The Thermal and Rainwater Runoff Performance of an Extensive ...
The Thermal and Rainwater Runoff Performance of an Extensive ...
The Thermal and Rainwater Runoff Performance of an Extensive ...
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temperatures. A time lag between the cooling <strong>of</strong> the sedum bl<strong>an</strong>ket <strong><strong>an</strong>d</strong> the ambient air <strong><strong>an</strong>d</strong>under ro<strong>of</strong> c<strong>an</strong> also be seen from figure 41.<strong>The</strong> moisture content for test 2 was also 15 – 20 %.8.13 Energy Bal<strong>an</strong>ceDue to the time constraints <strong>of</strong> the project, <strong>an</strong> energy bal<strong>an</strong>ce could not be carried out for tests1 <strong><strong>an</strong>d</strong> 2. <strong>The</strong> setup required to obtain the additional data for <strong>an</strong> accurate energy bal<strong>an</strong>ce (suchas incident solar radiation <strong><strong>an</strong>d</strong> wind speed above the test rig) were also beyond the scope/timeframe <strong>of</strong> this project.8.2 <strong>Rainwater</strong> <strong>Run<strong>of</strong>f</strong> <strong>Perform<strong>an</strong>ce</strong><strong>The</strong> first artificial rain event was set for <strong>an</strong> intensity <strong>of</strong> 1 mm/min <strong><strong>an</strong>d</strong> the duration <strong>of</strong> this was20 minutes. <strong>The</strong>refore the total rainfall was 20 mm.Green Ro<strong>of</strong> <strong><strong>an</strong>d</strong> PV P<strong>an</strong>el <strong>Run<strong>of</strong>f</strong> <strong>Perform<strong>an</strong>ce</strong>25Rain/<strong>Run<strong>of</strong>f</strong> (mm)20151050Rainfall (mm)Green Ro<strong>of</strong><strong>Run<strong>of</strong>f</strong>PV P<strong>an</strong>el<strong>Run<strong>of</strong>f</strong>062481012141618202224262830Time (mins)Figure 43: Green Ro<strong>of</strong> <strong><strong>an</strong>d</strong> PV P<strong>an</strong>el <strong>Run<strong>of</strong>f</strong> <strong>Perform<strong>an</strong>ce</strong> for 1 mm/min Rain EventAs c<strong>an</strong> be seen from figure 43, run<strong>of</strong>f occurs from the green ro<strong>of</strong> after 9 minutes – requiring9 mm <strong>of</strong> rainfall for run<strong>of</strong>f to occur. <strong>Run<strong>of</strong>f</strong> from the PV p<strong>an</strong>el occurs almost immediatelyNiall Carroll Page 66<strong>The</strong> <strong>The</strong>rmal <strong><strong>an</strong>d</strong> <strong>Rainwater</strong> <strong>Run<strong>of</strong>f</strong> <strong>Perform<strong>an</strong>ce</strong> <strong>of</strong> <strong>an</strong> <strong>Extensive</strong> Green Ro<strong>of</strong> System
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