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

["Jean marais" <jeannieboef@xxxxxxxxx>]

double check your sizing:zone object inputs.
double check that sizing:parameter object input for averaging time is reasonable
double check that your htg and clg setpoint schedules used during sizing are reasonable.
report the hoursloadsnotmet to see when they occure relative to your htg and cooling setpoint curves.
Your unitary unit fan mode schedule should be equal to (or reference) the occupation schedule...this will make it constant during occupation and cycling during unoccupied times to meet the loads.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "FrancescoP" <direzionecontraria@...> wrote:
>
> I have to model system 3 of ASHRAE 90.1-2007 (PSZ-AC, i.e. Packaged rooftop air conditioner, fan: constant volume, cooling type: direct expansion, heating type: district heat). Every AHU is connected to one zone or to two zones that have similar conditions. In some zones I have to model a constant fresh (outdoor) air flow during occupied hours. Therefore for those zones air flow is already determined. To control temperatures in those zone the temperature of supply air shall change in order to meet the heat requirements hour by hour. Here a part of my model:
> 
> AirLoopHVAC:ControllerList,
>     uta 28massaggi1 Controllers,  !- Name
>     Controller:WaterCoil,    !- Controller 1 Object Type
>     uta 28massaggi1 AHU/1  Heating Coil Controller;  !- Controller 1 Name
> 
> Controller:WaterCoil,
>     uta 28massaggi1 AHU/1  Heating Coil Controller,  !- Name
>     Temperature,             !- Control Variable
>     Normal,                  !- Action
>     Flow,                    !- Actuator Variable
>     uta 28massaggi1 Supply Side Outlet 1,  !- Sensor Node Name
>     uta 28massaggi1 AHU/1  Heating Coil Water Inlet Node,  !- Actuator Node Name
>     autosize,                !- Controller Convergence Tolerance {deltaC}
>     autosize,                !- Maximum Actuated Flow {m3/s}
>     0.000;                   !- Minimum Actuated Flow {m3/s}
> 
> SetpointManager:SingleZone:Heating,
>     sm 28massaggi1 H,        !- Name
>     Temperature,             !- Control Variable
>     5,                       !- Minimum Supply Air Temperature {C}
>     80,                      !- Maximum Supply Air Temperature {C}
>     00interrato:28massaggi1, !- Control Zone Name
>     00interrato:28massaggi1 Zone Air Node,  !- Zone Node Name
>     uta 28massaggi1 Zone Splitter/1 Outlet Node 1,  !- Zone Inlet Node Name
>     uta 28massaggi1 Supply Side Outlet 1;  !- Setpoint Node or NodeList Name
> 
> ZoneControl:Thermostat,
>     00interrato:28massaggi1 Thermostat,  !- Name
>     00interrato:28massaggi1, !- Zone or ZoneList Name
>     48,                      !- Control Type Schedule Name
>     ThermostatSetpoint:DualSetpoint,  !- Control 1 Object Type
>     00interrato:28massaggi1 Dual SP;  !- Control 1 Name
> 
> ThermostatSetpoint:DualSetpoint,
>     00interrato:28massaggi1 Dual SP,  !- Name
>     I28,                     !- Heating Setpoint Temperature Schedule Name
>     E90C;                    !- Cooling Setpoint Temperature Schedule Name
> 
> The problem is that the zone temperature does not meet the setpoint temperature (during winter it is too cold). Components are autosized. As sizing period one summer day and one winter day are used (SizingPeriod:DesignDay objects). In some zones also during sizing periods setpoint temperatures are not met. No reheat coils exist.
> Any advice, please? 
> I see that this discussion focused on the same subject, but I am not able to find a solution.
> With Regards
> Francesco Passerini
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Ke Xu" <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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