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Trouble-shooting Energyplus sizing calculation

asked 2015-11-23 14:48:18 -0600

SVVitale gravatar image

updated 2015-11-23 15:53:30 -0600

I am trying to troubleshoot my Energyplus/Openstudio sizing results. Is there a way to obtain a load breakdown for lighting, internal equipment, people and most-importantly envelope gains (conductance and solar)? I am seeing Energyplus sizing results that are very far-off what I would expect based on running Trane Trace 700 to perform the envelope loss/gain calculations.

What I would like to do is find a way to break down the Energyplus sizing so I can trouble-shoot where I am going wrong with my inputs.

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answered 2015-11-24 07:02:41 -0600

Yes, you can export the model to the .idf, but there is one way more easy, fast and that allows you to change the model direct in OS.

Use the measure zone_report available in BCL. It can be use direct in OpenStudio and will activate the report ZoneComponentLoadSummary.

https://bcl.nrel.gov/node/82313

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answered 2015-11-23 15:36:13 -0600

Add this to your input file if not already included:

OutputControl:Table:Style,
  HTML;                    !- Column Separator

Output:Table:SummaryReports,
  AllSummary,              !- Report 1 Name
  ZoneComponentLoadSummary;!- Report 2 Name

Then review the YourFileNameTable.html

Look at the Lighting, Equipment, and Sensible Heat Gain Summary reports.

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Thank you, but I have several dumb questions since I'm working thru Openstudio and not directly with Energyplus files: 1. Where is my input file typically saved? 2. Once I edit my input file directly in a text editor, how to I process it? 3. Once I edit my input file directly, am I decoupling my model from Openstudio?

Sorry for the dumb questions.

SVVitale gravatar image SVVitale  ( 2015-11-23 16:28:59 -0600 )edit
1

@SVVitale: To answer your questions: if you've run a successful simulation with OpenStudio, the idf will be in your project directory (same name and parent directory as your .osm file)\run\5-EnergyPlusPreProcess-0 as 'out.osm'. Once you edit the idf (preferably after copying and pasting to a new location) you can run it with EP-launch as with using EnergyPlus natively. Note, if you don't have a separate installation of EnergyPlus, you can use the one that is bundled with OS, where EP-launch is located in (in windows) C\Program Files\OpenStudio 1.9.0\share\openstudio\EnergyPlusV8-3-0.

Eric Ringold gravatar image Eric Ringold  ( 2015-11-23 20:10:24 -0600 )edit
1

3) Editing your idf will decouple from OpenStudio: future edits to your osm will not retain any changes in your idf. OS import of idf is limited, so you can't just import it back in, either. The best way to keep your changes and be able to make future edits in OS is to write an EnergyPlus measure to automatically make the changes to the idf after OS translates your project from .osm to .idf.

Eric Ringold gravatar image Eric Ringold  ( 2015-11-23 20:13:35 -0600 )edit
2

answered 2015-11-24 08:05:46 -0600

This question can help you.

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Much appreciated!!

SVVitale gravatar image SVVitale  ( 2015-11-24 15:04:23 -0600 )edit

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Asked: 2015-11-23 14:48:18 -0600

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Last updated: Nov 24 '15