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Building Performance Modeling

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The goal of this discussion is to demystify building performance modeling. Computer-simulations give you a more complete picture of how various context and design factors can affect the performance of your space. Modeling information can help you analyze the impacts of your design decisions and determine how to most effectively meet project goals.

Energy modeling is also valuable tool used for code compliance and LEED points. Not to mention the fancy graphics that models produce to show your clientele your commitment to performance-based design.

This discussion will present various opportunities that can arise from building performance simulations with analysis at the early design, whole building, and building component levels. We will examine the following types of analysis:
• Climate
• Daylighting
• Massing and orientation
• Whole building energy usage forecast
• Fenestration design
• Façade development
• Zone level energy performance
• Baseline and design case models
• System selection and optimization

For more information on this training, contact Brittany Grech at bgrech@yrgsustainability.com or (347) 843-3085.

Published in: Real Estate
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Building Performance Modeling

  1. 1. Building Performance Modeling<br />
  2. 2. Learning Objectives<br />Describe capabilities of building modeling<br />Recognize model outputs<br />Be familiar with when simulation can be used to assist design decisions<br />Understand how modeling analysis can be implemented into your design process<br />
  3. 3. Agenda<br />Energy modeling<br />Benchmarks and rating systems<br />Performance modeling<br />Design optimization<br />Integrated design process<br />Lessons learned<br />
  4. 4. 3 D modeling<br />
  5. 5. ≤55%<br />≤73%<br />7%<br />Energy Modeling As We Know It<br />
  6. 6. What’s good about this building?<br />
  7. 7. What’s good about this building?<br />
  8. 8.
  9. 9. $$<br />EUI<br />CO2<br />LEED<br />40%<br />CODE<br />
  10. 10. Energy Use Distribution<br />
  11. 11. Window-to-Wall Ratio<br />≤16%<br />≤27%<br />≤38%<br />Glazing Parametric Energy Analysis<br />
  12. 12. Goal Setting<br />
  13. 13. Building’s Performance – Simulation Opportunities<br />
  14. 14. Light Shelves<br />
  15. 15. Building’s Performance – Simulation Opportunities<br />
  16. 16. Fenestration- Parametric Modeling<br />
  17. 17. Solar Path on June 21st<br />
  18. 18. East<br />Solar Location- Low <br />Best practice- Vertical fins<br />West<br />Solar Location- High<br />Best practice- Horizontal Overhangs<br />Sun Path- East and WestFaçades<br />
  19. 19. North<br />Solar Location- Low <br />Best practice- None or Vertical fins<br />South<br />Solar Location- Above<br />Best practice- Horizontal Overhangs<br />Sun Path- North and South Façades<br />
  20. 20. Glazing Performance- Sun Ray Vector<br />
  21. 21. Comfort Optimization- Daylight Analysis<br />
  22. 22. All Vertical Fins<br />20%<br />All Horizontal Shades<br />Combination<br />30%<br />40%<br />Shading System Optimization- Solar Radiation Analysis<br />
  23. 23. 30.1%<br />SavingsOver Baseline<br />31.11%<br />32.4%<br />34.3%<br />Shading System Optimization- Energy Use Analysis<br />
  24. 24. 1:4<br />1:3<br />1:2<br />1:1<br />Further Shading System Optimization – Vertical Fin Performance Metric<br />
  25. 25. Depth-to-Distance Ratios<br />Horizontal Fins<br />Fin<br />Façade (~84°)<br />Max Incline Condition<br />1 to 2.8 ratio<br />Tower Interior<br />Max Summer (75.9°)<br />Max Winter (29.0°)<br />Fin<br />Façade (~90°)<br />Typical Condition<br />1 to 3.6 ratio<br />Tower Interior<br />Max Summer (75.9°)<br />Max Winter (29.0°)<br /> Shading Fins – Range of Performance<br />
  26. 26. Annual Climate Analysis <br />
  27. 27. New York<br />Denver<br />°F<br />Phoenix<br />Hong Kong<br />113+<br />104<br />95<br />86<br />77<br />68<br />59<br />50<br />41<br />32<br />Annual Temperature Profile<br />
  28. 28. 320 F<br />Cooling<br />Heating<br />Insulation<br />Insulation<br />Jan<br />Feb<br />Mar<br />Apr<br />May<br />Jun<br />Jul<br />Aug<br />Sep<br />Oct<br />Nov<br />Dec<br />Energy Demand<br />
  29. 29. Annual Climate Analysis <br />
  30. 30. Building’s Performance – Simulation Opportunities<br />
  31. 31. Energy Use Distribution<br />
  32. 32. ≤36%<br />Active System Optimization<br />
  33. 33. ft/s<br />Site Wind<br />32.0+<br />Strong breeze<br />Fresh breeze<br />29.5<br />26.2<br />22.9<br />Moderate breeze<br />19.7<br />16.4<br />Gentle breeze<br />13.1<br />Light breeze<br />9.8<br />6.6<br />Calm<br />3.3<br />Ventilation Analysis<br />
  34. 34. Reduced<br />Electric<br />Lighting<br />Reduced<br />Cooling<br />Loads<br />Landscape<br />Irrigation<br />HVAC<br />Cooling<br />Tower <br />H2O<br />Daylighting<br />Rainwater<br />Collection<br />Passive<br />Winter<br />Heating<br />Reduced<br />HVAC<br />Size<br />Stormwater<br />Management<br />Non-potable<br />H2O Source<br />Interactive Approach<br />
  35. 35. Comparative Analysis- Early Design<br />
  36. 36. What is a Building?<br />Shelter for occupant comfort<br />What is Performance? <br />“The manner in which or the efficiency with which something reacts or fulfills its intended purpose”<br />What is Simulation?<br />Computer program for representation of the behavior or characteristics<br />What is Building Performance Modeling?<br />
  37. 37. Curtainwall<br />Punched Window<br />Designer’s Dilemma<br />
  38. 38. Glazing- Energy Reduction and Daylight Increase<br />
  39. 39. 100% Glazed<br />50% Daylight<br />Annual Temperature<br />Cooling load<br />0% Glazed<br />0% Daylight<br />Glazing- Range of Performance<br />
  40. 40. Optimum daylight <br />Fenestration- Optimized System<br />
  41. 41. Integrative Team: The Composite Master Builder <br />
  42. 42. Active systems: Energy use<br /><ul><li>HVAC
  43. 43. Lighting
  44. 44. Plug loads</li></ul>Passive systems: Structure<br /><ul><li>Walls
  45. 45. Roofs
  46. 46. Windows
  47. 47. Shading System</li></ul>INFLUENCE<br />Passive and Active Systems<br />
  48. 48. Optimization Pathway<br />HVAC<br />AND<br />CONTROLS<br />RENEWABLE<br />ENERGY<br />SYSTEM SELECTION<br />ENERGY COST BUDGET<br />DEMAND<br /> REDUCTION<br />PARAMETRIC ENERGY USAGE<br />ENVELOPE<br /> AND<br />DAYLIGHT<br />RADIATION AND DAYLIGHT<br />ORIENTATION<br />AND<br />PLACEMENT<br />CLIMATE AND CONTEXT<br />1<br />2<br />3<br />4<br />5<br />Model Outputs<br />Modeling Analyses for Integrated Design<br />
  49. 49. Summer Winds–<br />Permeable Envelope<br /><ul><li>Operable panes
  50. 50. Intake, Exhaust vents</li></ul>Winter Winds– <br />Thermal Envelope<br /><ul><li>Low U-value
  51. 51. Low infiltration</li></ul>Site Analysis <br />
  52. 52. Building Climate Interaction<br />
  53. 53. Energy Modeling - Inputs<br />Location<br />Setpoints<br />Orientation<br />Loads and Occupancy<br />People- 250sqft/person<br />Lighting- 1.1 w/sf<br />Computers- 2w/sf<br />Occupancy Hours<br />Construction<br />Wall to Window area<br />Glazing: Glass: SHGC= 0.30; VLT= 0.45<br />Opaque area: U value= 0.35<br />Mechanical system<br /><ul><li>Heating- continuously on- electricity
  54. 54. Cooling- continuously on- electricity
  55. 55. Dual duct variable air volume
  56. 56. Water cooled chillers
  57. 57. Heat recovery or economizers
  58. 58. Fan and pump inputs
  59. 59. Renewable energy</li></ul>Domestic Hot Water<br /><ul><li>1000 gallon storage
  60. 60. Size</li></ul>Specialty equipment<br />Whole Building Energy Model Inputs<br />
  61. 61. Whole Building Energy Modeling Results<br />
  62. 62. Benchmarking Tools and Rating Systems<br />
  63. 63. Design Models SD phase analysis DD/CD phase analysis<br />IES VE<br />SketchUp<br />eQuest<br />Rhino 3D<br />Ecotect<br />Revit<br />Daysim/Radiance<br />AutoCAD<br />Tool workflow<br />
  64. 64. Design Integrated Analysis<br />
  65. 65. YRG sustainabilityconsulting – education – analysis<br />www.yrgsustainability.com<br />ArpanBakshi, Sustainability Manager<br />abakshi@yrgsustainability.com<br />Shillpa Singh, Senior Sustainability Manager<br />ssingh@yrgsustainability.com<br />

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