[EnergyPlus_Support] Re: Cooling Coil Error

["asheaffe" <sheaffer@xxxxxxx>]

Fred,

Thanks for the quick response.  The reason I am having this issue is 
because I am doing a parametric study in different climates.  Does 
this mean that for each climate I need to adjust the target hum 
ratio in the system sizing?  

I would really like to avoid doing this.  Ideally, I just want to 
make sure that I have 55F air downstream of the system fan and 
frankly, I don't care too much about the humidity conditions.  
However, the system sizing object forces me to keep going back and 
adjusting the hum ratio to mitigate errors.  How do other people do 
this for parametric studies?  Can I just set a SHR to avoid this?  
Should the SHR be different for each climate?  



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Fred Buhl <wfbuhl@...> 
wrote:
>
> This is coming from the coil autosizing calculation. The coil 
entering 
> conditions
> are the mixed air conditions: recirc air (if any) mixed with 
outside 
> air. The outlet conditions
> are what you told the program in your System Siszing input as your 
> desired design cooling
> supply air condiitons. So the message is saying that the entering 
> moisture content is less
> than the leaving moisture content. Since a coil can't add 
moisture, the 
> choice is made to
> try to remove 1/2 of the entering moisture.
> 
> Fred Buhl
> 
> asheaffe wrote:
> > I am getting the following error on a coil:water:cooling
> >
> >
> >
> >    ** Warning ** SizeWaterCoil: Coil="EXTERIOR ZONES COOLING 
COIL", 
> > Cooling Coil has leaving humidity ratio > entering humidity 
ratio.
> >    **   ~~~   ** ..will be sized for 50% of entering humidity 
ratio.
> >    ** Warning ** SizeWaterCoil: Coil="EXTERIOR ZONES COOLING 
COIL", 
> > Cooling Coil has part wet, part dry conditions.
> >    **   ~~~   ** ..will be sized for 50% of design entering 
humidity 
> > ratio.
> >    ** Warning ** SizeWaterCoil: Coil="OPERATING ZONE COOLING 
COIL", 
> > Cooling Coil has leaving humidity ratio > entering humidity 
ratio.
> >    **   ~~~   ** ..will be sized for 50% of entering humidity 
ratio.
> >    ** Warning ** SizeWaterCoil: Coil="OPERATING ZONE COOLING 
COIL", 
> > Cooling Coil has part wet, part dry conditions.
> >    **   ~~~   ** ..will be sized for 50% of design entering 
humidity 
> > ratio.
> >
> >
> >
> > What does this error mean?  In terms of the leaving humidity 
ratio, 
> > are we talking about the system design humidity ratio?  This 
error 
> > is totally detroying the performance of the cooling coil.
> >
> > Thanks,
> >
> > Andrew
> >
> >
> >
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> >
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> >
> > Attachments are not allowed -- please post any files to the 
appropriate folder in the Files area of the Support Web Site.
> >
> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf 
and press the "search" button.
> >  
> > Yahoo! Groups Links
> >
> >
> >
> >
>




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