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Re: [EnergyPlus_Support] HVAC error
The coil inlet air temperature is already 12.3C, why is the cooling coil
inlet temperature so low? Is cooling really needed at this time? What
are the zone temperatures? Report the cooling coil node inlet
temperature and any other node temperatures upstream of the coil to
determine why the air is so cold. Also look in the csv file at time
01/11 8:00 and see if the coil is actually on. I have seen before where
this error occurs and the coil was not actually on (and this may have
been fixed, I can't recall). In that case you could ignore the warning.
fady_sherif_adly wrote:
>
> Hello all
>
> I have a problem with modeling HVAC systems for my simulation. I'm
> trying to simulate a normal residential flat and my problem is twofold;
>
> a) I don't know which fields to use to most closley approximate a
> normal split type air conditioning unit found in homes.
>
> b) I keep getting the following error messages when I use a thermostat
> object, a Zone:Unitary object and a System:Unitary object like it says
> in the "getting started" .pdf file:
>
> ** Warning ** Coil:Cooling:DX:SingleSpeed "MY ROOM SYSTEM COOLING
> COIL" - Full load outlet air dry-bulb temperature < 2C. This indicates
> the possibility of coil frost/freeze. Outlet temperature = 1.38 C.
> ** ~~~ ** ...Occurrence info = YEAR, 01/11 07:45 - 08:00
> ** ~~~ ** ... Possible reasons for low outlet air dry-bulb
> temperatures are: This DX coil
> ** ~~~ ** 1) may have a low inlet air dry-bulb temperature. Inlet air
> temperature = 12.320 C.
> ** ~~~ ** 2) may have a low air flow rate per watt of cooling
> capacity. Check inputs.
> ** ~~~ ** 3) is used as part of a HX assisted cooling coil which uses
> a high sensible effectiveness. Check inputs.
>
> This error message is repeated over a thousand times for different
> occurances and zones.
>
> Can anyone help?
> Thanks for your time.
> Fady Sherif Adly
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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