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Abstract
The impact of white roof coatings on energy loads in three nonresidentiall buildings in Sacramento was assessed using a new approach to statistical analysis. Hourly metered loads were designed to isolate the effects of white roof coating on building cooling loads from changes in cooling loads due to variations in outdoor temperature. For this analysis, the basic multiple linear regression model used to weather normalize energy consumption data was expanded to include hourly solar radiation or insolation levels as explanatory variables, along with explanatory variables representing outdoor temperatures. With this statistical modeling approach, the effect of white roofs can be isolated from changes due to variations in outdoor temperatures based on the decrease in regression coefficients representing the effect of solar radiation levels on cooling loads after application of whtie roofs. Results indicate that the effect of solar insolation levels on cooling energy consumption was significantly decreased after the application based on this approach from 17% to 39% of total cooling loads, or .35kWh to .68 kWh per square fot of treated roof area per year.
The impact of white roof coatings on energy loads in three nonresidentiall buildings in Sacramento was assessed using a new approach to statistical analysis. Hourly metered loads were designed to isolate the effects of white roof coating on building cooling loads from changes in cooling loads due to variations in outdoor temperature. For this analysis, the basic multiple linear regression model used to weather normalize energy consumption data was expanded to include hourly solar radiation or insolation levels as explanatory variables, along with explanatory variables representing outdoor temperatures. With this statistical modeling approach, the effect of white roofs can be isolated from changes due to variations in outdoor temperatures based on the decrease in regression coefficients representing the effect of solar radiation levels on cooling loads after application of whtie roofs. Results indicate that the effect of solar insolation levels on cooling energy consumption was significantly decreased after the application based on this approach from 17% to 39% of total cooling loads, or .35kWh to .68 kWh per square fot of treated roof area per year.
Date
2/1998
2/1998
Author(s)
Eric Hildebrandt; Wilem Bos; Robert Moore
Eric Hildebrandt; Wilem Bos; Robert Moore
Page(s)
Keyword(s)
white roof; energy; ASHRAE; cool roofs; energy load;
white roof; energy; ASHRAE; cool roofs; energy load;