Re: [EnergyPlus_Support] Re: Modeling Degradation of a VAV System Using EnergyPlus

[Philip Haves <phaves@xxxxxxx>]

Noel,

Can you be more specific about what you mean by:
- "drifiting controls"?
- "degradation of ... heating and cooling systems (efficiency)" - boiler 
efficiency, chiller effiency, fan efficiency ...?
- "damper control" - leakage?

We can't model these things without being specific about how they affect 
the performance of different items of equipment at different operating 
points, which usually means have a physical or mechanistic description 
of what is causing the degradation.  If we don't have this foundation, 
the results could be very misleading.

Phil

noelcrrl wrote:

> Philip,
>
> Thanks for your reply. I am trying to model the degradation of
> controls systems (drifting controls), heating and cooling systems
> (efficiency), and air distribution systems as a function (leakage,
> damper control, etc.) as a function of time.
>
> Regards,
> Noel
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> <mailto:EnergyPlus_Support%40yahoogroups.com>, Philip Haves <phaves@...>
> wrote:
> >
> > What sort of degradation would you like to model? Do you have
> specific
> > causal mechanisms in mind: leaking valves and dampers, drifting
> sensors ...?
> >
> > noelcrrl wrote:
> >
> > > Hi. I am trying to model a VAV HVAC system and study its
> performance
> > > as a function of time. In essence, I am trying to model the
> > > degradation of a HVAC system over time. I am aware that
> EnergyPlus is
> > > limited and in some ways not capable of simulating the
> degradation of
> > > an HVAC in terms of performance and efficiency. However, would
> it be
> > > possible to input a defined efficiency versus time curve into
> > > EnergyPlus that would represent the HVAC system efficiency as a
> > > function of time? If this is possible, what process should I
> follow
> > > to accomplish this? Also, is this the right approach or should I
> go
> > > about this another way? And finally, is there a resource that I
> could
> > > tap into that would have a number of efficiency versus time
> curves
> > > that could be helpful.
> > >
> > > Thanks in advance for your help!
> > >
> > >
> >
> >
> > --
> > *****************************************
> > Philip Haves
> > Leader, Commercial Building Systems Group
> > Lawrence Berkeley National Laboratory
> > 1 Cyclotron Road Bldg 90R3111
> > Berkeley, CA 94720-8134
> > Tel: (510) 486 6512
> > Fax: (510) 486 4089
> > *****************************************
> >
>
>  


-- 
Philip Haves
Leader, Commercial Building Systems Group
Lawrence Berkeley National Laboratory
1 Cyclotron Road Bldg 90R3111
Berkeley, CA 94720-8134
Tel: (510) 486 6512
Fax: (510) 486 4089






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

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/