[EnergyPlus_Support] Re: Chilled Beams need a separate water control loop

["j12kemp" <j12kemp@xxxxxxxxxxxx>]

Or build two models and use the chiller + (cooling tower) energy from the single cilled water system and the model with two chillers for the rest of the system energy. 

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Eddie Corwin <ecorwin@...> wrote:
>
> 
> 
> 
> I would go with the two chiller approach, but modify the performance curves so 
> that they better reflect the actual conditions.
> 
> 
> 
> 
> 
> ________________________________
> From: "James V Dirkes II, PE" <jim@...>
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Sent: Thu, September 30, 2010 1:56:43 PM
> Subject: RE: [EnergyPlus_Support] Chilled Beams need a separate water control 
> loop
> 
>   
> Thanks, Brent.
>  
> Two chillers changes part load relationships a lot.
> Lower water temp to the chilled beams probably affects their performance, too, 
> but I suspect the bigger impact will be on the chiller performance.
>  
> I think Iâ??ll go with the one chiller approach.
>  
> This might be a nice item to add to the development list, if itâ??s not already on 
> it!
>  
> 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 Griffith, Brent
> Sent: Thursday, September 30, 2010 12:36 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: RE: [EnergyPlus_Support] Chilled Beams need a separate water control 
> loop
>  
>   
> In E+, you either end up needing to use two separate chilled water loops (and 
> two chillers), or ignore the higher temp water for the beams and use one supply 
> temperature.   
>  
> From:EnergyPlus_Support@xxxxxxxxxxxxxxx 
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of jvd2pe
> Sent: Thursday, September 30, 2010 7:45 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Chilled Beams need a separate water control loop
>  
>   
> Dear Forum,
> 
> In a typical chilled water system using CHILLED BEAMS, you need:
> * a chilled water loop for air handler coils at ~45F / 7C
> * another chilled water loop for the chilled beams at ~60F / 15C
> * both served by single chiller
> 
> Does anyone have suggestions about how to set this up in E+?
> 
> Thanks in advance!
>




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