What is the impact of Orientation on Daylight Autonomy at the center of a room?

Nishchay Goyal - September 16, 2021

Long span (2 minutes)

What is the impact of Orientation on Daylight Autonomy at the center of a room?

Project Location:

Simulation Scale:



What is this graphic showing? Describe the different parts of the graphic and how it communicates the data.

The graphic is showing the extent of deficiency in the threshold value of Daylight Autonomy (DA) for 90% of the annual daylight hours for different orientations in the center of the room. The bar graph shows the remaining gap from DA (300) threshold value for every orientation. The heat map further investigates the gap in light levels during the most light deprived parts of the year to gauge the extent of design changes that need to be made to improve the condition at the middle of a deep room. An improvement of 60 lux is needed to achieve DA of 90%

What type of graphic is this?

  • Diagram

Design Variables

  • Other
  • Passive strategies

Is this part of the ASHRAE-209 cycle?

What tools were used for the simulation analysis?

  • Excel
  • Ladybug Tools

What tools did you use to create the graphic?

  • Adobe Illustrator
  • Excel
  • Grasshopper/Rhino

What was successful and/or unique about the graphic in how it communicates information?

sDA metric reports the percentage of space meets illumination requirements. However, if performance is found to be below the requirements it does not tell how light deprived (how far below 300lux), the points in space are. The bar graph is telling us if change in orientation can help in reducing the gap from the DA threshold (300 lux).

Is there anything else you would like to mention?

The carpet plot below shows the time-of-year when light is below 300lux. The second carpet plot (DA, 240 lux) is indicating if the gaps during light deprived periods (winter, monsoon) can be met through small interventions (most cells turn green) or bigger design interventions are needed.

Included in the competition:

Daylighting and Glare with Side Lighting
Daylighting and Glare with Side Lighting

July 15, 2021-September 20, 2021