Methodology for the Evaluation of Natural Ventilation in ... - Cham

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One Window Open: Upper versus Lower Window LocationTable 59. Scaled Temperature Distribution Comparison of Lower and Upper Windows for One Window,Three Stack Model Case1 Window 3 Stacks TemperatureLocationLower Windows(°C)Upper Windows(°C)Scaled Temperature Texhaust 16.87 16.12Tatrium 16.42 15.83Tatrium-lower 15.87 15.43Tatrium-upper 16.50 15.90Theated-zone 19.94 19.75Tcolumn 16.34 16.24Tcolumn-lower 13.00 13.45Tcolumn-upper 18.78 18.94Model Taverage 16.72 16.46outlet velocity 0.57 0.6Table 60. Scaled Temperature Distribution Comparison of Lower and Upper Windows for One Window,Two Stack Model Case1 Window 2 Stacks TemperatureLocationLowerWindows (°C)Upper Windows(°C)Scaled Temperature Texhaust 20.27 17.44Tatrium 19.38 17.20Tatrium-lower 18.30 16.73Tatrium-upper 19.56 17.27Theated-zone 22.60 20.93Tcolumn 19.68 17.69Tcolumn-lower 15.06 14.75Tcolumn-upper 23.45 20.42Model Taverage 19.79 17.80outlet velocity 0.7 0.7198
Single Heated Zone Model vs Building: Lower Windows OpenTable 61. Comparison of Dimensionless Temperature Distribution for Model and Hypothetical Building:Seven Window Cases-Lower WindowExperimental ModelTemperaturesPredicted Building Temperatures(Tambient=20 C)Ground FloorColumn7 windows3 stacks7 Windows2 Stacks7 windows3 stacks7 Windows2 Stacks26 cm / 3 m 26.38 29.31 22.90 23.2219 cm / 2.3 m 25.16 28.38 22.77 23.1212 cm / 1.4 m 21.90 24.68 22.41 22.715 cm / 0.6 m 18.35 20.33 22.02 22.24Ground FloorHeated Zone7 windows3 stacks7 Windows2 Stacks7 windows3 stacks27 cm / 3.2 m 27.85 31.15 23.06 23.4321 cm / 2.5 m 25.33 29.10 22.79 23.2015 cm / 1.8 m 26.01 27.79 22.86 23.069.5 cm / 1.1 m 26.29 24.44 22.89 22.693 cm / 0.4 m 38.94 41.63 24.28 24.587 Windows2 StacksAtrium7 windows3 stacks7 Windows2 Stacks7 windows3 stacks100 cm / 12 m 22.80 26.08 22.51 22.8775 cm / 9 m 23.03 26.65 22.53 22.9350 cm / 6 m 22.59 26.36 22.49 22.9025 cm / 3 m 21.48 24.46 22.36 22.697 Windows2 StacksTable 62. Comparison of Dimensionless Temperature Distribution for Model and Hypothetical Building:Five Window Cases-Lower WindowExperimental ModelTemperaturesPredicted Building Temperatures(Tambient=20 C)Ground FloorColumn5 Windows3 Stacks5 Windows2 Stacks5 Windows3 Stacks5 Windows2 Stacks26 cm / 3 m 28.23 31.08 23.11 23.4219 cm / 2.3 m 27.51 30.20 23.03 23.3212 cm / 1.4 m 24.99 27.53 22.75 23.035 cm / 0.6 m 20.91 23.38 22.30 22.57Ground FloorHeated Zone5 Windows3 Stacks5 Windows2 Stacks5 Windows3 Stacks27 cm / 3.2 m 29.79 32.18 23.28 23.5421 cm / 2.5 m 28.55 30.53 23.14 23.3615 cm / 1.8 m 27.46 29.60 23.02 23.269.5 cm / 1.1 m 25.47 27.64 22.80 23.043 cm / 0.4 m 41.28 43.19 24.54 24.755 Windows2 StacksAtrium5 Windows3 Stacks5 Windows2 Stacks5 Windows3 Stacks100 cm / 12 m 25.00 27.47 22.75 23.0275 cm / 9 m 25.06 27.71 22.76 23.0550 cm / 6 m 25.39 27.76 22.79 23.055 Windows2 Stacks199
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Thesis Committee:Leon R. Glicksman,
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Table of ContentsTable of Contents
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7.1.3 Full Model Case .............
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Figure 41. Wind Direction Data for
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List of TablesTable 1. Energy End U
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Table 64. Comparison of Dimensionle
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Chapter 1.0IntroductionEnergy consu
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insulated building envelopes with t
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energy usage and efficient design.
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Figure 3. European Patent Office Bu
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selecting boundary conditions) to e
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2.2.1 Buoyancy-Driven VentilationVe
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Figure 7. Neutral Pressure Level fo
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Combined wind-buoyancy flow is more
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design. The depth of natural ventil
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of cooling required by 30 percent o
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considered when determining how the
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environmental conditions are examin
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As natural ventilation is prevalent
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Chapter 3.0Evaluation of Prototype
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Figure 12. Interior Atrium ViewFigu
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Table 8. Prototype Building Window
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Figure 15. HOBO® H8 Series Tempera
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Finally, airflow visualization was
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only is the airflow almost never at
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Table 10. Window Bag Device Measure
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Mon 7-21Tue 7-22Wed 7-23Thu 7-24Fri
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12:00 AM1:00 AM2:00 AM3:00 AM4:00 A
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27-Jul27-Jul28-Jul28-Jul29-Jul30-Ju
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A range of air exchange rates was f
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the windows on the second floor, or
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Total Electric (kWh/m2)Total Gas (k
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movement, Houghton Hall has much le
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Chapter 4.0Modeling and Visualizati
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for future design of similar type b
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lower and upper openings and natura
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the acceptable diffusion rate, or
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applications involving full-scale b
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digital camera with both manually o
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Chapter 5.0Dimensional Analysis and
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u oHgHT2uocu Hpo1Re Ar1Re Pr(5.7)(5
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X HM X HP(5.16)5.3.2 Kinematic Sim
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Radiation was found to have an impa
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height is used for the full-scale b
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6.3 Model Descriptions6.3.1 Physica
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Figure 30. Floor Plan of the Protot
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Figure 31. North Facade of Model wi
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Monitoring data collected from the
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By default, there was no accounting
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40-location card inserted into the
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6.5 ExperimentsTo evaluate the mode
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modified to determine the impact of
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Figure 39. Two Heated Zone ModelWit
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minute interval, the model was assu
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Figure 42. Cross-Section of Wind-Ge
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Table 25. Wind-Assisted Ventilation
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Figure 44. Heaters and Zones for a)
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Height from Floor (m)Height from Fl
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Where V is the outlet velocity, A o
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Table 32. Conduction Heat Loss for
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a) Air Modelb) Water ModelFigure 50
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Height from Floor (m)The temperatur
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Height from Floor (m)In the atrium
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First NorthUpper Window 0.17 m/s -0
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Height from Floor (m)the column at
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Height from Floor (m)Height from Fl
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Height from Floor (m)3.53.02.52.01.
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was less than 12 percent. These val
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Table 39. Variation of Outlet Wind
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temperature of the air was the same
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3.532.521.55m/s4m/s3m/s2m/s1m/s1.5m
Page 148 and 149: 3.532.521.55m/s4m/s3m/s2m/s1m/s1.5m
Page 150 and 151: The average and exhaust internal bu
Page 152 and 153: Table 43. Calculated Wind and Buoya
Page 154 and 155: In the last two lines, for both the
Page 156 and 157: Figure 80. CFD Simulation of the Te
Page 158 and 159: uoyancy case the air from the groun
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Page 162 and 163: windows of naturally ventilated bui
Page 164 and 165: difficult to select the boundary co
Page 166 and 167: simulations are able to do would al
Page 168 and 169: Bordass, W.T., A.K.R. Bromley and A
Page 170 and 171: Linddament, M. 1996. Why CO2? Air I
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Page 174 and 175: MODEL: K20-8SERIAL: 10047RECORDER_I
Page 176 and 177: 2 Boiler-3 50.00 C1 N1 1.0 ON ON OF
Page 178 and 179: |PW|DESCRIP |KW |KWH|KVA|KVH|------
Page 180 and 181: 2:5 ;day_ofYr17:P30 ;EOT = 0.000075
Page 182 and 183: 2:3136:P30 ;DUM2 = -0.040891:-4.089
Page 184 and 185: ;7:21 ;input location;8:0 ;mulptipl
Page 186 and 187: ;79:P22 ;EXC w/DELAY (only for dela
Page 188 and 189: 1:45 ;port5 (homeSense)2:31 ;exit l
Page 190 and 191: 13:P95 ;ENDIF14:P95 ;ENDIF15:P3 ;pu
Page 192 and 193: 2:20 ;RH30:P70 ;sample1:12:20 ;RH31
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Page 196 and 197: Five Windows Open: Upper versus Low
Page 200 and 201: 25 cm / 3 m 24.33 26.62 22.68 22.93
Page 202 and 203: 25 cm / 3 m 24.07 25.26 22.65 22.78
Page 204 and 205: Two Stacks Open Temperature Stratif
Page 206 and 207: Stacks Closed Temperature Stratific
Page 208 and 209: 2.3 24.31 24.65 24.781.4 23.35 23.6
Page 210 and 211: 0.6 20.56 20.67 20.94 21.22 21.41 2
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