- Author
-
Cottony, H. V.
|
Dill, R. S.
- Title
- Solar Heating of Various Surfaces.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
-
BMS 64
January 23, 1941
7 p.
- Keywords
-
solar energy
|
heating
|
temperature
|
paints
|
roofing (finishes)
|
aluminum foil
- Abstract
- Measurements were made on the temperatures attained by a number of painted and other surfaces exposed to the sun, and it was found taht surfaces covered with white or light-colored paint remained cooler under this condition than those covered with dark paint. A surface covered with glossy white paint was cooler than any other tried, while one covered with flat white paint was nearly as cool. A lampblack surface was the warmest of the surfaces tried, and one covered with green trim paint was nearly as warm. The temperature attained by surfaces painted with various shades of gray, yellow, and ivory paint fell between those reached by the white and the green surfaces. Three colors of commercial roll roofing material - aluminum, green, and red - were tried, and all attained temperatures practically as high as the green or the lampblack surfaces. A surface covered with aluminum foil was cooler than antother covered with aluminum paint but was considedrably warmer than the white painted surfaces. All the surfaces were shown to be cooled below the ambient air temperature on clear nights by radiation to the sky. The surfaces covered with house paints were all cooled about the same amount under this condition, regardless of color, and they were cooled more than the other surfaces tried, whereas the aluminum foil-covered surface was cooled the least.