Re: [EnergyPlus_Support] warning about air flow rate of cooling coil

["Michael J. Witte" <mjwitte@xxxxxxxx>]

It is hard to say why without seeing the input file.  The detailed chilled 
water coil model has difficulty autosizing for very large airflow rates.  

My guess is that there is something wrong with the sizing inputs.  Check the 
eio output file.  Do the zone sizing results look reasonabe?  Do the component 
sizing results for the fan coil unit look reasonable?  

If those are good, the problem may be with some of the other coil details.

The easiest solution is to change the coils to be COIL:WATER:COOLING.  In v2.1, 
COMPACT HVAC:ZONE:FAN COIL will let you specify which coil type to use and 
generate the inputs automatically.

Mike


On 14 Nov 2007 at 9:10, olifpp wrote:

> Hi everybody!
>     I am simulating the energy consumption of a building.This building 
> is about 4500m2,fan coil system.Plant equipment are chiller and 
> boiler.I do the simulation with autosize.I divided it into 3 
> zones.There is no errors but there is a warning "** Warning ** 
> COIL:Water:DetailedFlatCooling in Coil =* COOLING COIL
>    **   ~~~   ** Air Flow Rate Velocity has greatly exceeded upper 
> design guidelines of ~2.5 m/s
>    **   ~~~   ** Air MassFlowRate[kg/s]=0.000000
>    **   ~~~   ** Air Face Velocity[m/s]=0.000000
>    **   ~~~   ** Approximate MassFlowRate limit for Face Area[kg/s]=-
> 203849.666002
>    **   ~~~   ** COIL:Water:DetailedFlatCooling could be 
> resized/autosized to handle capacity".
> It happende to all the cooling coils.I wandered how this happen.Is 
> there something wrong about the control?
>     Thanks for help! 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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