It seems your goal is a model of an existing building that can be calibrated to some data you have. Autosizing will not work well for you unless the actual
system happens to match the autosize selection. Entering existing mechanical system components will tell you how the system may be under/over sized as E+ will still calculate zone loads for comparison. With existing equipment as a base model it will be easier
to evaluate specific equipment changes.
That said, autosize models are sometimes easier to use to get things working, after which you can modify components individually and quickly identify model
problems rather than have to identify random sources of model errors.
Ned Lyon, P.E. (MA, WV)
Staff Consultant
SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct
617.285.2162 mobile
781.907.9009 fax
www.sgh.com
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Tuesday, June 16, 2015 12:14 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] autosizing vs hardsizing HVAC system, which one is better choice?
I was wondering, what is the best way to model HVAC equipment for an already existing building? Is it better to select autosizing and let EnergyPlus to do the job OR entering all
the data from manufacturers' manuals? Hardsizing will also include getting the coefficients for boilers, VRF system, heat recovery elements etc.
If Autosizing and using default equations/coefficients is the answer then will it make calibration a challenging task to perform?
Thanks
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Posted by: "Edward G. Lyon" <EGLyon@xxxxxxx>
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