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CAD tip CAD tip # 10192:

Question CAD 
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Q - question

Wrong results when adding or subtracting °C temperatures in Revit.

A - answer Internal calculations performed by Revit on expressions with parameters of the type "temperature" are always done in Kelvins, even when the project units are set to °C. In projects and RFA families, this may lead to improper repeated use the offset "zero temperature" - 273.15K - in expressions involving the temperature parameters.

Procedures and workarounds for proper correction of degrees Celsius temperatures are summarized in the blog post Counting with temperatures in Revit (°C vs. Kelvins) (in Czech) on our BIM blog ("on the wall").

Similarly, "temperature" expressions are evaluated in Autodesk Inventor.

100% *  CAD 
3.2.2015    4632×  
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applies to: Revit · Inventor ·

See also:
Tip 12777:Arithmetic and trigonometric functions available in Revit expressions.
Tip 12624:How to enter dimensions in Revit using other units?
Tip 11494:Entering decimal values using fractions in CAD applications.
Tip 8887:Strange Revit message "Square feet per foot".
Tip 8253:Nudging AutoCAD and Revit objects with cursor keys.

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