[EnergyPlus_Support] Weather Data, Leap Years

[Linda Lawrie <linda@xxxxxxxxxx>]

Does an EPW file need to contain the Feb. 29 day for leap year
simulation?

There are two keys to this.  First, in the Weather file (EPW),
you must select the option to perform a leap year simulation.  The
Holidays header definition for the EPW file:

HOLIDAYS/DAYLIGHT SAVINGS,
     A1, \field LeapYear Observed
      \type choice
      \key Yes
      \key No
      \note Yes if Leap Year will be observed
for this file
      \note No if Leap Year days (29 Feb) should
be ignored in this file
     A2, \field Daylight Savings Start Day
     A3, \field Daylight Savings End Day
     N1, \field Number of Holidays (essentially
unlimited)
     A4, \field Holiday 1 Name
     A5, \field Holiday 1 Day
     \note repeat above two fields until Number of
Holidays is reached

The first field will need to have a value of "Yes" before any
Feb 29 will be read from the EPW file.  If this field is No, then
any Feb 29 on the weather file will be ignored.

Secondly, there must be a Feb 29 in the weather file.  If not, then
there is no way EnergyPlus will try to "make" a Feb 29 to
simulate a leap year.

Really, this is an option to be able to "ignore" a file that
has an existing Feb 29 rather than an option to try to add a Feb 29 to a
weather file that doesn't contain one.

None of the above selection appears in any form in the IDF file, by the
way.  You can choose to ignore or accept Holidays and Special days
(which is also information included in this EPW header record) and/or
Daylight Saving Period but not a similar option for Leap Years.



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