[EnergyPlus_Support] Re: How to set up a Coil:Heating:Water object in a CAV system to controls?

["Jean marais" <jeannieboef@xxxxxxxxx>]

Did you limit the max air flow rate somewhere eg at the fan object?

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Ke Xu" <xukevin24@...> wrote:
>
> I feel the same way. Most of hot water coils are controlled to maintain the supply air temperature set point, but in some cases, especially for single zone CAV unit, the hot water valve could be controlled directly to maintain zone temperature set point. Just curious why gas furnace can be set up that way, but not for the water coils.
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent" <brent.griffith@> wrote:
> >
> > The water coil controller works better when it uses the coil air outlet node for the sensor node.
> > 
> > From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Ke Xu
> > Sent: Friday, July 27, 2012 1:57 PM
> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > Subject: [EnergyPlus_Support] Re: How to set up a Coil:Heating:Water object in a CAV system to controls?
> > 
> > 
> > 
> > Still couldn't make it work. But Gas furnace will work, see those DOE-reference buildings. My understanding is that the setpointmanager:singlezone:heating is not designed to work with water heating coils in the air loop? anyone test it before?
> > Thanks.
> > 
> > -Ke
> > 
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx<mailto:EnergyPlus_Support%40yahoogroups.com>, "Ke Xu" <xukevin24@<mailto:xukevin24@>> wrote:
> > >
> > > Dear all,
> > > I am simulating a constant air volume system with a hot-water heating coil in the air-loop, and I am trying to set up controls for coil to maintain supply air temperature set point calculated to maintain the zone temperature. the objects I am using include "Coil: Heating: Water", "Controller: WaterCoil" and "SetpointManager:SingZone:Heating". Somehow, it doesn't work as I expected, the zone temperature in winter time can't be maintained. Any help and comments are appreciated. Thanks in advance.
> > >
> > > --Ke
> > >
> > > Part of my model related with heating coil is shown below:
> > >
> > > Coil:Heating:Water,
> > > PSZ_1:1_HEATC, !- Name
> > > Always_On, !- Availability Schedule Name
> > > Autosize, !- U-Factor Times Area Value {W/K}
> > > Autosize, !- Maximum Water Flow Rate {m3/s}
> > > PSZ_1:1 HeatingCoilWaterInlet, !- Water Inlet Node Name
> > > PSZ_1:1 HeatingCoilWaterOutlet, !- Water Outlet Node Name
> > > PSZ_1:1_CoolC-PSZ_1:1_HeatCNode, !- Air Inlet Node Name
> > > PSZ_1:1_HeatC-PSZ_1:1_FanNode, !- Air Outlet Node Name
> > > UFactorTimesAreaAndDesignWaterFlowRate, !- Performance Input Method
> > > Autosize, !- Rated Capacity {W}
> > > 82.2222222222222, !- Rated Inlet Water Temperature {C}
> > > 12.7777781162733, !- Rated Inlet Air Temperature {C}
> > > 71.1111111111111, !- Rated Outlet Water Temperature {C}
> > > 43.3333333333334, !- Rated Outlet Air Temperature {C}
> > > 0.5; !- Rated Ratio for Air and Water Convection
> > >
> > > Controller:WaterCoil,
> > > OS:Controller:WaterCoil 1, !- Name
> > > Temperature, !- Control Variable
> > > Normal, !- Action
> > > Flow, !- Actuator Variable
> > > PSZ_1:1 Supply Equipment Outlet Node, !- Sensor Node Name
> > > PSZ_1:1 HeatingCoilWaterInlet, !- Actuator Node Name
> > > Autosize, !- Controller Convergence Tolerance {deltaC}
> > > Autosize, !- Maximum Actuated Flow {m3/s}
> > > 1e-007; !- Minimum Actuated Flow {m3/s}
> > >
> > > SetpointManager:SingleZone:Heating,
> > > SupAirTemp MngrCore_bottom, !- Name
> > > Temperature, !- Control Variable
> > > 10.0, !- Minimum Supply Air Temperature {C}
> > > 43.3333344812747, !- Maximum Supply Air Temperature {C}
> > > Core_bottom, !- Control Zone Name
> > > Core_bottom Air Node, !- Zone Node Name
> > > Core_bottom Direct Air Inlet Node Name, !- Zone Inlet Node Name
> > > PSZ_1:1 Supply Equipment Outlet Node; !- Setpoint Node or NodeList Name
> > >
> >
>




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