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Re: [EnergyPlus_Support] Re: Cooling a zone without affecting humidity



Elmer:  

To answer your initial question, you can use OTHER EQUIPMENT to add a negative 
(cooling) load with no latent impact.  But this would not be thermostatically 
controlled.  

I am a bit confused as to what the actual goal is here.  Would you please send 
me the test description for this case?  You may send it to energyplus-
support@xxxxxxxx.

Mike


On 1 Nov 2006 at 20:20, Elmer Morrissey wrote:

> 
> Hi Justin,
> 
> My sincere thanks for your reply. 
> 
> I'm afraid I cannot alter the AHU in the test. It is necessary to
> model the specific compenents themselves and node conditions for
> compliance with a standard.
> 
> I have reduced the RH levels in the zone to ~40%. However, the cooling
> load by the hydronic tubes is never larger than 2.3kW. How can I make
> one of these cooling devices as large as possible in order to reduce
> zone temperatures from 26C to 21C to offset the air's sensible gain
> (air is supplied at 27C).
> 
> Kind regards
> 
> -Elmer
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Spencer, Justin"
> <Justin_Spencer@...> wrote:
> >
> > Elmer,
> > 
> > If you have any sustained latent loads, then what you are trying to do
> > is not possible without separately treating the latent loads.  If you
> > have no latent cooling capacity, then the humidity will rise until the
> > air in the space is fully saturated.  At that point, it is impossible to
> > do any sensible cooling without also doing latent cooling.  So if you're
> > not providing enough latent capacity, you won't be able to do any
> > sensible cooling.  
> > 
> >  
> > 
> > It is possible, on the other hand, to set up a separate loop for
> > providing latent control, and then have a sensible-only system for
> > controlling temperature, the DOAS approach.  To do this, you could put a
> > dehumidification component into an air loop that provides ventilation
> > air to the space (it's possible for this to be latent-only with reheat),
> > then use the low temperature radiant hydronic system that Brent pointed
> > out to do most of the sensible cooling.  
> > 
> >  
> > 
> > Justin
> > 
> > 
> > 
> > [Non-text portions of this message have been removed]
> >
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
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> 
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> 
> Attachments are not allowed -- please post any files to the appropriate folder
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> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the
> "search" button.
>  
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> 
> 
> 
> 
> 
> 


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





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