Dear Deuk-Woo, Kim
Modeling an existing building has significant potential benefits because it highlights the differences between “predicted” energy and “actual” energy. The gap between the two is a starting point to understand why the difference exists and how to improve performance. The model is useful because many aspects of operation are hidden from even careful observation. If, for example, predicted heating energy is much less than the actual heating energy, you can begin a process of determining why the heating system uses more energy than expected.
Another possible use of existing building energy analysis is to optimize operation in real time. There is research being conducted in this area, which is called “Model Predictive Control”. You may find it interesting. (Google the topic).
The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of brainwt
Sent: Wednesday, January 18, 2012 8:19 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: The purpose of doing HVAC simulation
Thanks for your attention and kind reply, Neil
I'd like to discuss some more.
I think that your stance for the purpose of doing HVAC simulation would be economic reason and still in context of before-construction.
Could you tell me about your opinion about application on after-construction context?
I hope I am not intruding you.
Any comment would be appreciated.
Best regards
Deuk-Woo, Kim
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Neil Bulger <Neil.bulger@...> wrote:
>
> I would say that in part, energy modeling and EnergyPlus being 1 tool is
> used for this very reason, to perform parametric studies of "what could
> be". In a way, the whole basis of informed design is to build the best
> option and reduce the risk associated with it. For example, if we didn't
> use these tools, we could build 4 buildings, see which approach was the
> most energy efficient or produced the best daylighting or the happiest
> people. The winner would remain and all other 3 designs would be torn down.
> Unfortunately, developers do not like to spend their money on this trial
> and error approach.
>
> So again, in-part, energy modeling and the use of this tool arise from the
> desire to quantify and compare several unique ways of creating buildings
> with one another.
>
> I am enjoying this high level question. Thanks!
>
> Neil
>
> 2012/1/17 ê¹���À�ì�° <deukwookim@...>
>
> > **
> >
> >
> > Dear Karen, ****
> >
> > ** **
> >
> > Would you please explain some more, the comment on ��*Modeling the
> > mechanical systems can also serve all these purposes. You can compare
> > systems, choose the best equipment based on efficiency and performance
> > curves, evaluate controls strategies, etc.*��****
> >
> > ** **
> >
> > It means that the purpose of HVAC simulation is to find out ��best��
> > alternative (by parametric study)? am I right?****
> >
> > ** **
> >
> > Best Regards,
> > Deuk-Woo, Kim
> >
> > ****
> >
> > ** **
> >
> >
> >
>
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