Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Apparently there are a number of TMY3 weather files that don't have any ASHRAE design conditions in them. If I knew that at one point, I had forgotten it. When this happens, BEopt (or, really, OpenStudio-HPXML) will calculate the 1% and 99% design conditions from the 8760 hourly weather data to use for HVAC design load and autosizing calculations, in which case it throws a warning because those calculations differ from the approach ASHRAE uses to develop design conditions. But there isn't any other option.
Since the BEopt user cannot do much about this warning (other than modifying the weather file), we should really suppress the warning. We'll do that for the next BEopt release. Thanks for bringing this to my attention.
For what it's worth, I looked through all the U.S. TMY3s and found 151 of the 1011 have no design conditions. For Connecticut, 3 of the 7 have no design conditions.
