How To Calculate Daylighting Using FenestraPro

March 22, 2020

 
 

How to Calculate Daylighting

FenestraPro for Revit displays Design Daylight Factor for Facades and Surfaces per Unit Floor Area within the Perimeter Zone. This method denotes the illumination that is provided indoors relative to the simultaneous illumination outdoors under overcast skies. The units produced are shown as a percentage. Most guidelines recommend between 2 – 5% as a good range. Results below 2% would be considered underlit and results above 5% may create glare.

The Setting for Location in the Building Manager will define the Maintenance Factor for glazing. This refers to how clear the glass is expected to be maintained and will vary whether the setting used is Urban, Suburban or Rural. This setting will determine the Maintenance Factor which will be either 0.92 for Urban or 0.96 for Suburban and Rural. This value will factor into the Daylight Calculation. In mass models, this value is displayed when all facades are selected.

Clicking on a specific Surface will display results for that Surface alone. Clicking on multiple Surfaces will display an average for those selections. The results are graded by colour to provide a visual indication of low daylight (gray) to good daylight (yellow).

The Daylighting Chart above displays the average daylight of surfaces selected.

When a specific Façade is selected in Façade Manager more detail is displayed from this parent Façade, such as its child surfaces. To view the Results for a specific Surface, clicking into the bar chart will display results for that Surface only.

To go back to viewing all results, click on the arrow button at the top of the window (this will display when a specific Surfaces are selected). This will also uncheck any previous selections in the Façade Navigator.

If several Surfaces have been selected and the Charts display these results, clicking on any Surface bar in the Chart will select just that Surface and display monthly values. Using the roll up arrow on the top right of the Charts panel will return to viewing all the Facades.

Changing the Glazing Specification for windows or Curtain Walls may affect the Visual Light Transmittance value. This can be viewed in Type Properties of Revit or in FenestraPro Linc. This will affect the Daylighting results since a lower value for VLT will restrict light transmission more than a higher value.

Adding shading devices or fritting to glazing will also affect the Daylighting Results. Fritting in FenestraPro has settings for both coverage and Transparency. A higher coverage will reduce daylight. A lower value for Transparency of the fritting (meaning that it is more opaque) will reduce daylight more than a higher value.

Note: for Shading devices to affect the results, turn on Shading Calculations in the Building Manager.

 

About FenestraPro For Revit

FenestraPro For Revit, a user-friendly platform that combines considerations for daylighting, thermal performance and analysis of solar heat gain, enables designers to keep this aesthetic control.

FURTHER READING

Determining Thermal Performance: The FenestraPro Glazing Analysis App

Determining Thermal Performance: The FenestraPro Glazing Analysis App

Determining Thermal Performance: The FenestraPro Glazing Analysis AppINTRODUCTION Ever try to calculate the detailed thermal performance of a facade from inside Revit? It’s not easy, right? We’re very excited to launch the FenestraPro Glazing Analysis application as...

How to Identify Energy Modelling Issues Using the Diagnostic Tool

How to Identify Energy Modelling Issues Using the Diagnostic Tool

How To Identify Energy Modelling Issues Using the Diagnostic Tool INTRODUCTION The Diagnostic Tool within FenestraPro For Revit provides diagnostic information on the model before analysis even begins, highlighting issues which may interfere with successful analysis. ...

OFFICES
Ireland
+353 (0)1 661 9609
39 Leeson Street Lower, Dublin D02 PY89

UK
+44 (0)800 046 1521
86-90 Paul Street, London EC2A 4NE

USA
+1 212 726 2114
244 Fifth Avenue, Suite 2941, New York, NY 10001

WRITE TO OUR TEAM

For assistance with our software solutions:
support@fenestrapro.com

For sales and business development:
sales@fenestrapro.com

For all other matters:
info@fenestrapro.com