation Activities
          (e.g., information gathering, building support and capacity)

                                                                              14
GCCA envisions a future in which our urban environments are
cooler, more resilient and more efficient. Join us!



Kurt Shickman
kurt@globalcoolcities.org
001-202-550-5852
GlobalCoolCities.org




                                                              15

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Cool Roofs: Cost Effective Technology for Better Buildings, Healthier Cities and a Cooler Planet

  • 1. Cool Roofs IEA Workshop November 17, 2011 Kurt Shickman kurt@globalcoolcities.org 001-202-550-5852 GlobalCoolCities.org
  • 2. Global Cool Cities Alliance (GCCA) The Global Cool Cities Alliance is dedicated to advancing policies and actions that increase the solar reflectance of our buildings and pavements as a cost-effective way to promote cool buildings, cool cities, and to mitigate the effects of climate change through global cooling. 2
  • 3. Cool surfaces are a high-impact, short-payback investment that: • Improves buildings by cutting net energy use, help roofs and the equipment on them last longer, and improve the comfort of unconditioned buildings. • Generates significant economic and societal benefits by reducing heat and pollution related illness and death in urban areas. • Helps us both mitigate and adapt to climate change risks. 3
  • 4. How Cool Roofs Work Air Temperature 37°C (99°F) Cool surfaces are measured by how much light they reflect (Solar Reflectance) and how efficiently they shed heat (Thermal Emittance). 4
  • 5. The Benefits: Cooler Buildings • Cool roofs can cut energy use by 10 to 20 percent on the top floor of conditioned buildings – often avoiding cooling load at the most expensive times of the day. • UHI accounts for 5 – 10% of U.S. peak electricity demand for A/C. • 2-4% more demand per 1° C temperature increase above 20°C • $735 million in energy costs savings in the U.S. commercial buildings. • Cooler surface temperatures may help the roof and the equipment on it last longer. • Cool roofs improve the comfort and “live-ability” of unconditioned buildings. 5
  • 6. Electricity Load and Temperature Data from New Orleans, LA Adapted from Sailor, D. J. 2002. Urban Heat Islands, Opportunities and Challenges for Mitigation and Adaptation. Sample Electric Load Data for New Orleans, LA (NOPSI, 1995). North American Urban Heat Island Summit. Toronto, Canada. 1–4 May 2002. Data courtesy Entergy Corporation. 6
  • 7. Electricity Load and Temperature Source: Lawrence Berkeley National Lab 7
  • 8. Cool Materials Reflectance of common roofing materials and the temperature increase above ambient. Source: Lawrence Berkeley National Laboratory Heat Island Group 8
  • 9. Not just white Regal White Rawhide Slate Blue Standard SR .67 Standard SR .47 Standard SR .21 Cool SR .72 Cool SR .56 Cool SR .33 Hartford Slate Bronze Brick Red Charcoal Gray Green Standard SR .25 Standard SR .14 Standard SR .11 Standard SR .08 Cool SR .30 Cool SR .28 Cool SR .28 Cool SR .26 9
  • 10. Cool Colors UV visible near-infrared 1.0 Solar Irradiance Distribution Normalized Solar Irradiance 0.9 0.8 ■ 6.6% ultraviolet (300 - 400 nm) 0.7 ■ 44.7% visible (400 - 700 nm) 0.6 ■ 48.7% near-infrared (700 - 2500 nm) 0.5 0.4 0.3 Air Mass 1 Global Horizontal (AM1GH) Solar Irradiance 0.2 0.1 0.0 250 500 750 1000 1250 1500 1750 2000 2250 2500 Wavelength (nm) 10
  • 11. Trends in Cool Materials • Staying cleaner, longer – improved aged material values • More “cool” colors - expanding the broad set of available reflective color options • Directional reflectivity - good for sloped roofs Brick Red Charcoal Gray • Clear reflective coatings – an option that balances reflectivity and aesthetics Standard SR .14 Cool SR .28 11
  • 12. Trends in Cool Materials – continued • Color-shifting materials – thermo- and electro-chromic (more focused on windows currently) • Advances in testing – accelerated aging processes • Pavements – longevity by material and application. Brick Red Charcoal Gray • Research – broaden geographic diversity of data, field testing, additional modeling and testing of large-scale climate benefits. Standard S .25 Standard SR .14 Cool SR .30 Cool SR .28 12
  • 13. Strategies for Cool Communities Source: Lawrence Berkeley National Laboratory Heat Island Group 13
  • 14. Roadmap for implementation A preview of a guide being developed for R20 – Regions of Climate Action Policies Programs (e.g., codes, ordinances, (e.g., demonstrations, volunteer incentives) efforts, workforce training) Foundation Activities (e.g., information gathering, building support and capacity) 14
  • 15. GCCA envisions a future in which our urban environments are cooler, more resilient and more efficient. Join us! Kurt Shickman kurt@globalcoolcities.org 001-202-550-5852 GlobalCoolCities.org 15