Ventilation Rates

Question

On the spreadsheet, ProgramInput tab, column AE is CFM/SF.  What is this column?  I can see two possibilities:  1) you're using the more recent ASHRAE 62 where the ventilation is a combination of CFM/SF and CFM/Occ.  or, 2) this column is supposed to capture thermal load.  But the latter would require much more detailed calculations, involving the U-values of building assembly, solar insolation, storage effects, and different procedures for summer and winter.  In other words, more than one column to calculate, and also some functional dependence on the sensible and latent loads (not a totally independent user-input).
Basically I'm wondering what the CFM/SF column is supposed to capture.  And if it's not for thermal load, is there any way to capture thermal load on the spreadsheet? 

Response

When I set the spreadsheet up I was thinking of CFM/Occ, but wanting to in some way turn that into a xx/SF. I guess the result was somewhat of a “half-way-to-somewhere”. The right thing is, of course, two columns, one being CFM/SF and one being CFM/Occ with the user choosing whichever is appropriate – both are used in practice.

Thermal load from interior sources could certainly be estimated as the sum of occupant load, lighting and equipment. The latter two have their own columns in the electrical portion I believe and could be converted to BTUs.