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[EnergyPlus_Support] Utility-bill calibration



Hello Everyone,
Can anyone direct me to some materials or papers (if there are any) 
where I can read about the Utility-bill calibration techniques, please?

I know that a certain set of data like weather data, materials and 
constructions, temperature setpoints, schedules, number of people, pump 
and fan flows, lights, equipment and any other interior and exterior 
powers must be collected in addition to utility bills. But I still have 
some questions.
If not all data can be collected, what assumptions could be made safely?
How to consider zoning? Should the model be single or multi zone?
What about the level of infiltration?
When is it said that the model fits in terms of accuracy? And if I don't 
get the necessary accuracy, which data values should be altered? 
Temperature setpoints or schedules? Is there any specific order?

If you have any experience with model calibration procedure, please 
share. Any help is highly appreciated!

Thank you!
Miroslav


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