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How to set the cooling to zero

asked 2021-03-02 03:51:14 -0600

Clu's avatar

updated 2021-04-17 13:50:07 -0600

Hi all,

it is my first time typing here and asking for some help. I am having issues in setting the cooling to zero.

My goal is to run a simulation where in the rooms there is a heating system (simplified, i just need to understand how much heating we need to keep the internal temperature abiove a certain target) but not cooling system.

I have built my EnergyPlus model through the GH-plugins HB and LB. Therefore, i set the coolign setpoint to 100°C in order to not have any cooling. However, i have Ideal cooling Loads more than 0 and no matter what changes i do (limit flow rate or limit capacity of the cooling to 0), i still have Ideal Cooling Loads more than 0. I also tried to build it from scratch again through Zone HVAC: Zone controls and Thermostats (ZoneControl:Thermostat, ThermostatSetpoint:SingleHeating) but i wasn't able to make it work unfrotunately.

Here below you can find the link to my .idf file:

It would be great if you can help me with this.

Thanks a lot

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@Clu you should have enough karma points now to provide a link to your IDF instead of pasting the IDF contents into your post.

Aaron Boranian's avatar Aaron Boranian  ( 2021-03-02 07:55:19 -0600 )edit

Hi Aaron, thanks. I actually just tried to attach the .idf file now but i receive the following comment: "allowed file types are '.jpg', '.jpeg', '.gif', '.bmp', '.png', '.tiff'".

Is there any other way i can attach it? Thanks Claudia

Clu's avatar Clu  ( 2021-03-02 08:32:01 -0600 )edit

@Clu you will need to upload your IDF to a file sharing service like Google Drive, Dropbox, etc. and then share a link here for others to access the IDF.

Aaron Boranian's avatar Aaron Boranian  ( 2021-03-02 08:51:38 -0600 )edit

It seems the Google Drive link is restricted since it asks for access. What Output:Variables did you report to check the cooling load?

Ammar De's avatar Ammar De  ( 2021-03-02 09:58:48 -0600 )edit

Hi Anmar, thanks a lot for your comment. The output is Zone Idea Loads Zone Total Cooling rate. Btw I tried to change the access to the Drive to everyone. Hope it works now

Clu's avatar Clu  ( 2021-03-02 10:10:51 -0600 )edit

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answered 2021-03-02 10:52:32 -0600

Ammar De's avatar

updated 2021-03-02 10:59:06 -0600

There are multiple ways to consider heating/cooling only and you mentioned a few. If you check the ".html" report file which shows annual energy end uses, you will notice that cooling energy (under district cooling) is actually zero. So I believe that you need to consider reporting different output variables that will better reflect the energy use as shown below. The Zone Ideal Loads Supply Air Total Cooling Energy output variable is the district cooling energy consumed by the ideal loads system “cooling coil” to cool and dehumidify the supply air. After adding this variable, you should see that cooling is always zero based on your attempt to force cooling to be zero. You can read more about the Ideal air load systems and its different output variables (You should pay attention to the output variables in case you have outdoor air/heat recovery systems).

    *,                       !- Key Value
    Zone Ideal Loads Supply Air Total Heating Energy ,  !- Variable Name
    Hourly;                  !- Reporting Frequency

    *,                       !- Key Value
    Zone Ideal Loads Supply Air Total Cooling Energy ,  !- Variable Name
    Hourly;                  !- Reporting Frequency
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Thanks a lot Ammar! I understand and it makes sense now.

Clu's avatar Clu  ( 2021-03-03 08:07:35 -0600 )edit

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Asked: 2021-03-02 03:51:14 -0600

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Last updated: Mar 03 '21