Best Practice For Modeling DOAS with VRF in Openstudio?

asked 2016-06-02 15:31:12 -0600

Brian C's avatar

updated 2016-06-02 15:43:07 -0600

I am trying to model a VRF & DOAS w/ERV system for the first time in OpenStudio. I am running into what seems to be a common issue of having a lot of unmet hours when implementing a dedicated air system with VRF in OpenStudio.

It would be great to see how other's have done this so that I may be more confident that I modeling it as best as I can and ensure the VRF terminal units are performing the work. Any details regarding the necessary/important e+ inputs along with screenshots of layout would be helpful to see.

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Have you checked out the VRF with DOAS measure on BCL as well as the archive on this very site?

Julien Marrec's avatar Julien Marrec  ( 2016-06-02 15:42:30 -0600 )edit

@Julien Marrec Thank you for link (unable to find it previously on BCL GUI in OpenStudio Application). With the script, is there a way to further specify the DOAS and/or VRF systems that are created. For example I only need 1 DOAS for my facility (not by floor) and a VRF system that has multiple CU's not just one large CU which I think the script is creating.

Brian C's avatar Brian C  ( 2016-06-02 15:52:20 -0600 )edit

You can't really expect to find a measure that will do everything perfectly according to your specific building can you? That would be too easy (for you, incredibly complex for the person coding it) :)

The script is creating one doas per floor and one outdoor unit per floor too. It should be pretty easy to modify the script to do what you want. See the measure writing guide.

Or you can just look at how objects are setup and duplicate that manually in the OS app for your application

Julien Marrec's avatar Julien Marrec  ( 2016-06-03 04:14:04 -0600 )edit

Thanks. Your out.idf file will be helpful for me to manually create the objects in OS with your chosen parameters.

Brian C's avatar Brian C  ( 2016-06-03 12:27:10 -0600 )edit

Use the measure! If you really want to end up with an IDF file, run your model after applying the measure.

Julien Marrec's avatar Julien Marrec  ( 2016-06-03 12:29:37 -0600 )edit