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Folks from PNNL working on 90.1 analysis published two good papers that detail the modeling approach for each addendum taking 90.1-2004 to 90.1-2007 and 90.1-2007 to 90.1-2010. Those documents are:

These were created to document the DOE Commercial Prototype Models, but the modeling approaches are a useful reference for anyone needing to understand how a particular part of 90.1 might be interpreted into energy model inputs.