The input object ZoneVentilation can be
used to mimic free cooling as from opening a window. (But you could quickly
end up with a heating load.)
That warning gets ignored by most users.
From:
Sent: Monday, November 16, 2009
12:42 PM
To:
Subject: [EnergyPlus_Support]
Air-cooled condenser inlet dry-bulb temperature below 0 C.
Earlier this question was posted by John Grando on Nov
5. I am also having similar prpblem for Atlanta Climate. I hope that somebody
will answer. Here is the question:
I have an issue with a HVAC Template: PTAC system. I get the below warning for
** Warning ** Coil:Cooling: DX:SingleSpeed "2-4L PTAC COOLING COIL" -
Air-cooled condenser inlet dry-bulb temperature below 0 C. Outdoor dry-bulb
temperature = -2.20
** ~~~ ** ... Occurrence info = WINTERDESIGNDAY, 01/02 11:45 - 12:00
** ~~~ ** ... Operation at low ambient temperatures may require special
performance curves.
It seems like I have an issue with cooling when the outdoor temperature should
be low enough to not need a PTAC unit. Can anyone guide me on how to model
someone opening a window to let in cold air or some type of free cooling mode
so that the PTAC unit does not try to operate? Thank you.
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