[Bldg-sim] converting CDD from Celsius to Fahrenheit

Larry Degelman ldegelman at suddenlink.net
Sat Oct 27 08:26:43 PDT 2012

Assuming you’re referring to degree day bases that are exactly equal (e.g. “50F and 10C”  or “68F and 20C”, then the conversion should be simply HDDF = 1.8 * HDDC and CDDF = 1.8 * CDDC, since the values are incremental above a base temperature and not an absolute temperature.  In a literal sense, these are actually Rankine DD and Kelvin DD respectively.

Larry Degelman
Professor Emeritus of Architecture
Texas A&M University.

From: Christian Stalberg 
Sent: Saturday, October 27, 2012 8:54 AM
To: bldg-sim at lists.onebuilding.org 
Subject: [Bldg-sim] converting CDD from Celsius to Fahrenheit

Can anyone tell me what the conversion equation would be for going from cooling degree days in Celsius to same in Fahrenheit?





Christian Stalberg
Natural Intelligence, LLC  
Tel. 919.986.9237

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