The use of Vegetation for Social Housing Renovations: a...

The use of Vegetation for Social Housing Renovations:

a cases study in the city of Palermo

Luisa PastoreUniversità degli Studi di Palermo

Italy

Rossella CorraoUniversità degli Studi di Palermo

Italy

Per HeiselbergAalborg University

Denmark

� ENVIRONMENTAL BENEFITS

� SOCIAL BENEFITS

� ECONOMIC BENEFITS

Less CO2Mitigation of the outdoor temperature

Plants vs deep retrofit interventions

People social life improvement

Luisa Pastore, Phd Student at Università degli Studi di Palermo

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AIM OF THE RESEARCHDefinition of sustainable strategies for the environmental and energyrenovation of Social Housing complexes in temperate areas, in an attempt tocombine:

BUILDING SCALEBUILDING SCALE

INDOOR COMFORTINDOOR COMFORTURBAN MICROCLIMATE MITIGATION


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MICRO-URBAN SCALEMICRO-URBAN SCALE

OUTDOOR COMFORTOUTDOOR COMFORTBUILDINGS ENERGY RETROFIT

VEGETATION

METHODOLOGY

CURRENT STATE

ANALYSISmicro-urban and

building scale

MICRO-URBAN SCALE

SIMULATIONSUrban area 470x470 m2

BUILDING SCALE

SIMULATIONS5 Apartments

1 2 4

Integration of vegetation in

external spaces

3

DISTRICT SCALE

SIMULATIONS Residential area

110x375 m2


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To provide Microclimatic parameters

Tool: ENVI-met

Tool: EnergyPlus

To assess benefits of vegetation on OUTDOORCOMFORT

Tool: ENVI-met

AIMS:

To assess benefits of vegetation on

INDOORCOMFORT

MEDAGLIE D’ORO RESIDENTIAL COMPLEX IN PALERMODas Bild kann nicht angezeigt werden. Dieser Computer verfügt möglicherweise über zu wenig Arbeitsspeicher, um das Bild zu öffnen, oder das Bild ist beschädigt. Starten Sie den Computer neu, und öffnen Sie dann erneut die Datei. Wenn weiterhin das rote x angezeigt wird, müssen Sie das Bild möglicherweise löschen und dann erneut einfügen.


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1. CURRENT STATE ANALYSIS


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METHODOLOGY

CURRENT STATE


building scale

MICRO-URBAN SCALE


BUILDING SCALE


1 2 4


external spaces

3

DISTRICT SCALE


110x375 m2


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Tool: ENVI-met

Tool: EnergyPlus


Tool: ENVI-met

AIMS:


INDOORCOMFORT

2. MICRO-URBAN SCALE SIMULATIONS


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2. MICRO-URBAN SCALE SIMULATIONS

Similar trends can be noticed as for

temperature and direct solar radiation, while

significant differences can be noticed as for

the wind speed values in correspondence to

the four receptors


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METHODOLOGY

CURRENT STATE


building scale

MICRO-URBAN SCALE


BUILDING SCALE


1 2 4


external spaces

3

DISTRICT SCALE


110x375 m2


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Tool: ENVI-met

Tool: EnergyPlus


Tool: ENVI-met

AIMS:


INDOORCOMFORT

3. SIMULATION AT THE SCALE OF THE MEDAGLIE D’ORO CO MPLEX


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5 receptors taken into account to extract exact values of TEMPERATURE, WIND

SPEED and SOLAR RADIATION

Rec. A

Rec. B

Rec. C

Rec. D

Rec. E - h= 1,5m

h= 7,5m

IDVegetation

Typ.H (m) LAI (m2/m2)

A Tree 10 4.6

3. SIMULATION AT THE SCALE OF THE MEDAGLIE D’ORO CO MPLEXS

cena

rio 1

Sce

nario

2

In addition to the current situation,

4 DIFFERENT SCENARIOS were

simulated, considering progressive

addiction of vegetation with

different LAI values

A Tree 10 4.6

B Tree 10 1.175

C Tree 6 4.6

D Tree 15 1.75

Pl Tree 15 2.5

Sk Tree 15 6.5

Bu Hedge 2 5.9

G Grass 0.05 0.5

Gr Grass 0.10 3


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Sce

nario

3S

cena

rio 4

3. SIMULATION AT THE SCALE OF THE MEDAGLIE D’ORO CO MPLEXRESULTS

WINTER:

SUMMER:

• Irrelevant differences as for wind speed and temperature

• Considerable reduction of direct solar radiation in Sc. 2, 3 and 4

• Negligible wind speed variations



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• Significant decrease of temperature registered in correspondence

of receptors A and C, positioned near the buildings walls

overlooking the internal area of the complex, and for receptor E,

positioned in the open area.

3. SIMULATION AT THE SCALE OF THE MEDAGLIE D’ORO CO MPLEX


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METHODOLOGY

CURRENT STATE


building scale

MICRO-URBAN SCALE


BUILDING SCALE


1 2 4


external spaces

3

DISTRICT SCALE


110x375 m2


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Tool: ENVI-met

Tool: EnergyPlus


Tool: ENVI-met

AIMS:


INDOORCOMFORT

4. SIMULATION AT THE APARTMENT SCALE


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5 SCENARIOS SIMULATED:

• Current state

• Outside vegetation (as resulted from the previous stage)

• Outside vegetation + Substitution of windows (low-e glazing)

• Outside vegetation + Low-e glazing + Living walls

• Outside vegetation + Low-e glazing + Living walls + Green roof (only


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• Outside vegetation + Low-e glazing + Living walls + Green roof (only

for the top floor apartment)

3 DIFFERENT VENTILATION CONDITIONS CONSIDERED:

• Closed Doors and Windows

• Closed Doors and Open Windows

• Open Doors and Open Windows



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• Outside vegetation

• Low-e glazing

+ Living Walls

∆T≈ 3°C

∆T≈ 1,3°C

CONCLUSIONS

The research show the effectiveness of the integration of plants with the built

environment for:

• The microclimate mitigation and the enhancement of the OUTDOOR COMFORT

(∆T up to 3°C)

• The improvement of building performance and of INDOOR COMFORT

(∆T up to 4,3°C)


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and demonstrate the importance of deeper approaches for high accuracy

investigations on real urban and building scale thermal comfort levels.

Further researches are being held to:

• Assess the effect of the use of vegetation also in other Social Housing complexes

of the city of Palermo (with different environmental conditions)

• To validate it also in a COST-BENEFIT PERSPECTIVE

Luisa PastoreUniversità degli Studi di Palermo

Italy


[email protected]

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