Re: [EnergyPlus_Support] about the humid ratio control and the preheat desigh set temperature

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

1.  The system sizing calculations need some sort of humidity ratio to work 
with, so the "Central heating design supply air humidity ratio {kg-H2O/kg-air}" 
is required.  Enter a reasonable value consistent with the specified supply air 
temperature.  Changing this value will have only a minor impact on the sizing 
results.

2.  If there is no preheat coil, the "Preheat design set temperature {C}" field 
in SYSTEM SIZING is ignored if there is no preheat coil in the system model.  

Mike


On 2 Nov 2004, at 14:44, beyangj wrote:

> 
> 
> Dear,
> 
> In my simulation model, the Zone heating design supply air humidity 
> ratio doesn't need to be controlled. I set the Fieild:Zone heating 
> design supply air humidity ratio as blank, but the following error 
> message was given: 
> ** Severe  ** Error detected in Object=ZONE SIZING, name=SP1
> **   ~~~   ** Field [Zone heating design supply air humidity ratio] 
> is required but was blank
> 
> In my model, there is no  preheat coil, so I didn't control the 
> preheat design set temperature, and I set this field as blank. Also 
> the error message about it was given as follow:
> ** Severe  ** Error detected in Object=SYSTEM SIZING, name=VAV SYS 1
> **   ~~~   ** Field [Preheat design set temperature] is required but 
> was blank
> 
> For these two fields, they both can't be set as blank, but they 
> don't need to be controlled in my model, how can I set these two 
> fields? 
> 
> Best,
> 
> Stewart 
> 
> 
> 
> 
> 
> 
> 
> 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.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 



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




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