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"ASHRAE Baseline" measures Guidelines

asked 2017-06-20 12:01:11 -0500

updated 2017-08-05 07:29:24 -0500

I used to have the guidelines to implement in the "design case" OS model to generate the ASHRAE baseline using the measure. Can anyone provide me the documentation for that?

Also, what if I have mixed use building to model (residence+offices)? Will this measure take care of that too?

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answered 2017-06-28 15:53:35 -0500

@Julien Marrec is correct about the stuff he wrote. I think the guidelines you are looking for are in this YouTube video about the baseline automation Measure. In general, you need to define:

  1. The Standards Space Type for each Space in the model
  2. The Standards Fenestration Type for constructions used on windows and skylights
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Finally you replied!

Harshul Singhal's avatar Harshul Singhal  ( 2017-06-28 16:13:07 -0500 )edit

answered 2017-06-27 02:50:54 -0500

updated 2017-06-27 03:01:40 -0500

I'm not 100% sure what guidelines you're referring to. In general terms, the biggest thing you need to do correctly is to use space types and define the "Standards" information for these (Standards Building Type and Standards Space Type). It'll make your life easier if you use the library files that ship with openstudio as starting points for your space types (eg: get the MidriseApartment space types for Corridor, apartment, the Large Office spaces types for Open and Closed Office, Mechanical Rooms, Stairwells, etc), that way you're sure the residential versus non residential will be taken of correctly, and the loads (LPD, etc) will be affected correctly too. Aside from that, you obviously need to specify the Proposed building HVAC system because that's going to be used for the fuel determination in the baseline.

To answer your second question, yes, the measure will take care of mixed use (Residential/non residential) as well as mixed fuel, should they pass the threshold from ASHRAE 90.1 Appendix G. It will also take care of the exceptions for Internal Loads etc.

The logic for 90.1-2010 is best described from PNNL-25130, especially section " Process for Determining the Baseline System". The Logic for other vintages of 90.1 is similar but adapted. (2007 is basically the same, 2013 is way more complex... also handles the primary/secondary daylighting zones and controls)

As far as I know, the only big thing that is currently not implemented anywhere in openstudio-standards, is the baseline fan pressure drop adjustment, because there's nowhere to define if you have MERV filters etc in the proposed model and the logic can get awfully complicated anyways. This you will need to do manually...

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@aparker would be the right person to ask for the "guidelines".

Julien Marrec's avatar Julien Marrec  ( 2017-06-27 03:01:55 -0500 )edit

answered 2017-06-27 13:14:21 -0500

I guess I should've been more clearer on this. By guideline I meant by some tags that we need to provide (for ex, "fenestration type" tags to the windows construction etc) & luckily my long-term memory worked to figure out this later.

Thanks for the answer too.

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you need to define the tags on your construction object (especially windows) so the standards script knows which type to reference.

mdahlhausen's avatar mdahlhausen  ( 2017-06-27 14:02:03 -0500 )edit

This shouldn't be an answer but a comment or an edit to the original question. Thanks. And yes, you need to define the tags for this, for exterior wall (steel frame, etc), roofs (IEAD, etc). Likewise, if you can use one of the template constructions sets as a starting point that might save you some trouble.

Julien Marrec's avatar Julien Marrec  ( 2017-06-28 02:24:30 -0500 )edit

thanks Julien. Much appreciated!

Harshul Singhal's avatar Harshul Singhal  ( 2017-07-05 11:54:12 -0500 )edit

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Asked: 2017-06-20 12:01:11 -0500

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Last updated: Jun 28 '17