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RE: [EnergyPlus_Support] Uncertainty analysis
Peter,
Interesting subject line! Coming from an experimental background I am always surprised at the dearth of error analysis in this field.
I assume that you want to do input perturbations on weather data, but the weather processing and/or converting routines are not set up to change the values. So I think that you'll have to build another "wrap" for altering the weather files. The weather file data and formats are documented in AuxiliaryPrograms.pdf. EnergyPlus .epw files that are distributed are more verbose than what is actually needed for the program. I have done this sort of thing with weather data from measurements and it isn't too hard. I created two new files, one "high" and one "low", where all the data were perturbed up or down by their respective measurement uncertainty. I suppose one could very quickly get to zillions perturbed weather files depending on how the input are parameterized.
Good luck!
Brent Griffith
National Renewable Energy Lab
-----Original Message-----
From: Peter G. Loutzenhiser [mailto:post@xxxxxxxxxxx]
Sent: Wednesday, January 26, 2005 8:24 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Uncertainty analysis
I have built a "wrap" for EnergyPlus in MatLab to implement a sensitivity and
Monte Carlo analysis to estimate output error due to input paramater uncertainty
(boundary conditions, dimensions, thermophysical properties, etc.). For the
first part of our study, guarded zones were used for all surfaces of the test
cell and so weather conditions were unimportant. But in subsequent
experiments, weather will be an important parameter that will need to be
implemented into this wrap. Is there anything similar to the "RunEP.bat" for
the weather processing that can be executed in a command line of another
program, or does the purchase of the source code also include the source code
for the weather processor; in order to create a batch file?
Thank you for your help.
Peter Loutzenhiser
PhD Candidate
EMPA Material Science and Testing
Iowa State University
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