What is the impact of apartment unit position and WWR on Useful Daylight Illuminance?

Fatemeh Mostafavi - September 11, 2021

Medium span (30 seconds)

What is the impact of apartment unit position and WWR on Useful Daylight Illuminance?

Project Location:

Simulation Scale:



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

This diagram illustrates the impact of an apartment unit position (floor number) and its window to wall ratio (WWR) on the Useful Daylight Illuminance (UDI) map. To take the climatic context into account, this map would be practical for mid-latitude sites (30-40 degrees north). The obstruction has been modeled as a 5-floor building (same height as the evaluated building) in southern part with 10 meters distance from the southern edge of the building.

What type of graphic is this?

  • Diagram

Design Variables

  • Glazing Fraction/Window to Wall ratio
  • Other

Is this part of the ASHRAE-209 cycle?

What tools were used for the simulation analysis?

  • Other

What tools did you use to create the graphic?

  • PowerPoint

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

this graphic contains the UDI map of an apartment case, considering both window to wall ratio and floor number alongside taking surrounding buildings' obstruction into account. moreover, the process of changing useful daylight illuminance in 15 maps in the diagram simply shows the comparison between two mentioned parameters.

Is there anything else you would like to mention?

The conclusion from this diagram is that the floor number has more considerable impact on UDI than window to wall ratio, when surrounding buildings are also considered in daylight analysis. It helps designers to have a simultaneous understanding of the two mentioned variables when designing spaces to take the advantage of daylight.

Included in the competition:

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

July 15, 2021-September 20, 2021