SIUE Green Roof Environmental Evaluation Network Susan Morgan, - - PowerPoint PPT Presentation

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SIUE Green Roof Environmental Evaluation Network Susan Morgan, - - PowerPoint PPT Presentation

Sep 17, 2023 38 likes •453 views

SIUE Green Roof Environmental Evaluation Network Susan Morgan, Ph.D., P .E. Professor of Civil Engineering and Associate Dean of Graduate School William Retzlaff, Ph.D. Professor of Biological Sciences and Associate Dean of College of Arts and

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Susan Morgan, Ph.D., P .E.

Professor of Civil Engineering and Associate Dean of Graduate School

William Retzlaff, Ph.D.

Professor of Biological Sciences and Associate Dean of College of Arts and Sciences

Serdar Celik, Ph.D.

Professor of Mechanical Engineering Midwest Regional Green Infrastructure Symposium September 23, 2019

SIUE Green Roof Environmental Evaluation Network

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Outline

 Overview of G.R.E.E.N.  Green Wall Maintenance  Thermal Economic

Analyses

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Overview of G.R.E.E.N.

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Timeline

2004 2018

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SIUE Green Infrastructure Sites

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Engineering Building

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Ground-level Field Site

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Student Success Center

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Types of Research

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Research Results

https://www.siue.edu/green/research/index.shtml

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Green Wall Maintenance

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Green Retaining Walls

 Living wall that

stabilizes a slope.

 Designed to:

 Prevent erosion  Increase stormwater

interception, infiltration.

 Reduce Urban

Temperatures

 Beautify vertical space

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Stormwater Collection

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B B A B B B

5 10 15 20 25 30 35 40 45

Control

  • S. hybridium
  • S. kamschatikum

Mixed Sedum

  • S. phedimus
  • S. spurium

Plant Cover (%) Treatment

Mean Plant Coverage by Treatment

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A A A A A A

20 40 60 80 100 120 140 160 180

Control

  • S. hybridium
  • S. kamschatikum

Mixed Sedum

  • S. phedimus
  • S. spurium

Height (cm) Treatment

Mean Block Height by Treatment

Original Block Height

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C B B A

20 40 60 80 100 120 140 160 180

East North South West Block Height (cm) Wall Aspect

Mean Block Height by Aspect

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A A A A A A

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6

Control

  • S. hybridium
  • S. kamschatikum

Mixed Sedum

  • S. phedimus
  • S. spurium

' Displaced Blocks Treatment

Mean Number of Displaced Blocks by Treatment

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Long-Term P Performance ce/Maint intenance

  • There has been some, limited block

settling

  • 38 of 990 blocks have been displaced

(~4%)

  • 5 of 990 blocks have been dislocated

(<1%)

  • Many of the original plants are still

covering the wall system

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Thermal Economic Analyses

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Thermal and Economic Analyses

Coupled green roof model

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Theory

) ( ) (

4 4 ∞

− − + + = T T A G G G A q

s R d ND radiation

εσ α

) (

∞

− = T T hA q

s convection

total r s conduction

R T T A q ) ( − =

Reflected irradiation Diffuse irradiation Normal direct irradiation Unit thermal resistance through all layers

...

3 3 2 2 1 1

+ + + = k L k L k L Rtotal

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Vegetation

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Growing Media

Media Description Arkalyte Clay heated to 1000 0C Lava Volcanic rock Pumice Volcanic Rock

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Temperature Data for All Combinations

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Peak Hours on August 12, 2007

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Heat Flux on August 12, 2007

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Energy Cost of a 50,000 m2 Roof during Peak Hours

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Summary: Thermal

 The color of the growth media and the vegetation affects the

thermal radiation to/from the green roof blocks significantly.

 The porosity of the growth media helps the evaporative

cooling of the roof after rain/irrigation events. This is an active cooling process in addition to the added thermal resistance to the roof by the green roof systems.

 The more condensed the leaves are, the better shading effect

  • ccurs, resulting in better insulation in air-conditioning
  • seasons. Maintenance helps achieve higher plant coverage and

leaf area index, resulting in improved thermal benefits.

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Questions?

https://www.siue.edu/green Susan Morgan, smorgan@siue.edu https://www.researchgate.net/profile/Susan_Morgan5 Bill Retzlaff, wretzla@siue.edu https://www.researchgate.net/profile/Bill_Retzlaff Serdar Celik, scelik@siue.edu https://www.researchgate.net/profile/Serdar_Celik3