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temperature or flow rate of nodes

asked 2019-12-05 13:22:27 -0500

updated 2020-01-07 17:04:04 -0500

In the OpenStudio, one way to get the a property of a node is to know where is it (for example chiller outlet) and make it in variable output tab ON. But each node has its own name. How can I get hourly state of the desired node in OpenStudio?

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answered 2019-12-05 15:26:30 -0500

updated 2019-12-05 15:27:33 -0500

Enabling Output:Variables on the Variables tab of OpenStudio does not allow you to request a specific Key Value (i.e. the specific name of the node you want in this case, cf E+ I/O reference Guide here), so you end up with all nodes being reported, but that includes the one you want. (By clicking on the chiller outlet node (or any other node) in OpenStudio on the HVAC tab you see its actual name in the right pane).

If you want to avoid having all nodes being reported, you'll need to use the ruby bindings or an OpenStudio Measure, for eg:

(disclaimer: I'm the author of the last two)

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Thanks, That's very helpful.

Mehrdad Vojdani's avatar Mehrdad Vojdani  ( 2019-12-06 02:48:40 -0500 )edit

@Julien Marrec how can I find the results for the first measure that you mentioned? I checked Data Viewer and there was no sign of requested node.

Mehrdad Vojdani's avatar Mehrdad Vojdani  ( 2019-12-06 04:26:54 -0500 )edit

What input did you provide to the measure? It should be viewable in DView if the variable actually exists (and the KeyValue is correct). You can check the companion directory, under ./run/eplusout.rdd to get a full list of output variables that apply to your model. (You can access that directly on the Run tab by click top right button "Show Simulation", otherwise companion directory means if your model is named my_model.osm, the folder next to it named my_model)

Julien Marrec's avatar Julien Marrec  ( 2019-12-06 07:16:26 -0500 )edit

I think that I used the measure in the wrong way. I entered node name as input and left key value to *! In my example, the node name is "Clg Coil Outlet Air Node".

Mehrdad Vojdani's avatar Mehrdad Vojdani  ( 2019-12-06 07:26:03 -0500 )edit

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Asked: 2019-12-05 13:22:27 -0500

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Last updated: Dec 05 '19