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[EnergyPlus_Support] Re: Control Type Schedules
Mike,
You mentioned the controls in the example are complicated. Is there
an easier way to control the system?
Michelle
--- In EnergyPlus_Support@y..., "Michael J. Witte" <mjwitte@g...>
wrote:
> See responses mixed in below.
>
> On 28 Aug 2002, at 15:38, belleengr wrote:
>
> > Mike,
> >
> > Thanks for the location of control types in the reference.
> >
> > I used the Examples\AutoSize\5ZoneAutoDXVAV.idf as my starting
> > point. As far as I can tell my new file and the original example
> > file are identical with respect to the zone controls and the
system
> > controls. I did change some of the setpoints. Something else
that is
> > a bit curious, and makes me think the controls are not working
> > properly, is the main heating coil is scheduled OFF during he
> > summer, however it is providing heating when the cooling coil
> > discharge is low.
>
> I think there's a mistake in the schedule for the main heating
coil,
> it should be HeatingCoilAvailSched, but it's set to
> ReheatCoilAvailSched. However, if the setpoints are correct, it
> should not run anyway.
>
> >
> > I am in the midst of reviewing all my setpoints to make sure I
don't
> > have a decimal misplaced or something silly.
> >
> > I will also ask to make sure I understand how the heating and
> > cooling coils are controlled. For both the DX Cooiling Coil and
a
> > Gas Heating Coil there is no CONTROLLER specified, instead they
use
> > a SET POINT MANAGER to control the discharge temperature (and
the
> > controls are internal to the equipment type.) Should the DX
Cooling
> > Coil Control Node and the Gas Heating Coil Control Node be the
same
> > as the Node the SET POINT MANAGER specifies through the Set
Point
> > Node List?
> >
> > For example:
> >
> > DXSystem:AirLoop,
> > DX Cooling Coil System 1, !- Name of DX Cooling Coil System
> > CoolingCoilAvailSched, !- Availability schedule
> > Mixed Air Node 1, !- DX Cooling Coil System inlet node name
> > Main Cooling Coil 1 Outlet Node, !- DX Cooling Coil System
> > outlet node name
> > Main Cooling Coil 1 Outlet Node, !- DX Cooling Coil System
> > Control Node
> > COIL:DX:CoolingBypassFactorEmpirical, !- Cooling coil type
> > Main Cooling Coil 1; !- Cooling coil name
> >
> > COIL:Gas:Heating,
> > Main heating Coil 1, !- Coil Name
> > ReheatCoilAvailSched, !- Available Schedule
> > 0.8, !- Gas Burner Efficiency of the Coil
> > 29000, !- Nominal Capacity of the Coil {W}
> > Main Cooling Coil 1 Outlet Node, !- Coil_Air_Inlet_Node
> > Main Heating Coil 1 Outlet Node, !- Coil_Air_Outlet_Node
> > Main Heating Coil 1 Outlet Node; !- Coil_Temp_Setpoint_Node
> >
> > SET POINT MANAGER:SCHEDULED,
> > Supply Air Temp Manager 1, !- Name
> > TEMP, !- Control variable
> > Seasonal Reset Supply Air Temp Sch, !- Schedule Name
> > Supply Air Temp Nodes 1; !- Name of the set point Node List
> >
> > NODE LIST,
> > Supply Air Temp Nodes 1, !- Node List Name
> > VAV Sys 1 Outlet Node; !- Node_ID_1
> >
> > Which is from my file and is the same for the example file I
used.
> >
>
> The controls in the 5ZoneAutoDXVAV example are a bit complicated.
As
> you listed above, there is a SET POINT MANAGER:SCHEDULED which
> applies a seasonal setpoint schedule to the "VAV Sys 1 Outlet
Node".
>
> There is also a SET POINT MANAGER:MIXED AIR which takes the
setpoint
> applied to "VAV Sys 1 Outlet Node", subtracts the temperature
> difference across the supply fan and applies this adjusted
setpoint
> to the "Mixed Air Node 1", "Main Cooling Coil 1 Outlet Node", and
> "Main Heating Coil 1 Outlet Node". These nodes are then specified
as
> the control nodes for the economizer, the heating coil, and the
> cooling coil.
>
> The "System Node Setpoint Temp" report variable is helpful in
seeing
> what setpoints are being placed on the various nodes.
>
> Mike
>
>
> ========================================================
> EnergyPlus Testing and Support
> EnergyPlus-Support@g...
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