This article will guide you through conducting an Illuminance study on your BIM model. This study will help you optimize your window placements, room layouts, and material choices for well-lit, energy-efficient spaces. Note that this analysis can only be conducted on a BIM model & not the concept models (created with spaces)
Step 1: Start by opening your BIM model in the BIM Mode.
Step 2: Navigate to the Sustainability tab located at the top right corner. From the drop-down menu, select Illuminance.
Note: Topography is required to conduct this analysis. Follow these steps to import topography:
Click "Import Topography" from the sustainability tab – This will open the import window for adding site topography.
Enter Site Details – Input the site name or enter latitude and longitude coordinates.
(Optional) Add Surrounding Buildings – Include nearby structures for a more detailed context. This will enhance the shadow analysis.
Click "Load Topography" – The system will import the site context into the project.
Once imported, move and position the site as needed in relation to your model.
For detailed guidance, refer to the tutorial on Importing Topography.
Step 3: Once you've placed the topography, start the analysis. Define the start and end date of your analysis from the drop-down menu.
Step 4: Click on Run Analysis to start the process.
Step 5: Upon completion of the analysis, the representation of Illuminance within your model will be available for review. Please refer to the accompanying legend, which delineates the Illuminance levels in lux per hour. The color gradients within the model signify areas that will experience direct sunlight as well as those that will receive minimal sunlight. The Illuminance assessment is updated in real time, reflecting changes in your openings, exterior materials, and window configurations.
Pro-tip:
1. Make changes to the model and run the analysis again to view different illuminance results. For instance, replacing a glass wall with a brick wall will show you the difference in sunlight penetration through the heat map.
2. To further understand the sun effects on your building, activate the Sun Path. This will back your Illuminance with the sun path diagram for the region brought in via topography.
