[EnergyPlus_Support] Re: Warning Message: air volume flow per cooling capacity out of range

["bcmcgr" <bcmcgr@xxxxxxxxx>]

Thank you both for your prompt help. It is definitely appreciated.

Can either of you explain to me how you "ensure that the maximum supply flow is changed accordingly". I can definitely change the max to design conditions but I'm not sure how to do this in either E+ or DB.

Thanks again.

Brendan

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "James V Dirkes II, PE" <jim@...> wrote:
>
> Dear Brendan,
> 
>  
> 
> The airflow / watt warning is a common one for me, also, for manually sized
> systems.
> 
>  
> 
> I have not tried it yet, but the E+ Help desk suggested that I put two coils
> in series to eliminate the warning.  This effectively will leave the airflow
> the same but cuts the coil capacity in half for each coil. it might work!
> 
>  
> 
> p.s., This fix will probably not significantly affect your results unless
> you have accurate part load curve information for your coils.  If you DO
> have that information, you may be able to cobble some part load coefficients
> (different for each coil) that will do the trick.
> 
>  
> 
> The Building Performance Team
> James V. Dirkes II, P.E., LEED AP
> 1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653
> 
>  
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of bcmcgr
> Sent: Wednesday, February 09, 2011 2:15 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Warning Message: air volume flow per cooling
> capacity out of range
> 
>  
> 
>   
> 
> "Rated air volume flow rate per watt of rated total cooling capacity is out
> of range."
> 
> I'm working on a LEED project using Design Builder and my Proposed model
> gets the above "Severe Error" when the model is run in E+. I can get around
> this by having Design Builder "autosize" my HVAC system but then when I
> check the HVAC system sizing output from E+ my sizes (capacities) are much
> less than the actual design. 
> 
> It's important to note here that I'm modeling the minimum ventilation
> (outside air) per ASHRAE 62.1 (ie per person and per area) which is much
> smaller than the capabilities of the system. 
> 
> Has anyone encountered this in the past? Should I just submit the model as
> if it's autosized? 
> 
> And, of course, I'm being rushed to submit by Friday. Any help on this is
> much appreciated.
> 
> Thanks in advance. 
> 
> Brendan
>




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