Control Schemes

Location = Libraries/Controls and Performance Data/Control Schemes

Simergy in 3s Reminder:

• Controllers reference schedules, control schemes, and potentially control scheme lists
• Control Schemes reference schedules
• Control Scheme Lists Reference Control Schemes

Control schemes are typically referenced by Controllers.  They provide the link to the schedules, which shape the control schemes.  They are typically part of the input values for the different controller properties that can be accessed within the diagram workspace of the Zone HVAC Groups, Air Loops or any of the Water Loop types. The Control Scheme can be selected by expanding the Control Name field in the Controller Properties and selecting from the drop down list (figure below).

Figure - The Control Scheme can be selected from the drop down list in the expanded control name field for the Controller Properties (shown on lower left section of Workspace)

Note: Although not yet fully implemented the intent is that for each section there will be links directly to the EnergyPlus Input Output Reference.  In addition the links will also be included in the Type and Sub Type Mapping Table.

Type and Sub Type Mapping

The Type and Sub Type options that can be selected from the drop down lists in that area of the workspace, which filter the Source Library to display the variables the user can select to include, along with a value, in a Library Entry.

Availability Manager Schemes

Are System Level Controls that appear in either Air Loops or Water Loops in the Diagram Workspace.  Some of the managers monitor the temperature at an air or plant node to determine whether the system should be on or off.

Version 1 Note:  The following Availability Manager Schemes that are included with the Simergy Installation reference a Sensor Node Name that is required for EnergyPlus to run.  The Sensor Node Name is currently automatically set (hard-wired) to the Outside Air Node in the project, and you cannot edit this directly within Simergy in Version 1.  If you wish to change this value you will need to edit the IDF file that is created by Simergy manually.  

• AvailabilityManager:HighTemperatureTurnOff

• AvailabilityManager:LowTemperatureTurnOff

• AvailabilityManager:HighTemperatureTurnOn

• AvailabilityManager:LowTemperatureTurnOn

The actual action of turning on or off a loop is taken by the loop prime movers: fans for Air Loops and zone components, and pumps for Plant (Water) loops. For instance when a fan is deciding whether it is on or off, it checks its on/off schedule and whether the loop availability status flag is CycleOn or ForceOff. If the schedule is on and the status flag is ForceOff, the fan will be off. If the fan schedule says off and the status flag is CycleOn, the fan will be on. Thus the availability managers overrule the fan on/off schedule. The availability managers, air loops, and plant loops all have report variables which may be used to verify the action of the loop.

Availability managers for AirLoopHVAC systems also control the availability of zone exhaust fans (Ref. Fan:ZoneExhaust) and terminal unit fans (Ref. AirTerminal:SingleDuct:SeriesPIU: Reheat, AirTerminal:SingleDuct: ParallelPIU:Reheat, and AirTerminal:SingleDuct:VAV: Reheat:VariableSpeedFan) in the zones served by the AirLoopHVAC system.

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