Re: [EnergyPlus_Support] Rated air volume flow rate per watt of ratedtotalcooling capacity out of range

There's the answer, that unit has a variable compressor (let me know if
I am wrong, I only looked at the first web page). VRV systems modulate
the compressor speed, no real need to worry about the air flow volume
ratio. The system maintains a constant suction temperature and therefore
can not freeze the coil. E+ can not yet simulate a VRV (VRF) AC system.

Your only option for now is to raise the air flow per ton as you have
suggested. Take a close look at your results when you are finally able
to perform the simulation. I am interested to know how close you got to
simulating VRV AC system performance.

Adriano Carotenuto wrote:
>
> Dear Richard,
>
> It´s Daikin Manufacturer indoor unit model FXFQ125MVE (ceiling mounted
> cassete type - multi-flow)
> Specifications:
> Cooling capacity: 14000 W
> Air flow rate: 30 m3/min;
> I am trying to simulate the thermal zone with four indoor units (56000
> W) and maximum air flow rate (120 m3/min).
>
> The manual is Engineering Data, Nr ED 39-428B.
>
> The manual on the web site link is different from what I am using.
> http://www.daikinac.com/commercial/docsEngineering.asp?sec=docs&page=58
> <http://www.daikinac.com/commercial/docsEngineering.asp?sec=docs&page=58>
>
> I will send you the page with the data above.
>
> Thank you,
>
> Adriano Carotenuto.
>
>
> ----- Original Message -----
> *From:* Richard Raustad <mailto:RRaustad@FSEC.UCF.EDU>
> *To:* EnergyPlus_Support@yahoogroups.com
> <mailto:EnergyPlus_Support@yahoogroups.com>
> *Sent:* Wednesday, December 03, 2008 3:45 PM
> *Subject:* Re: [EnergyPlus_Support] Rated air volume flow rate per
> watt of rated totalcooling capacity out of range
>
> Would you also please provide the manufacturer name and web site
> link so
> the E+ team can look at this data? Thank you.
>
> Edwin Lee wrote:
> >
> >
> > Does the simulation continue to run fine? Even though this is a
> > severe error, I don't think it will cause the simulation to
> cease, it
> > is just letting you know that this was encountered during the
> sizing
> > runs as it moves ahead with the simulation.
> >
> > Edwin
> >
> > On Wed, Dec 3, 2008 at 11:33 AM, Adriano Carotenuto
> > <adriano.carotenuto@terra.com.br
> <mailto:adriano.carotenuto%40terra.com.br>
> > <mailto:adriano.carotenuto@terra.com.br
> <mailto:adriano.carotenuto%40terra.com.br>>> wrote:
> >
> > Dear All,
> >
> > I am trying to simulate a thermal zone with Compact HVAC: Zone:
> > PTHP by entering the data from the manufacturer catalogue: 56000 W
> > rated total cooling capacity (gross) and 2,0 m3/s rated air
> > volume flow rate.
> > But, when I run the simulation, comes up a severe error as listed
> > below and the program stops running.
> >
> > Severe ** Sizing: COIL:DX:COOLINGBYPASSFACTOREMPIRICAL
> > "2O_PAV._ZONA1 PTHP COOLING COIL": Rated air volume flow rate per
> > watt of rated total cooling capacity is out of range. See
> > Input-Output Reference Manual for valid range.
> >
> > According to manual, the range is between 0,00004027 and 0,0006041
> > m3/s/W.
> >
> > The value of the manufacturer catalogue is 0,00003571 m3/s/W,
> > below the Energyplus range.
> >
> > Is there some way to "bypass" this error or to modify these limits
> > in the program?
> >
> > Please, I would appreciate if someone could help me in this
> question.
> >
> > Thank you.
> >
> > Adriano
> >
> >
> >
>
> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
> <http://www.fsec.ucf.edu>
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
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--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years