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Re: [EnergyPlus_Support] Re: Water Heater Question
Sorry about the delay in responding to these.
>From one of the plant experts . . . ". . .as far as the water heater goes, it
can probably be on either demand or supply side, since it's completely passive.
But there has to be some component on the demand side that will ask/demand for
flow, otherwise there will be no flow in the loop. The water heater will never
ask for flow."
So, regarding the initial inquiry, what you describe should be possible. Are
you getting flow in the system? If not, that needs to be resolved first. The
DHW object should be on the demand side of its loop and should force flow in
that loop (there must be a pump in that loop as well - is there?). If this
doesn't help you figure it out, please upload the file.
Mike
On 14 Jun 2006 at 17:46, Elmer Morrissey wrote:
> Hello all,
>
> I also have an aside question related to the water heater. If the
> boiler is supplying hot water to the unit and it is connected to
> the 'source side', does the water heater's source connections have
> to be on the supply side that water loop?
>
> I have noticed this is various examples of the water heater's use.
> Thanks again, I appreciate any input.
>
> Kind regards
>
> -Elmer
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Elmer Morrissey"
> <elmofuddly@...> wrote:
> >
> > Hello all,
> >
> > Is it possible to link a water heater with a boiler cicuit (which
> is
> > additionally heated via an electric internal unit) and then
> schedule
> > the use as seen below...
> >
> > WATER HEATER:MIXED,
> > J5, !- Name
> > 0.5, !- Tank Volume {m3}
> > Hsched:1, !- Setpoint Temperature Schedule
> > , !- Deadband Temperature Difference
> > {deltaC}
> > 80, !- Maximum Temperature Limit {C}
> > CYCLE, !- Heater Control Type
> > 5000, !- Heater Maximum Capacity {W}
> > 0, !- Heater Minimum Capacity {W}
> > , !- Heater Ignition Minimum Flow Rate
> > {m3/s}
> > , !- Heater Ignition Delay {s}
> > Electricity, !- Heater Fuel Type
> > 1, !- Heater Thermal Efficiency
> > , !- Part Load Factor Curve
> > 0, !- Off-Cycle Parasitic Fuel
> Consumption
> > Rate {W}
> > Electricity, !- Off-Cycle Parasitic Fuel Type
> > 0, !- Off-Cycle Parasitic Heat Fraction
> To
> > Tank
> > 0, !- On-Cycle Parasitic Fuel
> Consumption
> > Rate {W}
> > Electricity, !- On-Cycle Parasitic Fuel Type
> > 0, !- On-Cycle Parasitic Heat Fraction
> To
> > Tank
> > SCHEDULE, !- Ambient Temperature Indicator
> > Hsched:2, !- Ambient Temperature Schedule
> > , !- Ambient Temperature Zone
> > 0, !- Off-Cycle Loss Coefficient To
> > Ambient Temperature {W/K}
> > , !- Off-Cycle Loss Fraction To Zone
> > 0, !- On-Cycle Loss Coefficient To
> Ambient
> > Temperature {W/K}
> > , !- On-Cycle Loss Fraction To Zone
> > 1.111111E-06, !- Peak Volumetric Use Flow Rate
> {m3/s}
> > HWSschdule:J5, !- Use Flow Rate Fraction Schedule
> > Hsched:3, !- Cold Water Supply Temperature
> > Schedule
> > , !- Use Side Inlet Node
> > , !- Use Side Outlet Node
> > 1.0, !- Use Side Effectiveness
> > J5:Pin, !- Source Side Inlet Node
> > J5:Pout, !- Source Side Outlet Node
> > 1.0; !- Source Side Effectiveness
> >
> > I am having problems with my configuration. I tried using a DHW
> unit
> > on the use side however I still recieve zero loads. Can anyone see
> > something that I may be missing?
> >
> > Kind regards
> >
> > -Elmer
> >
>
>
>
>
>
>
>
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>
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>
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>
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>
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>
>
>
>
>
>
>
>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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