Re: [EnergyPlus_Support] Heating coil model in EP

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

> I think that 
> the value for the Water Flow of coil in the EP model, that we 
> defined, is just some limit for calculation. 

That is correct.  In COIL:Water:SimpleHeating, "Max Water Flow Rate of Coil" is 
a limit.  If the load requested of the coil is met at a flow rate which is less 
than this flow rate, then changing on the max flow rate will not change any 
results.  If the coil flow is not large enough to meet the load, then the 
results would change with a change in max flow rate.

Mike



On 10 May 2006 at 10:54, natasamdj wrote:

> Dear, 
> I have a few questions about Heating coil model in Energy Plus. I 
> would like to make some optimization in GenOpt. I have been using 
> GenOpt for three years. Currently I think that there is no any 
> problem for me. Now, I am using Energy Plus version 123. I coupled 
> these two, except that I had to add the old Bat file that you sent 
> long ago. However I think that it works fine.
> 
> Now my questions are more considering the model for Water Heating 
> Coil. I found out that if I posted the optimization problem where 
> the optimization variable is Water Volumetric Flow Rate of Coil 
> (which defined the Coil in EP), and the objective function is Water 
> Flow as Output from EP (the full name is: MAIN HEATING COIL WATER 
> INLET NODE,System Node VolFlowRate[m3/s]), then there is no any 
> changes in the objective function, actually it is constant all the 
> time of the optimization. And of course, the optimization is 
> completed successfully after three steps.
> 
> I just wonder if I see the problem well, that I cannot change the 
> water flow of the coil by changing it in the template file, or in 
> the setting of the model in EP. If it is correct, then it is 
> possible just to change the flow by changing the inlet water 
> temperature of the coil and the UA value of the coil. I think that 
> the value for the Water Flow of coil in the EP model, that we 
> defined, is just some limit for calculation. 
>  
> The name of the file that I uploaded on 
> http://groups.yahoo.com/group/EnergyPlus_Support/files/ 
> is "Information flow diagram for COIL.doc". It is *.doc file, 
> beacuse I just wonder if I see the heating coil model well and if my 
> assumption is right.
> So, if it is correct, then I can post the optimization problem just 
> with the UA value and inlet water temperature of the coil as the 
> optimziation variables. After, I can get as an output the water flow 
> of the coil, and use that value in the result post processing. In 
> this way I will have easier optimization problem for GenOpt.
> 
> P.S. Sorry if my explanation is too long, and unclear, but I hope 
> that you can help me, or that we can make some improvements for 
> eachother benifitfs
> 
> Thank in advance
> 
> Natasa M.Djuric 
> 
> 
> 
> 
> 
> 
> 
> 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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