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Re: [EnergyPlus_Support] Cooling coil connected to radiant cooling slab
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
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