[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[EnergyPlus_Support] Re: Vertical Ground Heat Exchanger


Yes, I found bypass pipes in E+ example. I understand now. It so hard
to study this examples due to the large amount of data in them.

Thank you very much.

Urban

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Edwin Lee <leeed2001@...> wrote:
>
> We don't mean internal bypasses inside the GLHE or GSHP models, but actual
> bypass pipes inside your EnergyPlus model.  Between any mixer and splitter
> in a plant loop, you are likely to find a bypass pipe in any of the E+
> example files.
> 
> Edwin
> 
> On Mon, Jan 10, 2011 at 08:20, urbantomc <urbantomc@...> wrote:
> 
> >
> >
> >
> >
> > Brent and Edwin thank you very much for assistence.
> >
> > It seems logical that bypass is used in the case of GLHE. But why is
> > there no description of bypass usage then? Neither in the EPlus
> > manual,nor in Murugappan's thesis on implementation of GSHP and GLHE
> > models in EPlus environment.
> >
> > Urban
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx<EnergyPlus_Support%40yahoogroups.com>,
> > Edwin Lee <leeed2001@> wrote:
> > >
> > > Urban:
> > >
> > > 1. Check all the node mass flow rates around the loop on both demand and
> > > supply sides. You should be able to see an overall mass balance in the
> > > system and that will help identify where the rest of the flow is going
> > > (likely down a bypass pipe as Brent stated).
> > >
> > > Edwin
> > >
> > > On Tue, Jan 4, 2011 at 18:02, Griffith, Brent <brent.griffith@>wrote:
> >
> > >
> > > >
> > > >
> > > > 1. I'd guess there is one or more bypass pipes that get some of the
> > > > flow and explain why they aren't the same.
> > > >
> > > > 2. That heat transfer is driven by the operation of the plant
> > > > equipment inside the building and that has not changed with a different
> > > > borehole field. You should see some significant differences in loop
> > > > operating temperatures, but not necessarily that heat transfer rate
> > because
> > > > nothing much has changed on the demand side of the loop.
> > > >
> > > >
> > > >
> > > > *From:* EnergyPlus_Support@xxxxxxxxxxxxxxx<EnergyPlus_Support%40yahoogroups.com>[mailto:
> > > > EnergyPlus_Support@xxxxxxxxxxxxxxx<EnergyPlus_Support%40yahoogroups.com>]
> > *On Behalf Of *urbantomc
> > > > *Sent:* Tuesday, January 04, 2011 3:35 PM
> > > > *To:* EnergyPlus_Support@xxxxxxxxxxxxxxx<EnergyPlus_Support%40yahoogroups.com>
> > > > *Subject:* [EnergyPlus_Support] Vertical Ground Heat Exchanger
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Hi everyone.
> > > >
> > > > I have some questions regarding vertical ground heat exchangers.
> > > >
> > > > 1. Why is the mass flow in the vertical GHE different from the water
> > > > mass flow at the source side of the heat pump? Shouldn't they be the
> > same?
> > > >
> > > > 2. When I've simulated vertical GHE with borehole configuration of 1×2
> > and
> > > > then of 4×4 (same depths) for the same building, the output parameter
> > > > 'VERTICAL GROUND HEAT EXCHANGER:Ground Heat Exchanger Heat
> > > > Transfer[W](Hourly)'
> > > > showed approximately the same values. Why is that so? Does that output
> > > > parameter mean the heat transfer of a single borehole?
> > > >
> > > > Any help would be really appreciated.
> > > >
> > > > Regards,
> > > >
> > > > Urban
> > > >
> > > >
> > > >
> > >
> >
> >  
> >
>




------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to 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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/