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Re: [EnergyPlus_Support] Re: model "Dry cooler" and "run-around heat recovery" in EnergyPlus?
Energy plus does not have a closed loop cooling tower (dry cooler). One
is scheduled to be added in the near future. You can probably simulate
this by using a COOLING TOWER:SINGLE SPEED in series with a HEAT
EXCHANGER:HYDRONIC:FREE COOLING. See the IO and Engineering reference
for more details.
tjutw wrote:
>
> Hi Richard,
>
> I want to simulate two different units: heat recovery unit and dry
> cooler. You have helped me with the run-around heat recovery unit. So
> now I want to know how to simulate the dry cooler.
>
> Please see the following website:
> http://www.colmaccoil.com/afv.asp <http://www.colmaccoil.com/afv.asp>
> >From the web, dry cooler eliminates the cost due to the cooling
> towers. In my project, there are no cooling tower and compression
> chillers because of low cooling load. So the dry cooler is directly
> connected to the radiant cooling slab.
>
> Thanks,
>
> Tj Ywh
>
> PS: In actual system, there is a heat exchanger between the dry cooler
> and the radiant cooling slab. I think it should be not easy to
> simulate the heat exchanger. Then I just ignore it.
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> <RRaustad@...> wrote:
> >
> > I didn't quite understand what you meant by:
> > "A mixture of water and glycol is circulated through the coil and
> fed to
> > the units."
> >
> > I based my response on this statement:
> > "This system consists of a recovery coil in the exhaust air stream
> > connected to a preheat coil in the outside air stream. A pump
> circulates
> > a water and glycol solution between the two coils."
> >
> > So if you mean that half of the HX is in the exhaust air stream, the
> > other half of the HX is in the OA stream and a pump pushes fluid
> between
> > these halves, then all you need is the generic HX.
> >
> > If you mean something else, then please provide more information (or a
> > manufacturers web site).
> >
> > tjutw wrote:
> > >
> > > Hi Richard,
> > >
> > > Thanks a lot.
> > > I will model the runaround heat recovery unit by using
> > > "HeatExchanger:AirToAir:Generic model".
> > > What model should be used for the dry cooler?
> > >
> > > Thanks,
> > >
> > > Tj Ywh
> > >
> > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> > > <RRaustad@> wrote:
> > > >
> > > > Use the HeatExchanger:AirToAir:FlatPlate or
> > > > HeatExchanger:AirToAir:Generic models to simulate this type of heat
> > > > recovery unit. If the generic model is used, set the latent
> > > > effectiveness values to 0. Use the nominal electric power input to
> > > > simulate pump power.
> > > >
> > > > tjutw wrote:
> > > > >
> > > > > Hi all,
> > > > >
> > > > > I want to model the dry cooler and run-around closed loop heat
> > > > > recovery unit using EnergyPlus. The following are simple
> descriptions
> > > > > about the two units.
> > > > >
> > > > > Dry cooler is a free-standing cooler coil over which outside
> air is
> > > > > blown by a fan. A mixture of water and glycol is circulated
> through
> > > > > the coil and fed to the units. In this system, there are no
> cooling
> > > > > tower and compressor chillers.
> > > > >
> > > > > This system consists of a recovery coil in the exhaust air stream
> > > > > connected to a preheat coil in the outside air stream. A pump
> > > > > circulates a water and glycol solution between the two coils.
> > > > >
> > > > > Would you please give me some advice how to simulate them?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Tj Ywh
> > > > >
> > > > >
> > > >
> > > > --
> > > > Richard A. Raustad
> > > > Senior Research Engineer
> > > > Florida Solar Energy Center
> > > > University of Central Florida
> > > > 1679 Clearlake Road
> > > > Cocoa, FL 32922-5703
> > > > Phone: (321) 638-1454
> > > > Fax: (321) 638-1439 or 1010
> > > > Visit our web site at: http://www.fsec.ucf.edu
> <http://www.fsec.ucf.edu>
> <http://www.fsec.ucf.edu <http://www.fsec.ucf.edu>>
> > > >
> > > > UCF - From Promise to Prominence: Celebrating 40 Years
> > > >
> > >
> > >
> >
> > --
> > Richard A. Raustad
> > Senior Research Engineer
> > Florida Solar Energy Center
> > University of Central Florida
> > 1679 Clearlake Road
> > Cocoa, FL 32922-5703
> > Phone: (321) 638-1454
> > Fax: (321) 638-1439 or 1010
> > Visit our web site at: http://www.fsec.ucf.edu <http://www.fsec.ucf.edu>
> >
> > UCF - From Promise to Prominence: Celebrating 40 Years
> >
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
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