Report Number

FSEC-PF-412-06

URL

http://publications.energyresearch.ucf.edu/wp-content/uploads/2018/06/FSEC-PF-412-06.pdf

Keywords

Roofs; Buildings; Green roofs; Energy performance; Roof temperatures; Heat flux; Building energy efficiency

Abstract

Previous green roof studies have found that planted roofs significantly reduce roof temperatures and roof heat flux, and simulations indicate cooling load reductions of up to 25%. This monitored study evaluates summer and winter energy performance aspects of a green roof on a central Florida university building addition that was completed in 2005.

Analysis of 2005 summer data indicates significantly lower peak roof surface temperatures for the green roof compared with the conventional roof and a significant shift in when the peak temperature occurs compared to the conventional roof. Summer roof heat flux estimates show the green roof to have an average heat flux of 0.39 Btu/ft2 /hr or 18.3% less than the conventional roof's average heat flux rate of 0.48 Btu/ft2 /hr.

Winter data again show significantly lower peak roof surface temperatures and higher nighttime surface temperatures for the green roof. For periods during which the ambient temperature was less than 55° F, the weighted average winter heat flux rate for the green roof is -0.40 Btu/ft2 /hr or 49.5% less than the conventional roof's average heat flux rate of -0.79 Btu/ft2 /hr.

Date Published

7-24-2006

Identifiers

499

Notes

Reference Publication: Sonne, J., "Energy Performance Apsects of a Florida Green Roof"., Fifteenth Symposium on Improving Building Systems in Hot and Humid Climates, July 24­26, 2006 Orlando, FL.

Subjects

Green roofs (Gardening); Buildings--Energy conservation; Roofs; Energy consumption; Temperature control

Local Subjects

Buildings - Roofs

Type

Text; Document

Collection

FSEC Energy Research Center® Collection

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