[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [EnergyPlus_Support] other questions about plant-loop and condenser -loop.
1. It is difficult to say what may be wrong without seeing this input file.
Perhaps the 5ZoneBranchSupplyPumps.idf example file will help you. I notice
that in this example there is no bypass on the chilled water supply side. Try
removing the supply bypass and see if this solves the problem.
2. Try using a variable speed condenser water pump with a linear part-load
performance and intermittent controls. The condenser water flow request from
the chillers should set the condenser loop flow rate and the pump should follow
it. So the pumping eneryg should be the same as if there were two different
pumps turning on and off.
Mike
On 27 Sep 2006 at 5:12, well_kong wrote:
> Hi Mike,
>
> Thank you very much!you are so kind!
>
> 1.I want to see the optimum control of plant loop.so i set 2 branches
> with branch-pumps.and i set the bypass branches both in supply side
> and demand side.but there are always warnings:
>
> ** Warning ** Error -- Mass Flow Rate Calculation in Plant Loop=HW-1-
> LOOP, Outlet and Inlet differ by more than tolerance.
> ** ~~~ ** Occurrence info=WINTER-DESIGN-DAY, 01/21 08:00 -
> 09:00
> ** ~~~ ** Loop inlet node=HW-1-SS-IN-PIPE-IN-ND,
> flowrate=8.0905 m/s
> ** ~~~ ** Loop outlet node=HW-1-SS-OUT-PIPE-OUT-ND,
> flowrate=16.1811 m/s
>
> What should i do?
>
> 2.it's not convenient for condenser-loop only could be set a circle-
> pump per loop.so for two chillers,one condenser-pump is not
> physical,and just one pump is not energy-save.
> how to solve that problem? set two condenser-loops for different
> chillers?
>
>
>
> Well Kong
>
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> <mjwitte@...> wrote:
> >
> > It is difficult to say for sure without seeing the input file.
> This type of
> > error usually occurs when the loop is unable to conserve mass flow
> around the
> > loop. Check the flow rates specified for the cooling tower(s) and
> the
> > condenser loop pump and in the condenser loop object. Check if
> there is a
> > bypass. Check the pump controls. Check the ACTIVE/PASSIVE
> settings on the
> > branches. See ExampleFiles\CoolingTower.idf for an example.
> >
> > Mike
> >
> >
> > On 25 Sep 2006 at 5:25, well_kong wrote:
> >
> > > I simulated whole IDF file.and it's warning so many times!
> > > I really can't resolve it.
> > > Why the minimum mass flow is greater than the maximum?
> > >
> > > ** Warning ** COOLING TOWER:SINGLE SPEED- "CT-SS-TOWER-1":
> > > ** ~~~ ** Condenser Minimum Loop Mass Flow is greater
> than
> > > Condenser Maximum Loop Mass Flow
> > > ** ~~~ ** Minimum Loop Mass Flow has been reset to
> Maximum Loop
> > > Mass Flow
> > >
> > >
> > >
> > >
> > >
> > >
> > > 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
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> > ========================================================
> > 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.idf 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.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf 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:
mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
mailto: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/