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

More documents

Recommendations

Info

8 Results and AnalysisThe methodology for both thermal and rainwater runoff performance was applied and resultswere obtained and analysed. As mentioned previously, the thermal performance results wereobtained using Labview Signal Express. The rainwater runoff results were obtainedmanually.8.1 Thermal Performance8.11 Test 1The first test was run for 3 days from the 2 nd till the 5 th of September – beginning at 1840hours and finishing at 2140 hours. Figure 41 shows the temperature distribution from variouspoints on the green roof.Figure 41: Test 1 Green Roof Test Rig TemperaturesThe white line indicates the under roof temperature; red for the substrate temperature; greenfor the leaf temperature and blue for the ambient air temperature. As can be seen from figure40, the peak temperature at the vegetation level is 34 o C and this occurs mid-afternoon on theNiall Carroll Page 64The Thermal and Rainwater Runoff Performance of an Extensive Green Roof System
second day of the experiment. The lowest temperature generally occurs above the green roof– dropping to a low of around 5 – 10 o C on the second and third days.As would be expected, the highest temperatures generally occur at vegetation level; where thethermocouple is exposed to the sun but is sheltered from the wind. The substrate temperaturewould be expected to be lower, but a number of factors may explain this such as: the lowmoisture content (15 – 20 %) during the experiment; the shallow depth of substrate and ahigh content of crushed brick and clay shale and also the partially developed coverage of thesubstrate by the vegetation. Over time, as the vegetation layer further establishes, theimproved coverage would help to lower the substrates exposure to the sun, hence lowering itstemperature.8.12 Test 2The second test was run from the 8 th – 11 th of September – starting at 1840 hours andfinishing at 0600 hours. The results can be seen in figure 42.Figure 42: Test 2 Green Roof Test Rig TemperaturesThe second test reflects the results of test 1 – showing that the peak daytime vegetation andsubstrate temperatures (25 – 26 o C) are generally higher than the ambient air and under roofNiall Carroll Page 65The Thermal and Rainwater Runoff Performance of an Extensive Green Roof System
Page 1 and 2:
Department of Mechanical Engineerin
Page 3 and 4:
AbstractThis project addresses the
Page 5 and 6:
Table of Contents1 Introduction…
Page 7 and 8:
6.2.1 Rainfall Runoff Relationship
Page 9 and 10:
List of FiguresFigure 1: Traditiona
Page 11 and 12:
Figure 32: Humidity Sensor Located
Page 13 and 14: 1 Introduction1.1 Green Roof Defini
Page 15 and 16: 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: Figure 40: Green Roof Test Rig for
Page 67 and 68: with the artificial rain event. Whe
Page 69 and 70: References1. Sailor D.J. ‘A Green
Page 71 and 72: 31. Mellor, R.S. Salisbury, F.B. Ra
Page 73 and 74: Appendix 1Niall Carroll Page 73The
show all

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

Create successful ePaper yourself

Delete template?

Save as template?