Re: [EnergyPlus_Support] Re: Modeling Active Chilled Beams

2013/2/18 Jean marais <jeannieboef@xxxxxxxxx>

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
> >>
> >>
> >
> >
>