[EnergyPlus_Support] Coil model in Energy Plus

["natasamdj" <natasamdj@xxxxxxxxxxx>]

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 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 can not 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, that 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. 

Sorry, because of so long introduction. I just want to ask, if all 
theses above is correct, that I can posted the optimization problem 
just with the UA value and inlet water temperature of the coil. 
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.

Thank in advance

Natasa M.Djuric 








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