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Re: [EnergyPlus_Support] No Design Heating Load
To elaborate further. The goal of the zone sizing calculation is to determine
the design supply air flow rate required by the zone to meet the load in the
zone. For an interior zone, it can be valid that there will be no design
heating load, but that zone should show a cooling load and the air flow rate
should be calculated according to that. Of course, a user-specified flow rate
will always override. The outside air load becomes a factor when the coils in
the air handling system are sized (SYSTEM SIZING).
Mike
On 21 Sep 2006 at 14:37, fred buhl wrote:
>
>
> asheaffe wrote:
>
> >I am running a simulation where I have a compact vav system with hot
> >water reheat. I keep getting errors saying that I have no heating
> >load for my interior zones, which makes me think that the outside air
> >controls that I have on the system are not set up right. I have set
> >up outside air flow/person on the zone level for all zones in the
> >building. I was under the impression that the program uses these
> >flows and max occupancy rates to determine the minimum outside
> >airflow for each zone. Is this true?
> >
> >
> Yes; but zone design heating loads don't include outside air. As long as
> the user des air flow rates
> are what you input, you are OK.
>
> Fred Buhl
>
> >The exterior zones are not returing this error (Zone 1S is an example
> >shown below), only the interior ones are (Zone 1SCore is an example
> >shown below). Anyone see a reason why I am getting zero heating load
> >when I assume that the outside air flow/person is passed to the
> >system level in the sizing routine?
> >
> >Also, on the eio output, it says that the calc des air flow rate for
> >these zones is zero, while the user des air flow rates are identical
> >to the ones I entered.
> >
> >Thanks,
> >
> >Andrew
> >
> > ** Warning ** Calculated design heating load for zone=1SCORE is
> >zero.
> > ** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC
> >inputs.
> > ** Warning ** Calculated design heating load for zone=1NCORE is
> >zero.
> > ** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC
> >inputs.
> > ** Warning ** Calculated design heating load for zone=2SCORE is
> >zero.
> > ** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC
> >inputs.
> > ** Warning ** Calculated design heating load for zone=2NCORE is
> >zero.
> > ** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC
> >inputs.
> > ** Warning ** Calculated design heating load for zone=3SCORE is
> >zero.
> > ** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC
> >inputs.
> > ** Warning ** Calculated design heating load for zone=3NCORE is
> >zero.
> > ** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC
> >inputs.
> > ** Warning ** Calculated design heating load for zone=4SCORE is
> >zero.
> > ** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC
> >inputs.
> > ** Warning ** Calculated design heating load for zone=5NCORE is
> >zero.
> > ** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC
> >inputs.
> > ** Warning ** Calculated design heating load for zone=4NCORE is
> >zero.
> > ** ~~~ ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC
> >inputs.
> >
> >
> >
> >!- =========== ALL OBJECTS IN CLASS: COMPACT HVAC:ZONE:VAV
> >===========
> > COMPACT HVAC:ZONE:VAV,
> > 1S, !- Zone Name
> > VAV Sys Pat 1, !- Air Handling System Name
> > All Zones, !- Thermostat Name
> > autosize, !- Zone Supply Air Max Flow Rate {m3/s}
> > 0.3, !- Zone Supply Air Min Flow Fraction
> > flow/person, !- Zone Outside Air Flow Type
> > 1.18000014980471E-02, !- Zone Outside Air Flow Rate {m3/s}
> > Hot Water, !- Reheat Coil Type
> > On, !- Reheat Coil Availability Schedule
> > Reverse Action, !- Zone Damper Heating Action
> > , !- Zone Supply Plenum Name
> > ; !- Zone Return Plenum Name
> >
> >COMPACT HVAC:ZONE:VAV,
> > 1SCore, !- Zone Name
> > VAV Sys Office, !- Air Handling System Name
> > All Zones, !- Thermostat Name
> > autosize, !- Zone Supply Air Max Flow Rate {m3/s}
> > 0.3, !- Zone Supply Air Min Flow Fraction
> > flow/person, !- Zone Outside Air Flow Type
> > 0.008024001018672, !- Zone Outside Air Flow Rate {m3/s}
> > Hot Water, !- Reheat Coil Type
> > On, !- Reheat Coil Availability Schedule
> > Reverse Action, !- Zone Damper Heating Action
> > , !- Zone Supply Plenum Name
> > ; !- Zone Return Plenum Name
> >
> >
> >
> >
> >
> >
> > =========== ALL OBJECTS IN CLASS: COMPACT HVAC:SYSTEM:VAV
> >===========
> >
> >COMPACT HVAC:SYSTEM:VAV,
> > VAV Sys Pat 1, !- Air Handling System Name
> > On, !- System Availability Schedule
> > autosize, !- Supply Fan Max Flow Rate {m3/s}
> > autosize, !- Supply Fan Min Flow Rate {m3/s}
> > 0.7, !- Supply Fan Total Efficiency
> > 600, !- Supply Fan Delta Pressure {Pa}
> > 0.9, !- Supply Fan Motor Efficiency
> > 1, !- Supply Fan Motor in Air Stream
> >Fraction
> > Chilled Water, !- Cooling Coil Type
> > , !- Cooling Coil Availability Schedule
> > , !- Cooling Coil Setpoint Schedule
> > 13.1, !- Cooling Coil Design Setpoint {C}
> > Hot Water, !- Heating Coil Type
> > , !- Heating Coil Availability Schedule
> > , !- Heating Coil Setpoint Schedule
> > 13, !- Heating Coil Design Setpoint {C}
> > 0.8, !- Gas Heating Coil Efficiency
> > , !- Gas Heating Coil Parasitic Electric
> >Load {W}
> > None, !- Preheat Coil Type
> > , !- Preheat Coil Availability Schedule
> > , !- Preheat Coil Setpoint Schedule
> > , !- Preheat Coil Design Setpoint {C}
> > 0.8, !- Gas Preheat Coil Efficiency
> > , !- Gas Preheat Coil Parasitic Electric
> >Load {W}
> > autosize, !- Maximum Outside Air Flow Rate {m3/s}
> > autosize, !- Minimum Outside Air Flow Rate {m3/s}
> > FIXED MINIMUM, !- Minimum Outside Air Control Type
> > , !- Minimum Outside Air Schedule Name
> > Return air temperature, !- Economizer Type
> > NO LOCKOUT, !- Economizer Lockout
> > 19, !- Economizer Upper Temperature Limit {C}
> > 4, !- Economizer Lower Temperature Limit {C}
> > , !- Economizer Upper Enthalpy Limit {J/kg}
> > , !- Supply Plenum Name
> > , !- Return Plenum Name
> > Draw Through, !- Supply Fan Placement
> > , !- Supply Fan Part-Load Power
> >Coefficients
> > Cycle On Any, !- Night Cycle Control
> > , !- Night Cycle Control Zone Name
> > , !- Heat Recovery Type
> > , !- Sensible Heat Recovery Effectiveness
> > , !- Latent Heat Recovery Effectiveness
> > None, !- Cooling Coil Setpoint Reset Type
> > None; !- Heating Coil Setpoint Reset Type
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >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
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> 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
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