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[EnergyPlus_Support] Unable to autosize VAV dx coil
I have uploaded files for a 2 story building with a DX rooftop VAV
unit. We are applying for LEED certification of this building and
need to show energy savings over the minimum ASHRAE 90.1
requirements.
I am not sure why E+ will not autosize the DX coil for this system.
I have a sunlit area too small error which I have been unable to
correct, perhaps this is also the problem with the autosize.
Solutions to both issues would be greatly appreciated.
It had been running, until I updated the ground temperatures and
changed the design day schedule to be always on. When the design day
schedule was set to be off during unoccupied hours, the warm-up
loads were causing the VAV box and reheat coil to be EXTREMELY over
sized (4-5 times bigger than required.) The VAV dampers were not
opening past minimum except for the morning hours.
That brings up another question, is there any way to model a single
duct VAV system that comes on at minimum flow during unoccupied
hours to meet a night setback temperature?
Michelle Smith
Belle Engineering, LLC
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