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need plenum space type when running WSHP with DOAS measure in OS?

asked 2014-10-09 18:02:12 -0500

Nick N's avatar

updated 2017-08-05 13:19:30 -0500


I'm trying to apply a whole-building HVAC measure in Open Studio--the measure that revises the systems to "AEDG Office HVAC WSHP with DOAS." I haven't had any luck with it yet, but it's a pretty drastic measure. Two questions:

1) Does the measure pull down whatever equipment objects it needs from the BCL, or do particular libraries need to be loaded for it to succeed?

2) Do I need explicit plenum spaces (and space types) in my geometry? The description of the measure says something about plenum space types, but I'm not entirely sure what it's trying to communicate.

Many thanks for your thoughts!

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If my answer doesn't help clear things up, perhaps you can share your model. Or post the errors. The measure should be robust, but it is difficult to anticipate everything. I didn't author the measure but I had pretty close involvement so I should be able to troubleshoot.

Kyle Benne's avatar Kyle Benne  ( 2014-10-10 11:41:27 -0500 )edit

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answered 2014-10-09 20:57:02 -0500

1) The measure is self contained and there is no need for any other supporting data from the BCL.

2) If you have defined plenum spaces in the model, set the plenum space type argument of the measure to the name of the space type assigned to your plenums. In this way the measure will know which spaces are plenums and connect the associated zones up properly as opposed to turning them into conditioned zones. If your model does not have plenums then leave the argument blank.

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Thanks for the clarification. I re-ran the measure without spec'ing a plenum space type as you suggested (design currently has no plenums) and things progressed further...but still ended in cancellation. An air loop was created, but none of the thermal zones were assigned.

At this point I'd happily upload my model for a look-over. Not immediately seeing a mechanism for that here on UH, here's a link: .

I'm not opposed to assembling the system "by hand" (only 15 zones) but I'm looking for a good template to work off of, first.

Nick N's avatar Nick N  ( 2014-10-10 13:17:18 -0500 )edit

Actually...After looking through whole-building HVAC measures last night, I realized the "AEDG Radiant with DOAS" is a better precursor for this project. I tried running that measure from my base model, ran into a similar final cancellation. Here's that OSM: . This measure got farther, but not to assigning equipment to zones. I have some training material to refer to template the radiant/DOAS systems, but any insight into why these measures are cancelling on me would be wonderful - Thanks in advance!

Nick N's avatar Nick N  ( 2014-10-10 13:24:06 -0500 )edit

I'm glad you have a successful model, but I should investigate your original model to see if we need to modify the measure to increase robustness. I opened up the models you provided and it seems they are after the measure was attempted. Can you send clean versions before the measure was applied?

Kyle Benne's avatar Kyle Benne  ( 2014-10-13 09:25:48 -0500 )edit

answered 2014-10-12 13:57:25 -0500

Nick N's avatar

If my answer doesn't help clear things up, perhaps you can share your model. Or post the errors. The measure should be robust, but it is difficult to anticipate everything.

Hello, thanks again for your consideration. I re-started the process with some fresh geometry and, perhaps more importantly, a lighter set of libraries resident in the model. I had loaded the master set, and the model was over 10MB.

(As a side note, with the new lighter model, OS is far more responsive -- it had been taking 15 minutes, for instance, to open the list of downloaded measures. Could this performance boost be related to the smaller loaded library set?)

I re-ran both the AEDG radiant and AEDG WSHP measures on separate forked files, and simulations complete in both cases. So for one reason or another, I now have a workflow working - now to make the building represent something reasonable.

Thanks again for your availability--it makes all the difference. -N.

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This should rather be an edit to the original question as it does not constitute an answer.

Julien Marrec's avatar Julien Marrec  ( 2014-10-13 08:25:20 -0500 )edit

answered 2014-10-13 10:29:34 -0500

The AEDG Measures use the "Standards Building Type" and "Standards Space Type" fields of each Space Type in the model to determine what the primary program (Classroom, Gymnasium, Corridor, etc) for each space is, and, in turn, which type of system (the main system or a smaller single zone secondary system) should be assigned to that space's thermal zone. The libraries/templates of space types in the older OpenStudio versions did not have these fields. If you made the model in an older version then opened in a newer version, the model would be updated and these new optional fields would have remained empty. If these fields are empty, the Measure cannot differentiate between spaces and therefore will not assign any of the thermal zones to a system. You question indicates that the warning messages and the modeler description may be insufficient to explain how the Measure works.

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Asked: 2014-10-09 18:02:12 -0500

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Last updated: Oct 13 '14