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Do green roofs cool the air?
Anna Solcerova Frans van de Ven Mengyu Wang Michiel Rijsdijk Nick van de Giesen
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7 extensive green roofs and 2 traditional roofs (gravel and black) in Utrecht
Measured: temperature inside the green roofs temperature 15 and 30 cm above soil moisture (2 roofs) runoff weather station: rain volume, temperature, wind, and solar radiation
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Cooling effect in relation to soil moisture
Cloudy days Clear sky days Soil moisture Ts Air temperature 15cm above roof (T15) Two green roofs (GR4 “•” and GR7 “▼”) White gravel roof as reference
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Dry year vs. “normal” year
Air temperature 30 cm above Air temperature 15 cm above Soil temperature (-2.5 cm)
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Conclusions Know your aim! Know what are you measuring
Know your plants Know your aim! Avg. diff = - 0,04OC Avg. diff = + 0,03OC
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Thank you! Questions? For more details: Solcerova Anna, et al. "Do green roofs cool the air?." Building and Environment 111 (2017):
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