Performance monitoring of three ecoroofs in Portland,Oregon |
| |
Authors: | Graig Spolek |
| |
Institution: | (1) Mechanical and Materials Engineering Department, Portland State University, P.O. Box 751, Portland, OR 97207, USA |
| |
Abstract: | Ecoroofs, also known as green roofs, are becoming widely installed with relatively little data collected on their in situ
performance. For this study, three large ecoroof portions (280–500 m2) located on two different buildings in Portland, OR, USA were instrumented and monitored continuously for more almost 3 years.
For the Broadway Building, a student dormitory on the campus of Portland State University, measurement of ecoroof energy conservation
and rainwater discharge abatement helped qualify the building for its Leadership in Energy and Environmental Design silver
award. Using an electromagnetic flowmeter, stormwater discharge was monitored and compared to rainfall. Over a 3-year period,
rainwater discharge was reduced by about 25%. Rooftop heat flux was simultaneously measured using an array of temperature
sensors. When compared to a rock ballast roof exposed to the same weather conditions, the ecoroof heat flux was reduced by
13% in winter and 72% in summer. Retrofit ecoroof installations on the Multnomah County Building, an office building, were
also monitored for almost 3 years for two separate ecoroof sections with different plantings, using similar electromagnetic
flow meters and a rain gauge. Overall reductions of rainwater discharge were 12% and 17% for those two ecoroofs. For all three
ecoroofs, discharge reductions varied widely by month due to seasonal differences in the amount of rainfall. Based on the
measurements taken in this study, ecoroofs in Portland, OR, USA appear to offer some performance advantages. |
| |
Keywords: | Ecoroof Monitoring Stormwater Energy |
本文献已被 SpringerLink 等数据库收录! |
|