[EnergyPlus_Support] Re: Modeling Active Chilled Beams

["Jean marais" <jeannieboef@xxxxxxxxx>]

Yes, that scheme sounds like what I would expect. If the scheme looks the same as that in the example file, then you should submit it to the helpdesk if it is not working to find out why. You may learn something valuable that you could then share with us here.
good luck,
Jean.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Wenting Ding <dingwenting@...> wrote:
>
> Jean,
> 
> I set the Plate Heat Exchanger as one of demand branches of the primary
> chilled water loop and the other side of the PHE as plant for another
> chilled water loop(I called it secondary chilled water loop), in the
> secondary chilled water loop the radiant floor system is set as demand
> branch. Do you think the scheme is right?
> However it didn't work.
> 
> The example file worked properly.
> 
> Wendy
> 
> 
> 2013/2/18 Jean marais <jeannieboef@...>
> 
> > **
> >
> >
> > for heating the object would be waterheater:mixed.
> >
> > I'm sceptical that he plate water-water object is not working...in my
> > experience all objects in energyplus work as intended, but as I've not used
> > it, I cannot verify. Have you tried the example in the example file
> > associated with this object?
> >
> > Using waterheater:mixed and storage:chilledwater:mixed objects came about
> > before the new objects were available. Since there now exist new dedicated
> > objects for these purposes, I would try and use them. I suspect, however
> > that the node connection scheme will be identical to the "old" methods with
> > the tank objects here mentioned.
> >
> > Jean
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Wenting Ding wrote:
> > >
> > > Hi, Jean,
> > > I also want to use Plate heat exchange to model radiant floor system, but
> > > it doesn't work properly. I don't know why. I want to try the method you
> > > mentioned. For chilled water, I can use thermal storage:chilled
> > > water:mixed, For hot water, which object should I use?
> > > Could you give me some advice? Thank you.
> > >
> > >
> > > 2013/2/12 Jean Marais
> > >
> > > > **
> >
> > > >
> > > >
> > > > 1) "This loop architecture is not possible within energy
> > plus."-correct.
> > > > As far as I am aware only one componant per branch is allowed. Are
> > there
> > > > exceptions? I think a pump object possibly.
> > > > 2) Thermodinamically, the energy used by the users (AHU cooling coil
> > and
> > > > chilled beam) will equate to the same amount. However, you'll need to
> > > > supply them seperately. I suggest using one demand side branch to
> > supply
> > > > the AHU with say 6 degC chilled water and another demand side branch to
> > > > supply a ThermalStorage:ChilledWater:Mixed object. This
> > > > ThermalStorage:ChilledWater:Mixed object becomes the "chiller" in your
> > > > second plant system which can now supply your chilled beam objects with
> > > > chilled water at temperatures of say 18 deg C.
> > > > 3) #2 is not the only solution...I believe the newest versions of e+
> > also
> > > > use plate water-water heatexchanger objects now.
> > > > If you need more help please see earlier posts from Marko Ignjatovic
> > who
> > > > posted earlier in the forum. He's grasped the logic of this kind of
> > > > solution well (all be it for the hot water scenario).
> > > > regards,
> > > > Jean.
> > > >
> > > >
> > > > On 30 January 2013 01:50, k0bes88 wrote:
> > > >
> > > >> **
> >
> > > >>
> > > >>
> > > >> Hi there,
> > > >>
> > > >> I'm trying to model an office tower that is conditioned by active
> > chilled
> > > >> beams. I am having an issue with the sequencing of systems on the
> > Chilled
> > > >> Water Loop Demand Side. The intent is for the chilled water to serve
> > the
> > > >> Air Handling Units first. The water on the secondary return mixes
> > together
> > > >> after the AHUs, then serves the chilled beams at a higher temperature
> > > >> before returning to the chillers.
> > > >>
> > > >> It appears this loop architecture is not possible within energy plus.
> > > >>
> > > >> Do you have a recommended method for modelling chilled beams, given
> > they
> > > >> cannot be modeled in parallel or series on the secondary demand loop?
> > > >>
> > > >> Any assistance or work-arounds would be greatly appreciated!
> > > >>
> > > >> Thanks,
> > > >> Alex
> > > >>
> > > >>
> > > >
> > > >
> > >
> >
> >  
> >
>




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