Re: [EnergyPlus_Support] Discussion on EMS use in Energyplus on Opening factor Control

["Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

your ems directly sets the component. perhaps you want to set the component as fully open in the idf and then manipulate the component's schedule instead with ems? from memory there are a couple of variables which are multiplied with each other to deturmine how open the window is.

On Thu, 8 Nov 2018, 22:10 shahaohan@xxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx wrote:

 

When I'm checking the simulation example in the energyplus, I found a EMS problem relating to the opening factor Control. In theEMSAirflowNetworkOpeningControlByHumidity.idf, the example file shows a EMS control to the surface:Zn001:Wall001:Win001 by humidity. At the same time, the example file set a venting availability schedule in the Zone Level to control the Opening time. The Venting schedule is below:

Schedule:Compact, VentingSched, !- Name Fraction, !- Schedule Type Limits Name Through: 12/31, !- Field 1 For: AllDays, !- Field 2 Until: 7:00,1.0, !- Field 3 Until: 17:00,0.0, !- Field 5 Until: 24:00,1.0; !- Field 7

The EMS control code is below:

EnergyManagementSystem:Sensor, ZoneRH, !- Name Zone 1 Node, !- Output:Variable or Output:Meter Index Key Name System Node Relative Humidity; !- Output:Variable or Output:Meter Name

EnergyManagementSystem:Actuator, MyOpenFactor, !- Name Zn001:Wall001:Win001, !- Actuated Component Unique Name AirFlow Network Window/Door Opening, !- Actuated Component Type Venting Opening Factor; !- Actuated Component Control Type

EnergyManagementSystem:ProgramCallingManager, RH Controlled Open Factor, !- Name BeginTimestepBeforePredictor, !- EnergyPlus Model Calling Point RH_OpeningController; !- Program Name 1

EnergyManagementSystem:Program, RH_OpeningController, !- Name IF ZoneRH < 25, !- Program Line 1 SET MyOpenFactor = 0.0, !- Program Line 2 ELSEIF ZoneRH > 60, !- SET MyOpenFactor = 1.0, !- ELSE, !- SET MyOpenFactor = (ZoneRH - 25) / (60 - 25), !- ENDIF; !-

Then, when I checking the results, I found that the Venting availability Schedule is ignored by applying the EMS, which means users cannot control the opening factors based on time! Did anyone discover this irrational problem? Is this a Bug or error? How can user control the openings with EMS and time?

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Posted by: Jean Marais <jeannieboef@xxxxxxxxx>

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