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Wednesday, August 29, 2012

Calculating the U-value of walls in Revit

What is the U-Value?  It is:
Also known as the U-factor or coefficient of heat transmission, a measure of the rate of non-solar heat loss or gain through a material or assembly. U-values gauge how well a material allows heat to pass through.
http://www.daviddarling.info/encyclopedia/U/AE_U-value.html

autodesk.de recently carried a detailed post on formulas related to the U-value.


Read more at:
Google Translate
of
http://www.autodesk.de/adsk/servlet/pc/item?siteID=403786&id=20378691

Summary

To get the U value of a wall structure, add the sum of the heat transfer coefficients for the wall types specified thermal resistance R T by this value to be used as a divisor.

With walls so:


U = 1 / (Rt (from Revit) 0.17 (K · m) / W)

formel_03

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