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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7.2 Green Ro<strong>of</strong> Energy Bal<strong>an</strong>ce<strong>The</strong> green ro<strong>of</strong> energy bal<strong>an</strong>ce for extensive green ro<strong>of</strong>s proposed by Feng et al. [38] isestablished with the following prequisites:• <strong>The</strong> lawn, with 100% leaf coverage, is considered as a diffuse grey body.• <strong>The</strong>rmal effects <strong>of</strong> pl<strong>an</strong>ts metabolism - except for photosynthesis, respiration <strong><strong>an</strong>d</strong>tr<strong>an</strong>spiration – <strong><strong>an</strong>d</strong> thermal effects <strong>of</strong> microorg<strong>an</strong>isms in the soil are negligible.• <strong>The</strong> conditions with precipitation <strong><strong>an</strong>d</strong> dew are not included.• <strong>The</strong> green ro<strong>of</strong> is large enough to assume horizontal homogeneity <strong><strong>an</strong>d</strong> apply onedimensional (vertical) <strong>an</strong>alysis.<strong>The</strong> energy exch<strong>an</strong>ge between <strong>an</strong> extensive green ro<strong>of</strong> <strong><strong>an</strong>d</strong> its surrounding environment isillustrated as follows:Figure 37: Energy Exch<strong>an</strong>ge between <strong>an</strong> <strong>Extensive</strong> Green Ro<strong>of</strong> <strong><strong>an</strong>d</strong> its EnvironmentUsing the first law <strong>of</strong> thermodynamics, the following energy bal<strong>an</strong>ce equation is obtained:Niall Carroll Page 57<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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