Abstract
In 2002, the National Research Council and the City of Toronto collaborated on a multi-year study on green roof technology to provide local thermal and stormwater runoff data. The study was part of a larger project to asses the quantifiable environmental and social benefits of green roofs. This paper provided technical data on the performance of 2 extensive green roof systems installed by the NRC on a community centre in Toronto. Magnetic flowmeters were installed on the green roofs to measure runoff. Three roof sections were instrumented to measure the temperature profile within and heat flow across the roofing systems, and the microclimate created by the vegetation and stormwater runoff. A weather station was installed on the rooftops to monitor atmospheric conditions. The roof drainage systems were retrofitted so that runoffs from the 3 roof sections were directed into individual magnetic flowmeters for measurement. All sensors were connected to a data acquisition system for continuous monitoring. Flow volumes from the test plots provided an average annual reduction of 57 per cent compared to a control roof that was not planted. Results of the study showed that green roofs are effective in reducing heat flow through the roofing system. Although vegetation
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Citation Formats
Liu, K, and Minor, J.
Performance evaluation of an extensive green roof.
Canada: N. p.,
2005.
Web.
Liu, K, & Minor, J.
Performance evaluation of an extensive green roof.
Canada.
Liu, K, and Minor, J.
2005.
"Performance evaluation of an extensive green roof."
Canada.
@misc{etde_20861922,
title = {Performance evaluation of an extensive green roof}
author = {Liu, K, and Minor, J}
abstractNote = {In 2002, the National Research Council and the City of Toronto collaborated on a multi-year study on green roof technology to provide local thermal and stormwater runoff data. The study was part of a larger project to asses the quantifiable environmental and social benefits of green roofs. This paper provided technical data on the performance of 2 extensive green roof systems installed by the NRC on a community centre in Toronto. Magnetic flowmeters were installed on the green roofs to measure runoff. Three roof sections were instrumented to measure the temperature profile within and heat flow across the roofing systems, and the microclimate created by the vegetation and stormwater runoff. A weather station was installed on the rooftops to monitor atmospheric conditions. The roof drainage systems were retrofitted so that runoffs from the 3 roof sections were directed into individual magnetic flowmeters for measurement. All sensors were connected to a data acquisition system for continuous monitoring. Flow volumes from the test plots provided an average annual reduction of 57 per cent compared to a control roof that was not planted. Results of the study showed that green roofs are effective in reducing heat flow through the roofing system. Although vegetation coverage was minimal during the first year of establishment, the 2 green roof systems reduced heat flow by between 70 and 90 per cent in the summer, and by 10 to 30 per cent in the winter. Daily temperature fluctuations experienced by the roof membranes were reduced by 30 degrees C. Significant reductions in stormwater runoff volume and rates of flow were observed. It was concluded that the reductions of peak flow and detention time may also provide some benefits in the form of reduced infrastructure capacity needs. 8 figs.}
place = {Canada}
year = {2005}
month = {Jul}
}
title = {Performance evaluation of an extensive green roof}
author = {Liu, K, and Minor, J}
abstractNote = {In 2002, the National Research Council and the City of Toronto collaborated on a multi-year study on green roof technology to provide local thermal and stormwater runoff data. The study was part of a larger project to asses the quantifiable environmental and social benefits of green roofs. This paper provided technical data on the performance of 2 extensive green roof systems installed by the NRC on a community centre in Toronto. Magnetic flowmeters were installed on the green roofs to measure runoff. Three roof sections were instrumented to measure the temperature profile within and heat flow across the roofing systems, and the microclimate created by the vegetation and stormwater runoff. A weather station was installed on the rooftops to monitor atmospheric conditions. The roof drainage systems were retrofitted so that runoffs from the 3 roof sections were directed into individual magnetic flowmeters for measurement. All sensors were connected to a data acquisition system for continuous monitoring. Flow volumes from the test plots provided an average annual reduction of 57 per cent compared to a control roof that was not planted. Results of the study showed that green roofs are effective in reducing heat flow through the roofing system. Although vegetation coverage was minimal during the first year of establishment, the 2 green roof systems reduced heat flow by between 70 and 90 per cent in the summer, and by 10 to 30 per cent in the winter. Daily temperature fluctuations experienced by the roof membranes were reduced by 30 degrees C. Significant reductions in stormwater runoff volume and rates of flow were observed. It was concluded that the reductions of peak flow and detention time may also provide some benefits in the form of reduced infrastructure capacity needs. 8 figs.}
place = {Canada}
year = {2005}
month = {Jul}
}