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indoor temperature

asked 2015-07-11 09:41:34 -0500

thiathia gravatar image

updated 2015-07-11 10:47:31 -0500

Hi. I am trying to get temperatures inside my spaces without any cooling system using only air exchanges. I applied a design infiltration flow rate but it doent seem to make a difference in the temperatures I get. I feel like open studio calculates the zone air temperatures considering all fenestration closed or my aim is to have the temperature when windows are open. Any propositions to help?

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can i contact u,i m trying to get the same indoor temperature,but i cant

djbox9 gravatar image djbox9  ( 2016-08-26 09:10:05 -0500 )edit

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answered 2015-07-13 09:16:52 -0500

You can try using the ZoneVentilation:DesignFlowRate object (this is in EnergyPlus but might also be available in OpenStudio) or the airflow network in EnergyPlus. If these objects are not available in OpenStudio you can export out and use the examples files and the input output reference guide in EnergyPlus to help you fill them in. ZoneVentilation:DesignFlowRate is very straight forward though.

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thx you. I tried designflowrate and it is working. Thx again

thiathia gravatar image thiathia  ( 2015-07-15 10:52:58 -0500 )edit
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answered 2015-07-11 12:12:29 -0500

Waseem gravatar image

updated 2015-07-11 12:18:54 -0500

I think you are trying to cool down (decrease room air temperature of) your thermal zone using natural ventilation, right? Recently, I used EnergyPlus EMS sensors and actuators to open windows of a thermal zone during occupied period.

See below the way I defined actuators and sensors;

    EnergyManagementSystem:Actuator,
    Flow_Actuator37, ! Name
    Block1:Zone1_Wall_5_0_0_14_0_14_Win, ! Component Name
    AirFlow Network Window/Door Opening, ! Component Type
    Venting Opening Factor; ! Control Variable

    EnergyManagementSystem:Sensor,
    E01airTemperature,          !- Name
    Block1:Zone1,              !- Output:Variable or Output:Meter Index Key Name
    Zone Mean Air temperature;  !- Output:Variable or Output:Meter Name

    EnergyManagementSystem:Sensor,
    Occu_Schedule, !- Name
    Office_OpenOff_Occ,    !- Output:Variable or Output:Meter Index Key Name   Occupancy Schedule
    Schedule Value;  !- Output:Variable or Output:Meter Name

One sensor is for occupancy schedule and the second one is for zone air temperature.

P.S: There are other ways of simulating natural ventilation in EnergyPlus as well.

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thx for your help. but I am a new user of both energy plus and open studio so I do not really undrestand your proposition Can you tell me more about those other ways of simulating natural ventilation in energy plus you told about? Thx

thiathia gravatar image thiathia  ( 2015-07-13 11:59:18 -0500 )edit

@thiathia: The other methods are mentioned by Annie Marston. The way I did was to have one sensor for occupancy and one for indoor air temperature. There was also one actuator for venting opening factor. The EMS program was using sensor values and if occupancy was greater than 1 and indoor air temperature was greater than 23C, then it opened the windows. A venting factor of 0 means window fully closed and a factor of 1 means the other way around.

Waseem gravatar image Waseem  ( 2015-07-14 03:53:29 -0500 )edit

Also, as Annie mentioned that ZoneVentilation:DesignFlowRate is the straightforward method to use, you may have a look at that.

Waseem gravatar image Waseem  ( 2015-07-14 03:55:01 -0500 )edit

@thiathia pls inbox me djbox9@gmail.com i need u to teach me

djbox9 gravatar image djbox9  ( 2016-08-26 09:10:45 -0500 )edit

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Asked: 2015-07-11 09:41:34 -0500

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Last updated: Jul 13 '15