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[EnergyPlus_Support] Thank you Mike!
Hi Mike,
Thank you again! I think I will solve this problem with your golden
suggestion!
Best Regards!
Well Kong
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
<mjwitte@...> wrote:
>
> 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
> > > >
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> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > > ========================================================
> > > 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@...
>
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