Hhhmmm, sounds very confusing for something that should be simple and direct, in my humble opinion. So the "Start Year" doesn't affect the simulation in any discernible way? So what's the purpose for adding it to the IDD?
The "Day of Week for Start Day", whether it's defined in the
weather file or set by the user, strikes me as an odd input that's
much better achieved by setting the Year. I mean, one would have
to check the calendar to know what Day of Week is the first day of
the weather file, but if you know the Year then you can calculate
the Julian Day and get the Day of Week for all the days in the
weather file. As far as giving flexibility to override the
starting Day of Week, setting the Year would also provide that as
well.
Joe
Joe Huang White Box Technologies, Inc. 346 Rheem Blvd., Suite 205A Moraga CA 94556 yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx http://weather.whiteboxtechnologies.com for simulation-ready weather data (o) (925)388-0265 (c) (510)928-2683 "building energy simulations at your fingertips"
Joe,
The "Start Year" input field of the RunPeriod object seems to just be meta-data that the user can set. I say this because after some testing for a single simulation and repeated simulations using the "Number of Times Runperiod to be Repeated" input field of the RunPeriod object, the entered start year doesn't appear in the ESO output file and therefore the CSV time series output file. The only output file that references the starting year for simulations is the EIO file.
The "Day of Week for Start Day" input field of the RunPeriod object provides flexibility for the user to override the starting day of the week specified in the EPW file. Leaving this field blank would cause the simulation to use the starting day of the week specified in the EPW file.
In my testing, altering the "Start Year" input field didn't change the starting day of the week, only the "Day of Week for Start Day" did. EnergyPlus isn't referencing the "Start Year" input field to then know what the starting day of the week should be, it's just reading the "Day of Week for Start Day" input field.
I hope that clears up some of your questions.
Regards,
Aaron BoranianSenior Energy Engineer, Big Ladder Software
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Posted by: Joe Huang <yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx>
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