Re: [EnergyPlus_Support] set purchasing cooling as backup cooling

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

The current free cooling components assume that the chilled water loop will 
operate either a chiller or the free cooling heat exchanger but not both.  To 
model your situation, put two cooling coils in series in the main air branch.  
Connect the first cooling coil to a chilled water loop served by the free 
cooling heat exchanger.  Connect the second cooling coil to a chilled water 
loop served by a chiller.  If the first coil meets the desired supply air 
setpoint, then the second coil should remain off.

Mike


On 23 Feb 2005, at 20:54, Zhen Tian wrote:

> 
> Hi, everyone:
> 
> I am simulating a building which can utilize cooling directly from condensor
> loop (cooling tower and so on). But in the summer season there are days the
> cooling load can not be matched.  So there is need to provide chilled water as
> backup cooling source.
> 
> Could somebody tell me how to setup purchased cooling as backup cooling source
> in EnergyPlus? I mean, the cooled water from cooling tower is still the main
> cooling source. When the cooled water temperature from cooling tower is not low
> enough, then the purchased cooling can mixed with water from cooling tower and
> lower the cooled water temperature enough.
> 
> Thanks a lot in advance.
> 
> Regards,
> 
> Zhen
> 
> 
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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