Why is the heating load of ideal ideal-loads-air-system kept at zero.

asked 2024-09-30 04:29:55 -0600

Gardenia
35 ●4

updated 2024-10-04 10:55:34 -0600

sashadf1
1116 ●1 ●40 ●10

Greetings. I am new to using OpenStudio for building heating and cooling load simulations. The versions I am using include SketchUp 2022, OpenStudio Application Version 1.7.0, and EnergyPlus 23.2. In my simulation, I have selected ideal air loads. Upon completion of the simulation, I exported the hourly load data from EnergyPlus results to a CSV file, and the results were successfully generated . However, in the OpenStudio results, specifically under the HVAC Load Profiles section, there are no heating load values displayed.

I have come across some information indicating that this issue could be due to OpenStudio converting heating load data into heating water load. However, it seems that this issue has been addressed in the newer versions. Could you kindly suggest some possible reasons for this issue? I would greatly appreciate your assistance. Thank you very much.

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Hard to say without seeing your model. Can you host it somewhere and share a link?

Julien Marrec ( 2024-09-30 16:37:59 -0600 )edit

It's so kind of you to reply so quickly! I am glad to share my model and the picture that shows the problem. I added the measure named AddOutputVariable. If you don't have it on your end, you can simply choose to delete that part, and it won't affect the output results.Thanks a lot. https://drive.google.com/drive/folder...

Gardenia ( 2024-09-30 21:42:43 -0600 )edit

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answered 2024-10-02 04:55:23 -0600

Julien Marrec

29696 ●94 ●76 http://www.effibem.com/

updated 2024-10-02 05:03:04 -0600

The openstudio_results measure you are using (with OSApp 1.7.0 / OS SDK 3.7.0) is outdated compared to a recent change in EnergyPlus that renamed the "District Heating" column in the SQLFile to "District Heating Water" (as it also added a "District Heating Steam" one).

This was already filed upstream, but I just commented on it as well: https://github.com/NREL/openstudio-co...

That being said, the current issue appears to be only for cashflow, and the HVAC Load Profiles section works fine if you use OpenStudio SDK 3.8.0, meaning you should use the recently released OpenStudio Application 1.8.0 and the latest openstudio_results measure from the BCL.

Then you get the right profile:

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Thank you very much for providing such a detailed answer! After updating the version, a new issue has occurred. I am unable to add the measure named 'openstudio results' showing 'Failed to compute arguments for measure'. I will continue trying to resolve it to verify your response.

Gardenia ( 2024-10-03 07:53:24 -0600 )edit

As Julien said, you should also use the latest openstudio_results measure from the BCL (link text v0.10.0.

lollokai ( 2024-10-04 02:38:26 -0600 )edit

Thank you very much for your suggestion along with the attached link too! And as Julien mentioned, after updating to OpenStudio SDK 3.8.0, the graphs in the OpenStudio results returned to normal (as shown in Figure 3.1). However, the eplusout.eso file exported from EnergyPlus still shows no changes (as shown in Figure 3.2). I have reorganized and re-uploaded the files; feel free to review them if needed. https://drive.google.com/drive/folder...

Gardenia ( 2024-10-04 04:08:56 -0600 )edit

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Why is the heating load of ideal ideal-loads-air-system kept at zero.

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Why is the heating load of ideal ideal-loads-air-system kept at zero.