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[EnergyPlus_Support] Re: How to set up a Coil:Heating:Water object in a CAV system to controls?
Dr. Li,
The simulation can run without errors associated with heating system, but the zone temperature in winter can't be maintained. I believe the HW plant loop is properly set up and well connected with the coils, I can tell from SVG document, otherwise, I would receive fatal errors.
I have to modify DOE-reference building to accommodate some specific system requirement-instead of gas burner, boiler has to be used for heating. and I run into this issue. I can solve it by using CAV-reheat as terminal, instead of having heating coil in airloop and use uncontrolled air terminal. I did not expect to have this issue since I see gas burner in the airloop works fine in the reference model, but when i replace it with hot water coils, i have this problem....
--Ke
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
>
> Cannot tell without the IDF. The error file after running the IDF may tell what is wrong with the code, and it wtill will not tell whether it is designed to work as espected. Why do you need a setpoint manager to control a air loop? If the gas burner works, it means that your plant loop is not properly defined. The coil must be correctly connected in the demmand loop of the HW plant loop with a boiler..
>
> Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: xukevin24@...
> Date: Fri, 27 Jul 2012 19:57:04 +0000
> Subject: [EnergyPlus_Support] Re: How to set up a Coil:Heating:Water object in a CAV system to controls?
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> 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?
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> Thanks.
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> -Ke
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> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Ke Xu" <xukevin24@> wrote:
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> >
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> > 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.
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> > --Ke
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> >
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> > Part of my model related with heating coil is shown below:
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> >
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> > Coil:Heating:Water,
>
> > PSZ_1:1_HEATC, !- Name
>
> > Always_On, !- Availability Schedule Name
>
> > Autosize, !- U-Factor Times Area Value {W/K}
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> > Autosize, !- Maximum Water Flow Rate {m3/s}
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> > PSZ_1:1 HeatingCoilWaterInlet, !- Water Inlet Node Name
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> > PSZ_1:1 HeatingCoilWaterOutlet, !- Water Outlet Node Name
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> > PSZ_1:1_CoolC-PSZ_1:1_HeatCNode, !- Air Inlet Node Name
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> > 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}
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> > 12.7777781162733, !- Rated Inlet Air Temperature {C}
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> > 71.1111111111111, !- Rated Outlet Water Temperature {C}
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> > 43.3333333333334, !- Rated Outlet Air Temperature {C}
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> > 0.5; !- Rated Ratio for Air and Water Convection
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> >
>
> > Controller:WaterCoil,
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> > OS:Controller:WaterCoil 1, !- Name
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> > Temperature, !- Control Variable
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> > Normal, !- Action
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> > Flow, !- Actuator Variable
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> > PSZ_1:1 Supply Equipment Outlet Node, !- Sensor Node Name
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> > PSZ_1:1 HeatingCoilWaterInlet, !- Actuator Node Name
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> > Autosize, !- Controller Convergence Tolerance {deltaC}
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> > Autosize, !- Maximum Actuated Flow {m3/s}
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> > 1e-007; !- Minimum Actuated Flow {m3/s}
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> >
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> > SetpointManager:SingleZone:Heating,
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> > SupAirTemp MngrCore_bottom, !- Name
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> > Temperature, !- Control Variable
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> > 10.0, !- Minimum Supply Air Temperature {C}
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> > 43.3333344812747, !- Maximum Supply Air Temperature {C}
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> > Core_bottom, !- Control Zone Name
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> > Core_bottom Air Node, !- Zone Node Name
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> > 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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