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What does the numbers in square bracket mean?

asked 2016-02-06 19:57:00 -0500

tajjmann's avatar

updated 2016-02-07 22:22:31 -0500

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I am writing a paper and need to justify what exactly the number in the square brackets next to both roof and wall insulation in OpenStudio stand for? Could it be the R-Value for the assembly?

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A bit of context would go a long way... Where did you get these Materials that have the square brackets in the first place?

Julien Marrec's avatar Julien Marrec  ( 2016-02-07 03:37:53 -0500 )edit

Julien Marrec From OpenStudio-Construction-Materials as shown in the figures. They represent the different kinds of wall and roof insulation but i need to understand what the numbers in SQUARE bracket depict.

tajjmann's avatar tajjmann  ( 2016-02-07 20:54:18 -0500 )edit

Clearly I meant which file or library file... I opened a few yesterday (like office, midriseapartment, etc) and none had these poorly named materials. So, where did you get these materials in the first if you didn't create them?

Julien Marrec's avatar Julien Marrec  ( 2016-02-08 01:21:26 -0500 )edit

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answered 2016-02-08 08:57:51 -0500

updated 2016-02-08 11:29:37 -0500

A quick search of the OpenStudio default library osm files (located at C:\Program Files\OpenStudio 1.10.3\share\openstudio-1.10.3\OSApp) reveals that, for instance, 'Roof Insulation [18]' is the second layer material for the construction 'ASHRAE 189.1-2009 ExtRoof IEAD ClimateZone 1'. These constructions and materials were most likely created as part of the research project documented here, which states that "To model the building fabric (roofs, walls, floors, slabs, doors, vertical glazing, and skylights) recommendations in Standard 189.1-2009, we applied Tables A-1 through A-8 from the Standard to the energy models based on climate zone." Therefore, in order to validate and attribute the values of that material, the best starting point would be those tables in ASHRAE Standard 189.1-2009. It seems, though, like the number in the square bracket is an identifier only, and not related to the material properties.

@long should be able to provide more information on the Standard 189.1 study.

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Asked: 2016-02-06 19:57:00 -0500

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Last updated: Feb 08 '16