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