OEC Case Studies

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Use of Scenarios as Framework for Learning

  • Not every case study will teach every lesson. Repeat lesson at least twice over all case studies, i.e. sun control in office and classroom.
  • Demonstrate quality issues. Start with acceptable solution, allow user to modify. Show consequences on quality, energy savings, user acceptance, daylight autonomy, glare potential, thermal, envelope, whole-bldg, cost.
  • Indicate client goals and intent for initial solution
  • Show options for placement of luminaires – pros and cons related to quality and interaction with daylight and control zones.
  • Show zoning options or allow user to select zones. Analyze impact
  • Allow user to change project orientation, climate, location
  • Allow user to change characteristics – ceiling heights, finishes, VLT, fenestration.
  • Obstructions
  • Sun control – interior and exterior.
  • Shading options and assumptions. Importance of usage on savings and satisfaction. Automated and manual. Angled, diffuse, semi-obscuring, BTDF.
  • Design of shading controls (Priority 2): Rapid changes in partially cloudy conditions
  • Location of sensors. Concept of worst case worker, or critical point
  • Location of occupant controls.
  • “Control Design Intent Narrative” for each case study. Only for initial well designed condition, or for multiple options?

Office (sidelit or toplit)

  • Sidelit Space: One zone dimming closed loop
  • Sidelit Space: Multiple zones.
  • Toplit: Closed loop dimming [general lighting]
  • Bi-lit space, adjacent, opposite, all three [overcast sky condition: daylight section through space, same for clear sky]- Meek/VDW pattern books
  • Sun control / shading. External and internal. Automatic or manual
  • Furniture / Interior design strategies. Open plan, impact of partition heights and ceiling heights, location of open plan near windows and private office inboard.

Gymnasium (toplit space)

  • Open loop dimming [diming and switching]
  • Different levels of competition.
  • Irregular time schedule

Retail/Big Box (toplit space)

  • Open loop dimming [diming and switching]
  • Regular time schedule
  • Switching, occupancy sensors, after-hours stocking, cleaning

Classroom (sidelit, toplit, bi-lit)

  • Integration of daylighting with other control strategies: contrast ratios, be able to lower shades.
  • Talk about photocell controlled dimming being disabled for AV presentations.
  • Sun control, external versus internal
  • CHPS pattern book for electric lighting

Conference room (sidelit or bi-lit)

  • Integration of daylighting with other control strategies such as AV: contrast ratios, be able to lower shades : talk about photocell controlled dimming being disabled,
  • Pre-set multi scene controls.
  • Motorized shading


  • When to redesign rather than retrofit
  • Existing building limitations: fenestration, orientation, obstructions.
  • Existing building benefits: high ceilings, initially designed for daylighting, shallow plates
  • Compensatory lighting. Reduce contrast by dimming near punched windows (show with DA and DGP metric), increasing electric lighting where necessary to improve daylight harvesting, worst case sensor locations, avoidance of user rejection.
  • Wattstopper case study booklet;
  • Case study: US EPA Washington DC
  • Mention wireless controls

How to create / present / calculate lessons and case studies

  • Precalculated renderings
  • See Lighting Advisor examples
  • See Meek/VDW pattern book
  • 360 degree panning from photos
  • Library of equipment performance, like photosensor cones of view, occupancy sensor coverage, blinds/shades positions and transmission characteristics.
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