8/6/2019 Environmental thermal impact assessment of regenerated urban form: A case study in Sheffield, UK - Presentation

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Mohammad Fahmy, Abigail Hathway, Laurence Pattacini and Amr Elwan

Environmental thermal impac t assessment of

regenerated urban form:A case study in Sheffield

Environmental thermal impac t assessment of

regenerated urban form:A case study in Sheffield

"there are significant social, economic and environmental gains to be made

by integrated and innovative interventions in urban river corridors"

8/6/2019 Environmental thermal impact assessment of regenerated urban form: A case study in Sheffield, UK - Presentation

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URSULA is an exciting project investigating the sustainable

development of urban river corridors taking the area ofthe River Done in Sheffield as a case study.

Introduction

This study is part of the work of URSULA urban form design groupwhich assessing the proposed regenerated forms and

studying their microclimatic impact are among

their authentic duties

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Regenerated Urban Forms

Existing site is designed to provide cooling from the river bythe tunneling effects of the form perpendicular to the river,

this is Case no.1.

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Regenerated Urban Forms

On the other hand, mitigating River Done floods as a

climate change symptom revealed design case no.2.

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Methodology

Base caseBase caseDesign no.1Design no.1 Design no.2Design no.2

The ENVI-met urban microclimatic model is used to assess the

thermal impacts of both design cases and the base case.

R3

R4

R1

R2

R3

R4

R1

R2

R3

R4R1

R2

Outdoor conditions were recorded at 4 receptor points.

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8/6/2019 Environmental thermal impact assessment of regenerated urban form: A case study in Sheffield, UK - Presentation

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Example comparison of averaged Ta

and the receptors outputs for

different cases.

Results

8/6/2019 Environmental thermal impact assessment of regenerated urban form: A case study in Sheffield, UK - Presentation

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Urban thermal mass

It is the effect of both fabric and vegetation or one of them in delaying urbanheat gain or loss. This consequents a time delay called urban time lag.

-0.7

-0.2

0.3

0.8

1.3

1.8

2.3

2.8

3.3

8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00

PMV

C1R4(SVF0.892) C1PMV_Averaged C2PMV_Averaged BCPMV_Averaged

C2R4(SVF0.852) BCR4(SVF0.936)

Averaged PMV for both designs

showed reductions from base case and

validated receptor records.

Peak ofBC & C1

Peak of

C2

1 hour shift of urban time lag.

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Conclusions

Regardless the different climatic region in (Fahmy 2010), urban

thermal mass definition was due to the effect of both thecompact fabric and dense vegetation in a hot arid region.

In this work, it appears that the definition can be modified to be

the effect of both fabric and vegetation OR one of them indelaying urban heat gain or loss in a temperate region.

After all, the second design showed more reductions in heatgain compared with both the base case and design alternative

no. 1

Thanks