The Thermal and Rainwater Runoff Performance of an Extensive ...

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9 Conclusions and Recommendations9.1 ConclusionsIn conclusion, it can be seen the effect that the different layers of the green roof have ontemperature. The vegetation and substrate of the sedum blanket absorb and dissipate heatallowing for cooler temperatures beneath the roof. This results in higher temperatures at thesubstrate and vegetation level compared to the ambient air and under roof temperatures.In terms of the runoff performance of the green roof in comparison with a perspex sheet (toreplicate a PV panel), the sedum blanket delays and reduces the rainwater runoff. For arainfall intensity of 1 mm/min, 9 mm of rain is required to start runoff. For a rainfall intensityof 2 mm/min, 10 mm is required to start runoff.9.2 RecommendationsThe experimental scope of this project was limited by its timescale and the ability to obtainand set up the necessary equipment/apparatus within this period (and obtain/analyse results).A study for a longer period of time would be required to obtain any conclusive results – butthe results from this project show an example of the performance of extensive green roofs.Research into the thermal performance of green roofs is well established. However, thecomparison of rainwater runoff between green roofs and PV panels is an area of researchwhich could further be explored. It is established that the cooling effect of green roofs help toimprove PV efficiency, but the evidence from this project suggests that green roofs wouldalso offset the ‘poorer’ runoff performance of PV panels – an additional benefit. Furtherresearch into this on a larger scale, over a longer period of time would provide moreconclusive results.Niall Carroll Page 68The Thermal and Rainwater Runoff Performance of an Extensive Green Roof System
References1. Sailor D.J. ‘A Green Roof Model for Building Energy Simulation Programs.’ PortlandState University. 2008.2. Richardson, V. ‘Grass Roots Uprising: Green Roofs.’ RIBA Journal, 108 (12). 2001.3. Newton. J. ‘Building Greener: Guidance on the use of Green Roofs, Green Walls andComplementary Features on Buildings.’ CIRIA. 2007.4. www.metropolismag.com/story/20060911/green-roof-timeline5. www.igra-world.com6. www.livingroofs.org7. Harrison H W. ‘Roofs and Roofing.’ Building Research Establishment. 2000.8. Grant G. Englebeck L. and Nicholson B. ‘Green Roofs: their existing status andpotential for conserving biodiversity in urban areas.’ English Nature ResearchReports 498. 2003.9. Brownlie, S. ‘Roof Gardens – A Review.’ Urban Wildlife Now, No. 7.Peterborough:Nature Conservancy Council. 1990.10. Johnston, J. ‘Rooftop Wildlife.’ Enact, 3. 1995.11. Johnston, J. & Newton, J. ‘Building Green: A Guide to using Plants on Roofs, Wallsand Pavements.’ London Ecology Unit. 1993.12. Osmundson, T. ‘Roof Gardens: History, Design and Construction.’ New York:Norton & Co. 1999.13. Wells, M. ‘Rarity on the Roof? Finding Partial Solutions to Challenges of BrownfieldSite Redevelopment.’ In Practice, 33. 2001.14. Ferguson, B. ‘Introduction to Storm Water: Concept, Purpose, Design.’ 1998.15. www.thegreenroofcentre.co.uk/green_roofs/benifits_of_green_roofs16. www.livingroofs.org/stormrunoff.htmlNiall Carroll Page 69The Thermal and Rainwater Runoff Performance of an Extensive Green Roof System
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Department of Mechanical Engineerin
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AbstractThis project addresses the
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Table of Contents1 Introduction…
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6.2.1 Rainfall Runoff Relationship
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List of FiguresFigure 1: Traditiona
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Figure 32: Humidity Sensor Located
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1 Introduction1.1 Green Roof Defini
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incorporate green roofs into their
Page 17 and 18: 2.3 ExtensiveFigure 5: Extensive Gr
Page 19 and 20: 2.33 Green/Brown Roofs for Biodiver
Page 21 and 22: 3 Construction of Green RoofsThe co
Page 23 and 24: 3.2 Inverted Warm Green Roof Constr
Page 25 and 26: Although less versatile than intens
Page 27 and 28: There are four main methods of esta
Page 29 and 30: • extension of park system• pro
Page 31 and 32: In summer, green roofs can retain 7
Page 33 and 34: The urban heat island effect descri
Page 35 and 36: 4.6 Building FabricWhen vegetation
Page 37 and 38: 5 UK Policy on Green RoofsThere are
Page 39 and 40: Figure 16: Summer Temperatures of R
Page 41 and 42: However, the previous study mention
Page 43 and 44: Similarly, Simmons et al. [41] foun
Page 45 and 46: Figure 20: Green Roof Test Rig for
Page 47 and 48: The mineral content of the substrat
Page 49 and 50: Figure 25: NI USB-9211 Thermocouple
Page 51 and 52: It was used to acquire the relative
Page 53 and 54: Figure 33: NI USB-6008 Terminal Ass
Page 55 and 56: Figure 35: Labview Signal Express T
Page 57 and 58: 7.2 Green Roof Energy BalanceThe gr
Page 59 and 60: (4)Where,α s = Shortwave Absorptiv
Page 61 and 62: A green roof test rig was set up to
Page 63 and 64: Figure 40: Green Roof Test Rig for
Page 65 and 66: second day of the experiment. The l
Page 67: with the artificial rain event. Whe
Page 71 and 72: 31. Mellor, R.S. Salisbury, F.B. Ra
Page 73 and 74: Appendix 1Niall Carroll Page 73The
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