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Dual setpoint (Heating is not working)

asked 2021-03-02 14:10:42 -0500

Azzam_UoN's avatar

updated 2021-03-05 09:08:09 -0500

Hello There,

Thank you for the help in advance.

I'm trying to apply Window type AC unit in my energy model. The model works, but the issue is with my heating setpoint. Even-though I'm using dual set points the model, cooling 20C and heating 15C. The system does not work in January where the temperature is less than 15C. In other words, the model does not consider my heating setpoint and does not preform heating. The indoor air temperature (IAT) is fluctuating in the beginning of the year (Cold weather) and no heat setpoint seems to be working, until IAT reaches the cooling set point, then it goes in a straight line. When the IAT is less than the cooling setpoint and less than the heating setpoint, the heating system does not work.

    Zone 1 Thermostat,       !- Name
    G1,                      !- Zone or ZoneList Name
    Zone Control Type Sched, !- Control Type Schedule Name
    ThermostatSetpoint:DualSetpoint,  !- Control 1 Object Type
    Dual Setpoint with DB;   !- Control 1 Name

    Zone Control Type Sched, !- Name
    Control Type,            !- Schedule Type Limits Name
    Through: 12/31,          !- Field 1
    For: AllDays,            !- Field 2
    Until: 24:00,            !- Field 3
    4;                       !- Field 4

    Dual Setpoint with DB,   !- Name
    Heating Setpoints,       !- Heating Setpoint Temperature Schedule Name
    Cooling Setpoints;       !- Cooling Setpoint Temperature Schedule Name

    Cooling Setpoints,       !- Name
    Temperature,             !- Schedule Type Limits Name
    Through: 12/31,          !- Field 1
    For: AllDays,            !- Field 2
    Until:  7:00,            !- Field 3
    20.0,                    !- Field 4
    Until: 17:00,            !- Field 5
    20.0,                    !- Field 6
    Until: 24:00,            !- Field 7
    20.0;                    !- Field 8

    Heating Setpoints,       !- Name
    Temperature,             !- Schedule Type Limits Name
    Through: 12/31,          !- Field 1
    For: AllDays,            !- Field 2
    Until:  7:00,            !- Field 3
    15,                      !- Field 4
    Until: 17:00,            !- Field 5
    15,                      !- Field 6
    Until: 24:00,            !- Field 7
    15;                      !- Field 8
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I'm confused. You are modeling a window air conditioner, but expecting it to provide heating?

shorowit's avatar shorowit  ( 2021-03-03 14:26:12 -0500 )edit

Some window type air-conditionings provide both cooling and heating. And my model has its window type unit for only cooling and I'm trying to have heating consumption as well. Is it possible to add heating ability to the window AC or I have to install another AC type? Which one is the closest to the Window AC system for heating and cooling?

Azzam_UoN's avatar Azzam_UoN  ( 2021-03-04 02:53:50 -0500 )edit

In that case, can you provide a link to your IDF (using something like Google Drive or Dropbox)? I don't think anyone can help you with the limited information you provided.

shorowit's avatar shorowit  ( 2021-03-04 09:11:32 -0500 )edit

This is the link to the .idf and weather file. The Window AC is only applied to one single zone, Zone G1 (ONE ROOM). I'm thinking of having heating in winter if it is possible.

Thank you

Azzam_UoN's avatar Azzam_UoN  ( 2021-03-05 03:42:05 -0500 )edit

1 Answer

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answered 2021-03-05 08:45:17 -0500

You don't have any heating equipment defined in your model. The ZoneHVAC:WindowAirConditioner object only provides cooling. Either add an additional ZoneHVAC object that provides heating (like ZoneHVAC:UnitHeater) or switch to an object that provides both heating and cooling (like ZoneHVAC:PackagedTerminalAirConditioner).

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Thank you so much. this is very helpful.

Azzam_UoN's avatar Azzam_UoN  ( 2021-04-25 10:17:21 -0500 )edit

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Asked: 2021-03-02 12:33:30 -0500

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Last updated: Mar 05 '21