[EnergyPlus_Support] Re: Cooling a zone without affecting humidity

["Elmer Morrissey" <elmofuddly@xxxxxxxxx>]

Hello,

So in order to cool my zone to 21C without affecting the zone's
moisture content, I tried using Radiant Cooling with a floor slab. 

I used Hydronic Radiant Cooling. Unfortunately, 'condensation' errors
were flagged by E+ and the chilled water system was turned off (zone
temps remained at 26C). 

I kept 'up-ing' the chilled water setpoint until the condensation
errors finally disappeared at 19C. Needless to say, even with a very
large flowrate, this isn't a large enough temperature differential for
me to cool the zone to the 21C setpoint. 

Can anyone help me with this problem as it is extremely important that
I clear this issue as soon as possible.

Kind regards

-Elmer

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent"
<brent_griffith@...> wrote:
>
> I think you should be able to use radiant cooling.  Check out the
> example files that start with RadLowTemp*.  A savvy modeler could
> approximate a chilled beam by using a ConvectionCoefficients object to
> increase the surface convection heat transfer coefficient on the cooled
> surface(s). 
> 
>  
> 
>  
> 
>  
> 
> ________________________________
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Elmer Morrissey
> Sent: Saturday, October 28, 2006 8:46 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Cooling a zone without affecting humidity
> 
>  
> 
> Hello all,
> 
> Is there any object in E+ whereby I can cool the zone without
> affecting the moisture content in any way. I was hoping to use
> something like a chilled beam.
> 
> I want to simulate the performance of a heat recovery unit, however
> the supply conditions are 26C. Despite this, the zone is actually
> maintained at 21C. Is there object that I can use? I tried using a
> negative number in the Gains section but it made E+ crash!
> 
> Any help would be greatly appreciated. Also, if it can't be done,
> could you tell me that too.
> 
> Kind regards
> 
> -Elmer
> 
>  
> 
> 
> 
> [Non-text portions of this message have been removed]
>





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