Energy factors and temporary distribution in insulated built-up roofs
Abstract
Surface temperatures of 4-ply built-up roofs insulated with (1) 1 inch of perlite (R = 2.8) and 2-1/2 inches of urethane (R = 19.2) and (2) 1 inch of urethane (R = 7.1) and 1-7/8 inches of glass fiber (R = 7.7) are presented. Energy factors are shown in terms of temperature-time areas defined as solar heat response, cooling (heating) required, radiative cooling, and insulation efficiency. Results indicate that for a black surface, solar heat response is significantly higher in the roof portion with the higher R-value. Solar heat response is directly affected by color of surfacing; lowest to highest values were found with white, white gravel, gray gravel, aluminum-gray, and black. Recommendations are given for reducing surface temperatures of insulated built-up roofs.
- Publication:
-
Technical Note
- Pub Date:
- February 1981
- Bibcode:
- 1981ncel.rept.....K
- Keywords:
-
- Roofs;
- Temperature Distribution;
- Thermal Insulation;
- Color;
- Cooling;
- Energy Conservation;
- Solar Energy;
- Engineering (General)