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Re: [EnergyPlus_Support] Re: modelling night sky cooling
This thread has taken some turns and I'm not sure if everything has been
answered - sorry if I'm duplicating.
1. Answered elsewhere by Linda.
2. EnergyPlus only models the case of a heat exchanger embedded in the pond..
Increasing the quantity of tubing and decreasing its thermal resistance (thin
with high conductivity) should approach the direct fluid case.
3.1 Yes. I assume you've looked at the pond example file?
PondHeatExchanger.idf
3.2 Yes.
4. Not exactly. The pond will not be simulated if it is not connected to a
plant or condenser loop, so it must be part of a larger model. I have not
tried this, but I think you could start with the example file
PlantLoadProfile.idf, add the pond, schedule all of the pumps off, and see the
pond temperatures.
Mike
On 18 Feb 2008 at 6:28, bish.dj61 wrote:
> Hi All
> I have been poring over the Ground Heat Exchanger:Pond engineering
> ref, input/output ref, and example providedy with E+, so far with
> fairly little progress. All I want to do is compare the use of a
> cooling tower supplying a heat exchanger with the use of a pond:I
> have some questions:
>
> 1) Does the sky temp come with a standard weather file?
> 2) Does the pond heat exchanger have to act as a heat exchanger, or
> can water be pumped out of it into a heat exchanger, then returned?
> 3) I'm trying to get my head around how everything fits together,
> so :
> 3.1) Do all the components of the system exist on a "Plant Loop"
> 3.2) Are they all connected through "branches" and "nodes"?
> 4) Is it possible to run it standalone to simplify it so that I can
> just see what temperature the pond reaches overnight?
>
> cheers
> Danny
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "mapascualb"
> <mapascual@...> wrote:
> >
> > I have got a few questions about night sky cooling:
> >
> > - Can we use GROUND HEAT EXCHANGER:Surface ? Does this model use
> sky
> > temperature? We don't want to use the "pond" model because our
> > surface will be dry.
> >
> > - How is determined the sky temperature in the design day? Can we
> > control it? I could't find it in the engineering manual.
> >
> > - Are the sky tempeatures included in the weather file realistic? I
> > was expecting night summer sky temperatures below -20ºC for clear
> days
> > and the temperatures I have seen are above 0ºC. What is the usual
> > range of sky temperatures for a summer night in mid lattitud place?
> > (I am sorry for the off-topic).
> >
> >
> > Thanks.
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> > <mjwitte@> wrote:
> > >
> > > GROUND HEAT EXCHANGER:POND may be used to model this effect. See
> > descriptions
> > > in Input Output Reference and Engineering Reference, and example
> > file
> > > PondHeatExchanger.idf.
> > >
> > > Mike
> > >
> > >
> > > On 8 Feb 2008 at 7:20, bish.dj61 wrote:
> > >
> > > > hi All
> > > > Has anyone ever done, or have any idea on how to do night sky
> > cooling
> > > > modelling using the radiant temperature of the night sky to
> cool
> > water?
> > > > Any instruction or help would be greatly appreciated.
> > > > cheers
> > > > Danny
> > > >
> > > >
> > > >
> > > > 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.pdf
> > under the
> > > > Documentation link and press the "search" button.
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > > ========================================================
> > > Michael J. Witte, GARD Analytics, Inc.
> > > EnergyPlus Testing and Support
> > > EnergyPlus-Support@
> > >
> >
>
>
>
>
> 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.pdf under the
> Documentation link and press the "search" button.
>
> Yahoo! Groups Links
>
>
>
>
========================================================
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.
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