Week 2 gb course

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Week 2 of Green Building Course

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Week 2 gb course

  1. 1. Passive Design/OTTV Week 1
  2. 2. Discussion: Green Building Survey
  3. 3. Q1: Would you like to work in a green building?
  4. 4. Q2: Would you like to live in a green building?
  5. 5. Q3: Is Green Building more expensive to construct than standard building designs?
  6. 6. Q4: Should every new building designed in Vietnam be a Green Building?
  7. 7. Q5: Can a building with Air Conditioning be called a Green Building?
  8. 8. Q6: Should all Green building include onsite renewable energy production (eg Solar or Wind power)?
  9. 9. Q7: The most important party (group of people) in achieving “Green Building” is…
  10. 10. Government incentives to build Green 4 14% The government to “lead by example” and build Green Buildings 7 25% Stricter laws on building design 5 18% Advertising campaigns about Green Building 1 4% Teach Architects and other professionals about Green Building 2 7% Support industries providing eco- products or highly efficient equipment 5 18% Other 4 14% Q8: The best way to promote Green Buildings in Vietnam is…
  11. 11. Energy Efficiency 7 25% Water Efficiency/recycling/ harvesting 1 4% Sustainability of Materials 3 11% Renewable Energy 4 14% Management 8 29% Other 5 18% Q9: What is the most important consideration when designing Green Buildings in Vietnam?
  12. 12. Passive Design Definition Design where climatic and site conditions are considered to keep the building naturally cool in summer and warm in winter, with adequate ventilation and a comfortable level of natural light while requiring no input of energy for thermal control. Hybrid systems use a variety of cooling options (including air- conditioning) in the most effective way. They take maximum advantage of passive cooling when available and make efficient use of mechanical cooling systems during extreme periods.
  13. 13. Tools for Passive Design Software Data and Information
  14. 14. Autodesk Ecotect Analysis http://usa.autodesk.com/ecotect-analysis/
  15. 15. Ecotect Analysis: Whole-building energy analysis—Calculate total energy use and carbon emissions of your building model Thermal performance—Calculate heating and cooling loads for models. Water usage and cost evaluation—Estimate water use inside and outside the building. Solar radiation—Visualize incident solar radiation on windows and surfaces Daylighting—Calculate daylight factors and illuminance levels Shadows and reflections—Display the sun’s position and path
  16. 16. IES http://www.iesve.com
  17. 17. ARUP Passive Design Assistant Tool http://www.arup.com/Publications/Passive_Design_Assistant. aspx
  18. 18. Climate Data: Temperature, (degree days) http://www.degreedays.net/ QCVN 02 : 2009/BXD
  19. 19. Climate Data: Humidity QCVN 02 : 2009/BXD
  20. 20. Climate Data: Rainfall QCVN 02 : 2009/BXD
  21. 21. Sun path diagram http://solardat.uoregon.edu/SunChartProgram.html http://www.suncalc.net
  22. 22. Wind rose (Ecotect)
  23. 23. Wind rose http://www.windfinder.com/
  24. 24. Solar Irradiation/Insolation
  25. 25. Solar Irradiation/Insolation http://www.gaisma.com/en/dir/vn-country.html
  26. 26. Factors affecting Microclimate: Elevation, Topography, Water Bodies, Vegetation, Heat Island affect
  27. 27. Passive Design Exercise
  28. 28. Passive Design Exercise Location: Hoa Thach, Ha Noi (near Hoa Binh) Project: 4 villas and ladscaping, Each villa: 180m2 Consider: - Microclimate - Orientation of buildings - Orientation of living spaces/bedrooms - Floorplate? How many levels? - Ventilation - Glazing (type and dimensions) - Shading (type and dimensions) - Landscaping - Innovative features?
  29. 29. Fundamentals of Passive Design
  30. 30. Fundamentals of Passive Design
  31. 31. Orientation -Site Selection -Climatic conditions -Prevailing winds
  32. 32. Passive Heating (Hanoi?)
  33. 33. Ventilation -Cross Ventilation -Stack Ventilation
  34. 34. North Facing House (Hiroshi Sanbuichi, Yamaguchi, Japan)
  35. 35. Shading -Overhangs (eaves) -Shading device (louvers, -planting
  36. 36. Shading
  37. 37. Louvers and shading devices
  38. 38. Glazing -Window to Wall ratio
  39. 39. Glazing -Low-E (Emissivity) -tinted -reflective coating -Double (triple) glazing Concepts -SHGC (Solar heat gain coefficient) -Emissivity -VT (Visible Transmittance)
  40. 40. Glazing and Insulation> Saigon Case study
  41. 41. Materials (Hot tropical and Hot dry summer) *Southern Hemisphere
  42. 42. Materials (Courtyard and Nightime cooling) *Southern Hemisphere
  43. 43. Insulation: R Value/U-Value http://www.u-value.net/berechnung/u-wert-rechner/
  44. 44. Insulation: R Value/U-Value http://www.u-value.net/berechnung/u-wert-rechner/
  45. 45. Where to install insulation? - Under the roofing material>reduce radiant heat gain. - In the ceiling> reduce heat gain and loss - In walls> reduce conducted, convected and radiant heat transfer -Underside of suspended floors> In hot or humid climates where AC is used
  46. 46. Thermal Mass
  47. 47. Seasonal Thermal Mass -Europe: Switzerland, Berlin (Germany), Ireland Ice storage -Rokko Shidare observatory
  48. 48. Seasonal Thermal Mass & Ice Storage
  49. 49. Thermal Mass and “Earth coupling”
  50. 50. Underground thermal control (tubes/chambers)
  51. 51. Evaporative Cooling - Sweat -Botijo(Spain)
  52. 52. Evaporative Cooling -Pot in Pot (Zeer) – Northern Africa -Coolgardie safe (1890’s) - Australia
  53. 53. Evaporative Cooling> Applications in architecture -Effectiveness depends on difference between wet-bulb and dry bulb temperature
  54. 54. OTTV Overall Thermal Transfer Value
  55. 55. OTTV Overall Thermal Transfer Value - QCXDVN 09/2005 (EEBC) - New version (2014?) - Used in Singapore, Phillipines, Malaysia, Jamaica, Hong Kong, Thailand
  56. 56. Term 1: Heat conduction due to absorption of solar radiation by opaque surface Term 2: Heat conduction through opaque elements due to temperature difference
  57. 57. Term 3: Transmission of solar radiation through transparent elements Term 4: Heat conduction through transparent elements
  58. 58. OTTV in LOTUS and calculation of reduction
  59. 59. Example “compliant” wall in Hanoi -35% WWR
  60. 60. Example “compliant” roof in Hanoi -Why terms 1 & 2? -5% glazing
  61. 61. Compliant Wall rotations
  62. 62. OTTV case study
  63. 63. Standard Office Premium Office
  64. 64. Standard Office – BASE CASE
  65. 65. Standard Office – WALLS applying measures 1 at a time
  66. 66. Standard Office – WALLS measures applied cumulatively
  67. 67. Standard Office – ROOF applying measures 1 at a time
  68. 68. Standard Office – ROOF measures applied cumulatively
  69. 69. Premium Office – BASE CASE -Clear double glazing assumed
  70. 70. Premium Office – BASE CASE -Clear double glazing assumed
  71. 71. Premium Office – WALLS applying measures 1 at a time
  72. 72. Premium Office – WALLS measures applied cumulatively
  73. 73. Premium Office – ROOF applying measures 1 at a time
  74. 74. Premium Office – ROOF measures applied cumulatively

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