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Re: [EnergyPlus_Support] ThermostatSetpoint:DualSetpoint heating value not working (?)
If your air is supplied at the correct temperature, as you say, then you just don't have enough flow. If you are autosizing, there are two important sizing objects, namely, sizing:zone and sizing:plant. Furthermore, it is very important to know which schedule values are going to be used during sizing run periods, normally summerdesignday and winterdesignday.
Mit freundlichen Grü�en- Sent from my iPhone (excuse the brevity)
i. A.
Jean Marais
b.i.g. bechtold
Tel. +49 30 6706662-23
On 14.05.2014, at 12:43, "<mailto:lmblanes@xxxxxxxxx>lmblanes@xxxxxxxxx [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>
Hi modelers
>
> I have a model with a zone which is controlled by
>
> ZoneControl:Thermostat ---> ThermostatSetopint:DualSetpoint
> set to 19 deg. C and 26 deg. C and
> ZoneControl:Humidistat
> set to 50% RH
>
> This zone is served by a SingleDuct VAV AHU with Preheating Coil, Cooling Coil, Humidifier and Heating Coil.
> AHU also operates an Outdoor Air System with Heat Exchanger.
> Zone equipment is AirTerminal:SingleDuct:VAV:NoReh
>
> Basically the system maintains the higher setpoint for the zoner at 26 degC in summer, but it doesn't maintains the 19 degC in Winter (although Heating Coil is working).
>
> The setpoint temperature at the Air Loop Supply Side Outlet 1 works at the maximum of 31deg C for winter time, but Although Heating Coil and PreHeating Coil are working it looks like there is not enough capacity (?) to reach the calculated setpoint.
>
> I attach some graphs.
> Any ideas about what may be happening?
> Thanks from Hibernia.
>
> Here some of the objects:
>
> !- =========== ALL OBJECTS IN CLASS: CONTROLLER:WATERCOIL ===========
>
> Controller:WaterCoil,
> Air Loop AHU Pre-heat Heating Coil Controller, !- Name
> Temperature, !- Control Variable
> Normal, !- Action
> Flow, !- Actuator Variable
> Air Loop AHU Pre-heat Heating Coil Air Outlet Node, !- Sensor Node Name
> Air Loop AHU Pre-heat 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}
>
> Controller:WaterCoil,
> Air Loop AHU Cooling Coil Controller, !- Name
> Temperature, !- Control Variable
> Reverse, !- Action
> Flow, !- Actuator Variable
> Air Loop Supply Side Outlet 1, !- Sensor Node Name
> Air Loop AHU Cooling 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}
>
> Controller:WaterCoil,
> Air Loop AHU Heating Coil Controller, !- Name
> Temperature, !- Control Variable
> Normal, !- Action
> Flow, !- Actuator Variable
> Air Loop Supply Side Outlet 1, !- Sensor Node Name
> Air Loop AHU 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}
>
> !- =========== ALL OBJECTS IN CLASS: CONTROLLER:OUTDOORAIR ===========
>
> Controller:OutdoorAir,
> Air Loop AHU Outdoor Air Controller, !- Name
> Air Loop AHU Relief Air Outlet, !- Relief Air Outlet Node Name
> Air Loop AHU Extract Fan Air Outlet Node, !- Return Air Node Name
> Air Loop AHU Mixed Air Outlet, !- Mixed Air Node Name
> Air Loop AHU Outdoor Air Inlet, !- Actuator Node Name
> autosize, !- Minimum Outdoor Air Flow Rate {m3/s}
> autosize, !- Maximum Outdoor Air Flow Rate {m3/s}
> FixedDryBulb, !- Economizer Control Type
> ModulateFlow, !- Economizer Control Action Type
> 25.00, !- Economizer Maximum Limit Dry-Bulb Temperature {C}
> , !- Economizer Maximum Limit Enthalpy {J/kg}
> , !- Economizer Maximum Limit Dewpoint Temperature {C}
> , !- Electronic Enthalpy Limit Curve Name
> 11, !- Economizer Minimum Limit Dry-Bulb Temperature {C}
> NoLockout, !- Lockout Type
> FixedMinimum, !- Minimum Limit Type
> , !- Minimum Outdoor Air Schedule Name
> , !- Minimum Fraction of Outdoor Air Schedule Name
> , !- Maximum Fraction of Outdoor Air Schedule Name
> , !- Mechanical Ventilation Controller Name
> , !- Time of Day Economizer Control Schedule Name
> No, !- High Humidity Control
> Arrivi_UTA_01:Arrivi_UTA_01, !- Humidistat Control Zone Name
> 1, !- High Humidity Outdoor Air Flow Ratio
> Yes, !- Control High Indoor Humidity Based on Outdoor Humidity Ratio
> BypassWhenWithinEconomizerLimits; !- Heat Recovery Bypass Control Type
>
> !- =========== ALL OBJECTS IN CLASS: AIRLOOPHVAC:CONTROLLERLIST ===========
>
> AirLoopHVAC:ControllerList,
> Air Loop AHU Outside air Controller List, !- Name
> Controller:OutdoorAir, !- Controller 1 Object Type
> Air Loop AHU Outdoor Air Controller, !- Controller 1 Name
> Controller:WaterCoil, !- Controller 2 Object Type
> Air Loop AHU Pre-heat Heating Coil Controller; !- Controller 2 Name
>
> AirLoopHVAC:ControllerList,
> Air Loop Controllers, !- Name
> Controller:WaterCoil, !- Controller 1 Object Type
> Air Loop AHU Cooling Coil Controller, !- Controller 1 Name
> Controller:WaterCoil, !- Controller 2 Object Type
> Air Loop AHU Heating Coil Controller; !- Controller 2 Name
>
> !- =========== ALL OBJECTS IN CLASS: SETPOINTMANAGER:SCHEDULED ===========
>
> SetpointManager:Scheduled,
> Air Loop AHU Pre-heat Heating Coil Setpoint Manager, !- Name
> Temperature, !- Control Variable
> 58, !- Schedule Name (This is set to always 5 deg.C)
> Air Loop AHU Pre-heat Heating Coil Air Outlet Node; !- Setpoint Node or NodeList Name
>
> SetpointManager:Scheduled,
> BoilerSetpoint Manager, !- Name
> Temperature, !- Control Variable
> 41, !- Schedule Name
> Boiler Outlet Node; !- Setpoint Node or NodeList Name
>
> SetpointManager:Scheduled,
> Chiller Chiller Setpoint Manager, !- Name
> Temperature, !- Control Variable
> 40, !- Schedule Name
> Chiller CHW Outlet Node; !- Setpoint Node or NodeList Name
>
> SetpointManager:Scheduled,
> HW Loop Setpoint Manager,!- Name
> Temperature, !- Control Variable
> 41, !- Schedule Name
> HW Loop Setpoint Manager Node List; !- Setpoint Node or NodeList Name
>
> SetpointManager:Scheduled,
> CHW Loop Setpoint Manager, !- Name
> Temperature, !- Control Variable
> 40, !- Schedule Name
> CHW Loop Setpoint Manager Node List; !- Setpoint Node or NodeList Name
>
> SetpointManager:Scheduled,
> Condenser Loop Setpoint Manager, !- Name
> Temperature, !- Control Variable
> 42, !- Schedule Name
> Condenser Loop Setpoint Manager Node List; !- Setpoint Node or NodeList Name
>
>
> !- =========== ALL OBJECTS IN CLASS: SETPOINTMANAGER:OUTDOORAIRRESET ===========
>
> SetpointManager:OutdoorAirReset,
> Air Loop Setpoint Manager, !- Name
> Temperature, !- Control Variable
> 31, !- Setpoint at Outdoor Low Temperature {C}
> 10, !- Outdoor Low Temperature {C}
> 14.00, !- Setpoint at Outdoor High Temperature {C}
> 35, !- Outdoor High Temperature {C}
> Air Loop Setpoint Manager Node List; !- Setpoint Node or NodeList Name
> (this is Air Loop Supply Side Outlet 1)
>
>
> !- =========== ALL OBJECTS IN CLASS: SETPOINTMANAGER:SINGLEZONE:HUMIDITY:MINIMUM ===========
>
> SetpointManager:SingleZone:Humidity:Minimum,
> Setpoint Manager, !- Name
> , !- Control Variable
> , !- Schedule Name
> Setpoint Manager Node List, !- Setpoint Node or NodeList Name
> (Air Loop AHU Steam Humidifier Air Outlet Node)
> Arrivi_UTA_01:Arrivi_UTA_01 Zone Air Node; !- Control Zone Air Node Name
>
> !- =========== ALL OBJECTS IN CLASS: SETPOINTMANAGER:MIXEDAIR ===========
>
> SetpointManager:MixedAir,
> Air Loop AHU Outside air system Mixed Air Manager, !- Name
> Temperature, !- Control Variable
> Air Loop Supply Side Outlet 1, !- Reference Setpoint Node Name
> Air Loop AHU Heating Coil Air Outlet Node, !- Fan Inlet Node Name
> Air Loop Supply Side Outlet 1, !- Fan Outlet Node Name
> Air Loop AHU Mixed Air Outlet; !- Setpoint Node or NodeList Name
>
> SetpointManager:MixedAir,
> Air Loop AHU Cooling Coil Mixed Air Manager, !- Name
> Temperature, !- Control Variable
> Air Loop Supply Side Outlet 1, !- Reference Setpoint Node Name
> Air Loop AHU Heating Coil Air Outlet Node, !- Fan Inlet Node Name
> Air Loop Supply Side Outlet 1, !- Fan Outlet Node Name
> Air Loop AHU Cooling Coil Air Outlet Node; !- Setpoint Node or NodeList Name
>
> SetpointManager:MixedAir,
> Air Loop AHU Heating Coil Mixed Air Manager, !- Name
> Temperature, !- Control Variable
> Air Loop Supply Side Outlet 1, !- Reference Setpoint Node Name
> Air Loop AHU Heating Coil Air Outlet Node, !- Fan Inlet Node Name
> Air Loop Supply Side Outlet 1, !- Fan Outlet Node Name
> Air Loop AHU Heating Coil Air Outlet Node; !- Setpoint Node or NodeList Name
>
>
> <Supp_AirOutlet_SP and Temp_winter.JPG>
> <HC and PreHC water in-out temp.JPG>
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