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[EnergyPlus_Support] Re: Warning Message: air volume flow per cooling capacity out of range
All,
I was able to get the model to run when I changed the "Rated Air Flow Rate" for each of the 5 coils.
I'm now getting a lot of errors - 950,000.
example:
************* ** Warning ** Coil:Cooling:DX:SingleSpeed "9085 AHU COOLING COIL" - Air volume flow rate per watt of rated total cooling capacity is out of range error continues...
************* ** ~~~ ** This error occurred 228990 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=2.055983E-005 Min=1.922954E-005
*************
************* ** Warning ** Coil:Cooling:DX:SingleSpeed "9085 AHU COOLING COIL" - Full load outlet temperature indicates a possibility of frost/freeze error continues. Outlet air temperature statistics follow:
************* ** ~~~ ** This error occurred 10568 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=1.99968 Min=-11.578451
As you can see, none of these errors occur during "warmup" or "sizing".
I don't know that there's a way to get rid of these errors with the "work around" that I'm using. I also looked at the outputs of the model and it doesn't seem to be effecting the outputs. Can anyone offer guidance?
Thanks again.
Brendan
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "bcmcgr" <bcmcgr@...> wrote:
>
> Don,
>
> I do have coils:cooling:DX:Singlespeed. I have 5 of them. In this case the "Rated Total Cooling Capacity" is a set number (Watts) but the "Rated Air Flow Rate" is "autosize". This is why I was drawn to changing the infiltration input, as it was a set number.
>
> I'll try changing this number to get the model to run right.
>
> Brendan
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Don Shirey <shirey@> wrote:
> >
> > "ZoneInfiltration:DesignFlowRate" defined infiltration of outdoor air into the zone... that is not the issue here.
> >
> > You must have a DX cooling coil object somewhere in your EnergyPlus
> > input data file, don't you (Coil:Cooling:DX:*) ?
> >
> > It has rated airflow rate and rated capacity inputs.
> >
> >
> > On 2/10/2011 3:28 PM, bcmcgr wrote:
> > > James,
> > >
> > > Basically what I was asking was that if I could just change the "Zone Airflow" -> "ZoneInfiltration:DesignFlowRate" to make the (m3/s)/W fall within the range stipulated by E+. In the E+ idf file that is the only location that I can find to change the supply flow. It seems to be where E+ pulls it from DB.
> > >
> > > I was able to change those values iteratively to get within the range and keep my heating and cooling capacities at actual size.
> > >
> > > Is there another place within E+ to modify the "supply air flow rate"?
> > >
> > >
> > > Brendan
> >
>
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