openBIM for Daylighting Design & Analyses in respect for Building Energy Performance

Use Case Definition

openBIM is a method to Building Information Modeling (BIM) that uses open standards such as Industry Foundation Classes (IFC), Building Collaboration Format (BCF), and also services buildingSMART Data Dictionary (bSDD). It has gained popularity in the architecture and construction industries for its ability to facilitate collaboration between various disciplines. openBIM Workflow is also particularly effective in Daylight Design and Analyses, where it can facilitate and help designers, reduce energy use through the implementation of daylight strategies through simulations and communication regarding design decisions.
For example, architects and consultants can perform daylight simulations at the early stages of the design process to determine the ideal placement and size of windows, skylights, and shading devices or glare protection as well as measures to avoid overheating. These simulations can be used to evaluate the impact of design decisions on energy use and occupant comfort, ensuring informed decision-making.
      openBIM enables architects and sustainability consultants to collaborate effectively by sharing data and working together in software neutral way, reducing errors and streamlining workflows. Sustainability consultants can access the BIM model, in this case IFC-Models to perform daylight simulations and energy analyses, while architects can incorporate changes based on the results of these analyses, communicated via Issue Management and BCF. This approach ensures that the building design is optimized for energy performance and occupant comfort from the outset.
      In summary, openBIM, when combined with daylight design and analyses, can lead to efficient collaboration between architects and daylight experts, lighting designers and sustainability consultants, resulting in significant reductions in building energy use. The use of open standards of buildingSMART such as IFC, BCF, and bSDD facilitates effective collaboration, ensuring that the building design is optimized for both energy performance and occupant comfort. 


This Use Case is a Part of a bSI IDM "BIM & BEM" aka Technical Report "BIM and Building Energy Modeling / Performance" and covers only Daylighting.

Lighting Design will remain out of scope.

Daylight varies greatly:
- with geographical region;
- with seasons; 
- with the weather condition; and
- with the time of the day

Daylighting Simulations within this Use Case are only based on conditions for CIE overcast Sky for 21st of September at 12:00 p.m.

No theoretical part will be provided.


This Method was used in various past projects like

  • Meffert AG Social Facilities Building in Bad Kreuznach, Germany;
  • New Single Family Home in Gau-Bickelheim, Germany;
  • Existing Single Family Home in Höhr-Grenzhausen, Germany;
  • Pilgrim+ Containerized Low-Energy Building Project in Ankara, Türkiye;
  • Energy Efficiency and Climate Change Awareness Center in Ankara, Türkiye
  • further (available upon request)

Related Standards: 

ISO 10916:2014 - Calculation of the impact of daylight utilization on the net and final energy demand for lighting


BCF - BIM Collaboration Format

IFC - Industry Foundation Classes

MVD - Model View Defintion

BEM - Building Energy Modeling

IDM - Information Delivery Manual

IDS - Information Delivery Specification

Project Group



The documents reflect the current best practice and do not claim to be complete. They should not to be understood in the sense of a generally valid recommendation or guideline from a legal point of view. The documents are intended to support appointing and appointed parties in the application of the BIM method. The documents must be adapted to the specific project requirements in each case. The examples listed do not claim to be complete. Its information is based on findings from practical experience and is accordingly to be understood as best practice and not universally applicable. Since we are in a phase in which definitions are only emerging, the publisher cannot guarantee the correctness of individual contents.

  • Document Type : Use Case
  • GUID : D8302294-3F57-4A29-B98F-C901D21E078B
  • Identifier : -
  • Life Cycle Stage : ISO 22263
  • Revision : V1.1.1
  • Project Status : Approved
  • Maturity level : Example
  • Use Case: Approved
  • Processes: Approved
  • ER: Approved
  • Published on: Aug 29, 2023
  • Last change: Sep 19, 2023
  • Publisher: buildingSMART International
  • Author: Bekboliev, Mirbek | Ouellette, Jeffrey | Bekboliev, Mirbek

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