Review of research: Creating cooler communities and cooler products - - PowerPoint PPT Presentation

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Review of research: Creating cooler communities and cooler products - - PowerPoint PPT Presentation

Sep 24, 2023 406 likes •548 views

Review of research: Creating cooler communities and cooler products Haley Gilbert Principal Research Associate Heat Island Group Environmental Energy Technologies Division HEGilbert@LBL.gov +1-510-486-7325 Cool Surfaces for Energy Efficient

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Review of research: Creating cooler communities and cooler products

Haley Gilbert

Principal Research Associate Heat Island Group Environmental Energy Technologies Division HEGilbert@LBL.gov +1-510-486-7325

Cool Surfaces for Energy Efficient Buildings Conference Mexico City, Mexico | February 28, 2012

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Cool Surface Conference | Feb. 28 2

Works to cool buildings, cities, and the planet by making roofs, pavements, and cars cooler in the sun.

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Cool Surface Conference | Feb. 28 3

CA Title 24 Building Energy Efficiency Standards – Cool Roof requirements

  • Low-slope commercial buildings (first required in 2005)
  • Pitched residential buildings (first required in 2008/2011)
  • Requirements vary between 16 CA building climate zones

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Aged Solar Reflectance Aged Thermal Emittance Aged SRI 0.55 0.75 64 Aged Solar Reflectance Aged Thermal Emittance Aged SRI 0.20 (0.15 tiles) 0.75 16 (10 tiles)

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Cool Surface Conference | Feb. 28 4

What

Develop “cool community” programs in California (cool roofs, cool pavements, urban vegetation)

Why

Save energy, reduce emission of greenhouse gases, and improve the urban environment

How

Conduct research & technical assistance to help communities with program implementation & adoption

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Cool Surface Conference | Feb. 28 5

Cool pavement demo Investigating:

  • 1. Heat flow
  • 2. Solar reflectance
  • 3. Temperature

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Cool Surface Conference | Feb. 28 6

Consumer cool roof website

Presenting:

  • Science
  • Building codes &

rebates

  • Roof product search
  • Energy savings tool
  • Stories/case studies

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http://CoolCalifornia/cool-roofs

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Cool Surface Conference | Feb. 28 7

What

Reduce time to achieve 3-year aged solar reflectance (SR) ratings for cool roof building codes & rebates

Why

Benefits of cool roofs depend on long term SR & need to introduce new technologies to market quickly

How

Draft laboratory protocols to mimic natural aging

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Cool Surface Conference | Feb. 28 8

Natural exposure decreases SR – up to 40%

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

3 years aged solar reflectance (CRRC) Initial solar reflectance

0.33 0.01 0.15 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.75 0.80 0.85 0.90 0.95 1.00

Absolute loss of solar reflectance Initial solar reflectance

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Cool Surface Conference | Feb. 28 9

Natural Exposure “Aging” Soiling

Dirt + microbial growth

Weathering

UV, Heat, Moisture

What causes loss in solar reflectance?

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Cool Surface Conference | Feb. 28 10 10

Accelerated protocols close match to nature

OH (3 yr) SR = 0.71 Lab (3 days) SR = 0.69

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 250 500 750 1000 1250 1500 1750 2000 2250 2500 Reflectance Wavelength (nm)

Unexposed Ohio (3 yr) W+S+W (3 days)

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Cool Surface Conference | Feb. 28 11

  • Global cooling

modeling & field experiments

  • Development of

new “stay clean” products & more reflective asphalt shingles

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Cool Surface Conference | Feb. 28 12

  • Cool surfaces for

school yards

  • Demonstration cool

pavement projects for roads & parking lots

  • Models to estimate

benefits of cool pavement & roof projects in communities

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Cool Surface Conference | Feb. 28 13

http://HeatIsland.LBL.gov