Re: [EnergyPlus_Support] an interesting phenomenon about cooling coils

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

It sounds like the heat recovery controls and the cooling coil controls are 
fighting each other.  Check the control setpoints for the cooling coil and the 
outside air controller.  If you cannot eliminate the problem, please upload the 
input file to the yahoo files area or send (zipped) to energyplus-
support@xxxxxxxx

Mike


On 6 Nov 2006 at 16:17, Zhen Tian wrote:

> Dear All,
>    
>   I found an interesting phenomenon when I modelling cooling coil connecting
> directly to the cooling towers.
>    
>   I simulated building energy use in the dry climates. Cooling coil (Coil:
> water:cooling) and radiant slab were both connected to the cooling towers. A
> constant air sytem with 100% air and heat recovery provides ventilation for
> the building spaces.  Supply air temperatuer is 16C and heat recovery setpoint
> is 14.3C. Condenser loop mimimum water temperatuer is about 10C. When the air
> temperature out of heat recoveryy is about 14.3C, the cooling coil always
> cooled the supply air again to temperature of 14.29C or 14.28C, by checking
> the system node tempratures.  This causes the condenser supply pump always
> running and higher energy use. This happens when I use the climate data of
> Helena, MT(Zone 6B) and Salt Lake City, UT (Zone 5B). But this phenomenon did
> not happen with climate data of Calgary (Zone 7) and Vancouver (Zone 5C).
>    
>   Has anybody experienced this before and could someone tell me what is the
> problem of this issue?
>    
>   Thanks a lot.
>    
>   Regards,
>    
>   Zhen
>     
> 
>  
> ---------------------------------
> Everyone is raving about the all-new Yahoo! Mail.
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
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> 
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> 
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> 
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> "search" button.
>  
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> 
> 
> 
> 
> 
> 


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





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