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Green Roofs
Hygrothermal Behaviour
Sara Freitas
Supervisor: Nuno Ramos
Co-supervisor: Hartwig Künzel
2017
PhD 2016 | 2
2016 CONSTRUCT PhD Workshop
UN 2009
2050 70% world population
World urbanization prospects
UN 2009
quantitative benefits evaluation
(building, “comfort” and city)
best technical and economic solution
PhD 2016 | 3
2016 CONSTRUCT PhD Workshop
Green roof hygrothermal modelling
Latent
heat
Sensible
heat
Long-wave
radiation
Heat and
moisture
fluxes
Short-wave
radiation
Short-wave
radiation
(reflections)
WUFI
PhD 2016 | 4
2016 CONSTRUCT PhD Workshop
Experimental assessment of green roofs performance
Green
Roof
Traditional
Roof
PhD 2016 | 5
2016 CONSTRUCT PhD Workshop
Water
content Temperature
Profile 1
Temperature
Profile 2
Heat fluxes
PhD 2016 | 6
2016 CONSTRUCT PhD Workshop
Temperature
Profile 2 Temperature
Profile 1
PhD 2016 | 7
2016 CONSTRUCT PhD Workshop
Measured Surface Temperatures
irrigation
PhD 2016 | 8
2016 CONSTRUCT PhD Workshop
Green Roof Numerical Simulations
Measured vs simulated – near surface temperature
without rain events
with irrigation events
PhD 2016 | 9
2016 CONSTRUCT PhD Workshop
Numerical Simulations
Simulated Surface Temperatures irrigation vs no irrigation
10ºC
Conclusions
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