RE: [EnergyPlus_Support] Pre-conditioning days

["Michael J. Witte" <mjwitte@xxxxxxxx>]

Umesh:

EnergyPlus takes the first day of any simulation (whether it is a 
design day or a run period) and repeats it until the results repeat 
(or until the max warmup days are reached).  So, the result is the 
same as if you experienced this same day for many days in a row.  
Perhaps the other program does not intialize the same way?  If you 
want to initialize EnergyPlus to a certain condition and then see the 
results of a single day with different conditions, you need to create 
a custom weather file with a period of your initial conditions prior 
to the day of interest.

Mike

On 9 Dec 2002, at 9:30, Umesh Patel wrote:

> Hi Mike
> 
> I'm trying to compare the room conditions attained over a particular
> day of the year, and compare the results attained from EnergyPlus to
> those attained from another energy simulation program, (EDSL's
> building designer), one of the things I've noticed with the initial
> results was a large mis-match at the beginning of the day (as I'm
> using constructions that produce a large thermal lag (up to 6 hrs)
> this shouldn't be happening.
> 
> The only thing that seems to vary is the number of pre-conditioning
> days, as the weather data is the same for both programs.
> 
> Regards
> 
> Umesh
> 
> 
> [Non-text portions of this message have been removed]
> 
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