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[EnergyPlus_Support] Re: Boiler Sizing
Dear Richard,
I'm missing something....
Load is 910kW.
Boiler 1 nominal capacity is 205kW
Boiler 2 nominal capacity is 205kW
ONLY Boiler 1 runs (and meets the load, too! which means it satisfies
a load that is over 400% of its capacity)
p.s., Thanks for your patient and regular assistance.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad
<RRaustad@...> wrote:
>
> The nominal capacity sets the upper limit (PLR=1).
>
> Example: Load Range 1 is set at 190 kW and controls only Boiler 1 and
> Load Range 2 is set at 9999999999W and controls both boilers.
> For loads below 190 kW only boiler 1 can operate. This allows you to
> pick with equipment will operate in that load range.
> For loads up to 205 kW both boilers can operate but only boiler 1 is
needed.
> For loads above 205 kW, both boilers will operate with boiler 2
> operating at part-load up to it's full capacity at a total load of
410 kW.
>
> JV Dirkes II wrote:
> >
> > Fair enough. So what does the "nominal capacity" in the Boiler
object do?
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> > <RRaustad@> wrote:
> > >
> > > If the load is 910 kW, then the Load Range needs to account for
that.
> > > The load range does not set the equipment size, it determines which
> > > equipment operates. I'm surprised you didn't see an error in the err
> > file.
> > >
> > > JV Dirkes II wrote:
> > > >
> > > > Dear E+ Forum,
> > > >
> > > > I've just run a model for which I specified the Boiler:Simple
"Nominal
> > > > capacity" for two boilers as 205kW each, The HEATING LOAD
RANGE BASED
> > > > OPERATION is set up so that the upper limit of Load Range 1
was 190kW,
> > > > and the upper limit of Load Range 2 was 380kW.
> > > > For this run, E+ calculates the heating load as 910kW. This
strikes
> > > > me as odd; it seems that the boiler capacity should be limited
to no
> > > > more than 410kW or perhaps 380kW.
> > > >
> > > > Another aspect of this problem is that Pump #2 never operates.
I have
> > > > two branches, each of which has a pump and boiler. The Pump#2 +
> > > > boiler#2 branch never operates, even though it's schedule is
always
> > > > "on". (.svg file shows everything connected as I expect.)
> > > >
> > > > Any suggestions regarding what might cause these problems?
Thanks in
> > > > advance.
> > > >
> > > >
> > >
> > > --
> > > 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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