
| Title | Methods of creating solar-reflective nonwhite surfaces and their application to residential roofing materials |
| Publication Type | Journal Article |
| Year of Publication | 2007 |
| Authors | Levinson, Ronnen M., Paul Berdahl, Hashem Akbari, William A. Miller, I. Joedicke, Joseph C. Reilly, Yoshi Suzuki, and M. Vondran |
| Journal | Solar Energy Materials and Solar Cells |
| Volume | 91 |
| Pagination | 304-314 |
| Keywords | Heat Island, Methods & Protocols |
| Abstract | We describe methods for creating solar-reflective nonwhite surfaces and their application to a wide variety of residential roofing materials, including metal, clay tile, concrete tile, wood, and asphalt shingle. Reflectance in the near-infrared (NIR) spectrum (0.7-2.5 μm) is maximized by coloring a topcoat with pigments that weakly absorb and (optionally) strongly backscatter NIR radiation, and by adding an NIR-reflective basecoat (e.g., one colored with titanium dioxide rutile white) if both the topcoat and the substrate weakly reflect NIR radiation. Coated steel and glazed clay-tile roofing products achieved NIR reflectances of up to 0.50 and 0.75, respectively, using only cool topcoats. Gray-cement concrete tiles achieved NIR reflectances as high as 0.60 with coatings colored by NIR-scattering pigments. Such tiles could attain NIR reflectances of up to 0.85 by overlaying a white basecoat with a topcoat colored by NIR-transparent organic pigments. Granule-surfaced asphalt shingles achieved NIR reflectances as high as 0.45 when the granules were covered with a white basecoat and a cool color topcoat. |
| Notes | 0927-0248Added to JabRef: 2010.04.19 |
| URL | http://dx.doi.org/10.1016/j.solmat.2006.06.062 |
| DOI | DOI: 10.1016/j.solmat.2006.06.062 |