Re: [EnergyPlus_Support] Sizing calculation

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

It is difficult to say for sure without seeing the input file.  The most likely 
cause is that the cooling supply air temperature in the ZONE SIZING object is 
colder than what the DX cooling system can actually produce.  If that is not 
the problem, then I would need to see the input file.  You may upload it to the 
files area of the yahoo group, or e-mail it as a zipped attachment to 
energyplus-support@xxxxxxxx

Mike


On 4 Oct 2006 at 20:32, aboyemeplus wrote:

> Hi, 
> 
> I am performing system sizing calculations for a 3-zone building 
> where only one of the zones is conditioned. 
> 
> *Temperature control is provided with a dual setpoint thermostat. 
> *The selected unitary equipment object  
> is "FURNACE:BLOWTHRU:HEATCOOL". 
> *The following parameters are set the same on both the Zone and 
> System levels:Cooling/Heating Air Flow Methods, Cooling/Heating 
> Supply Air HR, and Cooling/Heating. 
> *The HVAC unit performance parameters are set to "Autosize" when 
> ever that option is applicable. 
> 
> With this input, the sizing routine comes up with a max flow rate 
> that meets the heating but not the cooling setpoint temperature. 
> When I manually increase the design cooling flow rate value in the 
> SYSTEM SIZING and ZONE SIZING objects, all setpoint temperatures are 
> satisfied.
> 
> I am trying to understand why the "sizing" routine was limited to 
> meeting only the heating setpoint temperature. Please provide help 
> when you have a chance.
> 
> Thank you for your valuable time.
> 
> Merid
> 
> 
> 
> 
> 
> 
> 
> 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
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 


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





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