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[EnergyPlus_Support] Re: need help w/ monthly gas usage results
Dear Dimos,
Here's my opinion:
1) Boiler:Steam sounds like a good choice. In my experience, the part
load ratio coefficients make a big difference, so I encourage you to
take some time to get realistic values of these coefficients for the
boiler.
2) The Gas Equipment object looks suitable for an oven. Assuming that
this is an oven type that is used for drying products or curing paint,
the radiant fraction will be 0, the latent fraction will be 0, and the
fraction lost will be about .20 - .25. A bakery oven will use similar
fractions. You will have to determine the schedule of operation and
load.
3) Finally, ovens often have a fan for the burner, another for exhaust
and sometimes a fan for circulation; the energy for these fans should
be included in your model.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, D T <ellinas.1984@...> wrote:
>
> Thanks for the suggestion. Since I have never modeled boilers nor
ovens in EnergyPlus, could you perhaps steer me toward the objects I
would need to work with. I know that for boilers there are several
objects. The plant I am modeling uses boilers for steam generation, so
would I need to use the steam boiler option? Also, for the ovens, what
object do you suggest I work with?
>
> Assuming I get these to work properly after modeling them, how would
I get them to report in the ABUPS report?
>
> Thanks in advance for helping me with this.
>
> Dimos
>
>
>
> --- On Thu, 7/31/08, JV Dirkes II <jvd2pe@...> wrote:
>
> From: JV Dirkes II <jvd2pe@...>
> Subject: [EnergyPlus_Support] Re: need help w/ monthly gas usage results
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Date: Thursday, July 31, 2008, 8:08 PM
>
>
>
>
>
>
> Dear Dimos,
>
> The Boiler and ovens will operate on different schedules with
> different loads and will have different part load efficiencies.
> Therefore, I think you should model them separately, not as a combined
> object.
>
> I have not modeled ovens before in E+, but I have applied them in
> buildings. A typical oven will lose heat to the zone it occupies
> through the oven walls, so you'll need to know the insulation value of
> those walls and calculate that rate. The rate will vary as the oven
> warms up and cools down, so you will need to know the operating
schedule.
>
> An oven also loses heat through the stack. That is the amount which
> should be assigned to the "Fraction Lost" field.
>
> --- In EnergyPlus_Support@ yahoogroups. com, D T <ellinas.1984@ ...>
wrote:
> >
> > Thanks for the help. I now understand why I'm not getting values.
> However, my ultimate goal is to obtain monthly gas usage values for
> one boiler and 4 ovens for the facility I am modeling. Since I'm
> trying to model a boiler and 4 ovens, could I just simply specify the
> total power input from the boiler and ovens (in watts) under the GAS
> EQUIPMENT object? When I did that, I got an error in my simulation. Or
> do I need to use the boiler object and something else for the ovens?
> I'm still struggling with trying to get gas usage values for this part
> of my work. Any help or suggestions would be appreciated.
> >
> > Thank you,
> > Dimos
> >
> > --- On Mon, 7/28/08, JV Dirkes II <jvd2pe@> wrote:
> >
> > From: JV Dirkes II <jvd2pe@>
> > Subject: [EnergyPlus_ Support] Re: need help w/ monthly gas usage
results
> > To: EnergyPlus_Support@ yahoogroups. com
> > Date: Monday, July 28, 2008, 12:48 PM
> >
> >
> >
> >
> >
> >
> > Dear Dimos,
> >
> > I took a look at your file and I think your problem is this:
> >
> > 1) You have an ELECTRIC heating coil in the furnace.
> > 2) Since the Furnace is the only heating object, and its coil uses
> > electricity, there is no load for the Boiler:Steam.
> > 3) Therefore, there is no gas consumption.
> >
> > --- In EnergyPlus_Support@ yahoogroups. com, "ellinas.1984"
> > <ellinas.1984@ ...> wrote:
> > >
> > > Hello group,
> > > The facility I am modeling has two boilers. I specified one of them
> > > under the boiler object in EnergyPlus just to see how it would
run. I
> > > also specified the gas rate schedule. However, when I run the
> > > simulation and view the results, I get values of zero for the
monthly
> > > gas usages. Unlike the results from the electricity rate schedule
> that
> > > I specified, where it shows the monthly usage in the results, I get
> > > nothing for the gas. Is there anyone out there that knows how to
help
> > > me solve this problem?
> > >
> > > Thank you,
> > > Dimos
> > >
> > > p.s. I uploaded my idf file. It is bakery3.idf with the subtitle
"gas
> > > rate usage values" under the problem submittal folder.
> > >
> >
>
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