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Re: [EnergyPlus_Support] Cooling coil connected to radiant cooling slab
I was wrong! EnergyPlus should be able to model the cooling coil in series
with a constant flow radiant slab (LOW TEMP RADIANT SYSTEM:CONSTANT FLOW), but
I must say that noboby has actually tried this.
Set up the air loop, cooling coil, and radiant slab as you normally would
except the water side. Put the cooling coil and the radiant slab on the same
branch in the chilled water loop. The cooling coil chilled water outlet node
name will be the same as the radiant slab cooling water inlet node name.
Mike
On 29 Nov 2006 at 13:21, Michael J. Witte wrote:
> Thank you for the extra details. EnergyPlus cannot model this configuration,
> but I am not sure it will make a huge difference. Because the radiant slab is
> being modeled as constant flow, I do not see how the overall energy use of the
> system will change if it takes chilled water directly from the chilled water
> supply or if the water is taken from the exit of the main cooling coil. The
> radiant slab must get the same amount of energy from the chilled water in
> order
> to control the space. My suggestion would be to model this with the radiant
> slab(s) and the main cooling coil(s) in parallel with each other.
>
> Mike
>
>
> On 22 Nov 2006 at 17:39, Zhen Tian wrote:
>
> > Hi, Mike,
> >
> > I am sorry I did not explain my plan very clearly. The chilled water
> from
> > chillers will first pass through main cooling coil. After leaving the
> cooling
> > coil, it will enter radiant slab, which is constant flow with its own
> > circulation pump. The cooling coil will determine the chilled water flow.
> > There should be a bypass pipe. When chilled water temperature out of
> cooling
> > coil is lower than the water temperature required by the constant flow low
> > temp radiant system, part of the chilled water out of cooling coil will be
> > bypassed.
> >
> > In reality, the chilled water is also connected to the radiant slab.
> The
> > water supplied to radiant slab is from three aspects 1) water out of
> cooling
> > coil, 2) chilled water from chillers, and 3) recirculated water from
> chilled
> > slab. When chilled water temperature out of cooling coil is higher than
> the
> > water temperature required by the constant flow low temp radiant cooling
> > system, the chilled wate from chiller will provide additional
> low-temperature
> > water and mix with the water from cooling coil.
> >
> > I think this configuration maybe too complicated to configure in
> > EnergyPlus, so I just ignore the chilled water flow from chiller directly
> to
> > the radiant slab cooling.
> >
> > Thank you very much.
> >
> > Regards,
> >
> > Zhen
> >
> > "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
> > I do not know how this could be done in EnergyPlus. The cooling
> coil
> > controller and the radiant slab controls will both want to set the chilled
> > water flow rate. If the coil and slab are in series then which controller
> will
> > set the flow? Perhaps you can explain the connections and control strategy
> in
> > more detail.
> >
> > Mike
> >
> > On 21 Nov 2006 at 22:40, Zhen Tian wrote:
> >
> > > Dear all,
> > >
> > > I am trying to make the radiant slab cooling system connecting to the
> air
> > > system main cooling coil in a E+ simulation model. The chilled water
> will
> > > pass the cooling coil first and then go to the radiant slab. As both
> > cooling
> > > coil and radiant slab will be in the cooling demand group, could someone
> > tell
> > > me how to arrange this configuration in EnergyPlus?
> > >
> > > Thank you very much.
> > >
> > > Regards,
> > >
> > > Zhen
> > >
> > >
> > > ---------------------------------
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> >
> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support
> > EnergyPlus-Support@xxxxxxxx
> >
> >
> >
> >
> >
> >
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>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
>
>
>
> 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
>
>
>
>
>
The primary EnergyPlus web site is found at:
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Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
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