Скачать презентацию Special Infrared Reflective Pigments Make Dark Roofs Reflect Скачать презентацию Special Infrared Reflective Pigments Make Dark Roofs Reflect

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Special Infrared Reflective Pigments Make Dark Roofs Reflect Almost Like White Roofs Performance of Special Infrared Reflective Pigments Make Dark Roofs Reflect Almost Like White Roofs Performance of Exterior Envelopes of Whole Buildings IX December 9, 2004 Ken Loye, Scott Kriner, Bob Scichili INDUSTRY L RN L N H. Akbari, P. Berdahl, R. Levinson, S. Wiel O LB COLLABORATIVE R&D CEC DOE Chris Scruton Marc Lafrance W. Miller, A. Desjarlais

Project Goals • Bring cool colored roofing materials to market • Accelerate market penetration Project Goals • Bring cool colored roofing materials to market • Accelerate market penetration of cool metal, tile, wood shake, and shingle products • Measure and document laboratory and in-situ performance of roofing products • Measure and document improvements in the durability of roofing expected to arise from lower operating temperatures

Project Team LBNL ORNL – Steve Wiel – André Desjarlais (Project Director) yt 7@ORNL. Project Team LBNL ORNL – Steve Wiel – André Desjarlais (Project Director) yt [email protected] gov [email protected] gov – Bill Miller – Hashem Akbari [email protected] gov [email protected] gov – Paul Berdahl [email protected] gov – Ronnen Levinson [email protected] gov

Why are the Cool Roof Color Materials (CRCM) Cooler? Why are the Cool Roof Color Materials (CRCM) Cooler?

Identified and Characterized Pigments w/High Solar Reflectance LBNL • Database online at http: //Cool. Identified and Characterized Pigments w/High Solar Reflectance LBNL • Database online at http: //Cool. Colors. LBL. gov – contact R. Levinson for more info • Describes 233 pigmented CRCM coatings – – 87 masstones (pure colors) 57 ratio 1: 4 tints (new!) 57 ratio 1: 9 tints (new!) 32 ratio 1: 1 nonwhite mixtures (new!) • Possible future additions – ratio 1: 4, 4: 1 nonwhite mixtures

Characterized Nonwhite Mixtures Cool Color Combinations LBNL • Prepared, characterized nonwhite mixtures – equal Characterized Nonwhite Mixtures Cool Color Combinations LBNL • Prepared, characterized nonwhite mixtures – equal volumes of each color paint – Computed Kubelka-Munk absorption and scattering coefficients (K, S) • Coating design software requires – database of pigment properties (ready) – optimization algorithm (to be chosen) – model for absorption, scattering of mixture • Simple volumetric model: each component contributes volumetrically to absorption K and scattering S of mix Kmix = ∑ ci Ki Smix = ∑ ci Si where ci = volume fraction of component i

Developing Prototype Cool Dark Brown Shingle (representative image) LBNL • Matches standard dark brown Developing Prototype Cool Dark Brown Shingle (representative image) LBNL • Matches standard dark brown shingle • Solar reflectance SR > 0. 2 • Next version may achieve SR > 0. 25 (Energy Star) ORNL

Coo. L Tile IR Coating. TM Applied to Concrete Tile ORNL LBNL COOL TILE Coo. L Tile IR Coating. TM Applied to Concrete Tile ORNL LBNL COOL TILE IR COATING™ technology was developed by Joe Reilly of American Rooftile Coatings

COOL CEDAR SHAKES POSE POTENTIAL IMPROVEMENT IN FIRE RATING ORNL Cedar Shake roof 16 COOL CEDAR SHAKES POSE POTENTIAL IMPROVEMENT IN FIRE RATING ORNL Cedar Shake roof 16 -yrs of exposure John Goveia (TRS) Martinez, CA LBNL

COOL PAINTED METAL WITH PVDF “polyvinylidene fluoride” base coat ORNL LBNL SR boosted a COOL PAINTED METAL WITH PVDF “polyvinylidene fluoride” base coat ORNL LBNL SR boosted a factor of 6 greater than dark roofing

Accelerated Weathering to Check Pigment Fade Resistance ORNL LBNL Total Color Difference measure E Accelerated Weathering to Check Pigment Fade Resistance ORNL LBNL Total Color Difference measure E

Three Years of Field Exposure in Florida Shows Improved Fade Resistance ORNL Painted PVDF Three Years of Field Exposure in Florida Shows Improved Fade Resistance ORNL Painted PVDF metals

Field-testing at Cavalli Hills Subdivision Fair Oaks, CA ORNL Finished with Low-profile Concrete Tile Field-testing at Cavalli Hills Subdivision Fair Oaks, CA ORNL Finished with Low-profile Concrete Tile and Stucco House-3 4987 Mariah Place COOL TILE IR COATING™ 41% reflective House-1 4979 Mariah Place

Cool Coating on Concrete Tile Reduces Heat Flux Through Ceiling ORNL Drops Attic Temperature Cool Coating on Concrete Tile Reduces Heat Flux Through Ceiling ORNL Drops Attic Temperature ~4 o. C (7 o. F) at Solar Noon

Field-testing at Cavalli Hills Subdivision Fair Oaks, CA ORNL Finished with Painted Metal Shingles Field-testing at Cavalli Hills Subdivision Fair Oaks, CA ORNL Finished with Painted Metal Shingles and Stucco House-4 4991 Mariah Place South facing roof Ultra Cool 31% reflectance House-2 4983 Mariah Place

Cool Coating Reduces Heat Flux Through South Facing Roof Deck ORNL Painted Metal Roofs Cool Coating Reduces Heat Flux Through South Facing Roof Deck ORNL Painted Metal Roofs

Materials Testing at CA Exposure Sites ORNL Clay and Painted Metal exposed for 1½ Materials Testing at CA Exposure Sites ORNL Clay and Painted Metal exposed for 1½ years

Rawhide and Slate Bronze Painted Metal Solar Reflectance ORNL Climatic zone affects loss of Rawhide and Slate Bronze Painted Metal Solar Reflectance ORNL Climatic zone affects loss of reflectance

Airborne Pollutants Appear to have a Strong Effect on the Loss of Reflectance ORNL Airborne Pollutants Appear to have a Strong Effect on the Loss of Reflectance ORNL Loss of reflectance changes with roof slope White Buff Clay Tile

Mission Tiles Yield the Lowest Roof Heat Flux and Attic Air Temperature Synergism observed Mission Tiles Yield the Lowest Roof Heat Flux and Attic Air Temperature Synergism observed between SR and batten – counter batten venting

Attic. Sim tool predicts thermal performance of residential attics Reflectance and emittance Ceiling and Attic. Sim tool predicts thermal performance of residential attics Reflectance and emittance Ceiling and roof insulation Attic Ventilation Roof Orientation Roof slope Roof thermal mass Moisture (external and internal) Deck ventilation

Atticsim Predicts Attic Ventilation within Range of Literature Data Atticsim Predicts Attic Ventilation within Range of Literature Data

Attic. Sim Validation for Direct Nailed Shingle Roof tested on ESRA Attic. Sim Validation for Direct Nailed Shingle Roof tested on ESRA

Potential Energy Savings Gained for Painted Metal Implementing CRCMs R-19 Ceiling Insulation (IECC, 2000) Potential Energy Savings Gained for Painted Metal Implementing CRCMs R-19 Ceiling Insulation (IECC, 2000)

In more moderate climates the heating load penalty offsets the cooling energy savings CRCMs In more moderate climates the heating load penalty offsets the cooling energy savings CRCMs do not yield an energy savings in cold climates

Savings based on the incremental gains over an SR 08 E 80 roof with Savings based on the incremental gains over an SR 08 E 80 roof with R-19 insulation in Dallas electricity $0. 10 per k. Wh; natural gas $10. 00 per 1000 ft 3

Savings are based on the incremental gains over an SR 08 E 80 roof Savings are based on the incremental gains over an SR 08 E 80 roof with R 13 insulation in Miami electricity $0. 10 per k. Wh; natural gas $10. 00 per 1000 ft 3

SUMMARY COOL ROOF COLOR MATERIALS Characterized and Identified “Cool Colors” Web database describes 233 SUMMARY COOL ROOF COLOR MATERIALS Characterized and Identified “Cool Colors” Web database describes 233 pigmented coatings Developing engineering methods to apply them for optimum reflectance Demonstration sites proving energy savings generated by “Cool Colors” Tile, Metal, Asphalt shingle, Cedar Shake Attic Assembly on ESRA at ORNL Field exposure sites in California Benefits from infrared pigment study Energy savings for homeowners and businesses Mitigate CO 2 emissions polluting environment Utilities will cut peak demands

Cool Colors Project Website • Project information (including copies of this presentation) available online Cool Colors Project Website • Project information (including copies of this presentation) available online at http: //Cool. Colors. LBL. gov