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openable windows on schedule

asked 2015-06-01 07:18:37 -0500

ellimelimeli's avatar

updated 2017-05-04 06:05:52 -0500

Hi guys! Does anyone know how I can put an interzone door and window and an exterior door, window to open and close on a scheduled basis? I am using EnergyPlus' Idf Editor and the venting schedule is independent of the conditions.

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Depends on the software you are using. Which one?

keb's avatar keb  ( 2015-06-01 08:59:51 -0500 )edit

Can you let us know which simulation engine you are using and what effects you are trying to capture? Are you controlling the window to help meet temperature set points or is the opening schedule independent of inside/outside conditions?

macumber's avatar macumber  ( 2015-06-01 09:04:40 -0500 )edit

I have just discovered this instruction on Input Output Reference: "AirflowNetwork:Multizone:Zone This object allows control of natural ventilation through exterior and interior openings in a zone, where “opening” is defined as an openable window or door. (Note that only window, door or glass door subsurfaces in a zone that are specified using AirflowNetwork:MultiZone:Component:DetailedOpening, AirflowNetwork:MultiZone:Component:HorizontalOpening or AirflowNetwork:Multizone:Component:SimpleOpening and have an associated AirflowNetwork:Multizone:Surface object are considered to be openings)"

ellimelimeli's avatar ellimelimeli  ( 2015-06-01 15:32:13 -0500 )edit

So I'm guessing this must be it, choosing constant for ventilation control mode, but don't know what to put in the field AirFlow:Network:Multizone:Component:Simple Opening, for "AirMass flow coefficient when opening is closed", "minimum density difference for two-way flow" and "discharge coefficient". ???

ellimelimeli's avatar ellimelimeli  ( 2015-06-01 15:36:12 -0500 )edit

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answered 2015-08-07 03:20:17 -0500

If you have to model opening/closing only external doors and windows, there is a simple solution:

  • (A) You may specify ZoneInfiltration:EffectiveLeakageArea(s) for every zone, and define a schedule for the flow fraction (0=closed, 1=fully open);

    For more specialized requirements, the schedule values may be driven by an EMS program (by defining actuators on these schedules)

If you want to model air exchange through external and internal doors/windows, this can be done by setting up an AirflowNetwork for your zones:

  • (B) for each window/door specify a corresponding AirflowNetwork:MultiZone:Surface and define Leakage Components:

    set Window/Door Opening Factor >0 (<=1 );

    set Ventilation Control Mode=constant

    now define a VentingAvailability Schedule: this will dynamically drive the Venting Window/Door Opening Factor by this formula: [AFN Surface Venting Window/Door Opening Factor] = [Window/Door Opening Factor] * [VentingAvailability]

    (0=closed, 1= fully open). You can verify whether the air flows behave as intended e.g. by checking the output variables:

    Key Value = AirflowNetwork:MultiZone:Surface Name

    Variable Name = AFN Linkage Node 1 to Node 2 Mass Flow Rate

    (from AirflowNetwork:MultiZone:Surface to the other side)

    Variable Name = AFN Linkage Node 2 to Node 1 Mass Flow Rate
    (from the other side to AirflowNetwork:MultiZone:Surface )

  • (C) If window/door openings should depend on special user defined conditions, define an EMS Actuator, e.g. myOpenFactor, for one surface of each Door/Window, with

    Actuated Component Type = AirFlow Network Window/Door Opening

    Actuated Component Control Type = Venting Opening Factor

    The dynamic value of myOpenFactor then is determined by an EMS program. More details can be studied in the Example file EMSAirflowNetworkOpeningControlByHumidity.idf

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Asked: 2015-06-01 07:18:37 -0500

Seen: 2,023 times

Last updated: Aug 07 '15