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Large office building in EnergyPlus defined as just 3 separate floors without any wall connecting them

asked 2017-03-17 22:18:06 -0500

solarpanel_m gravatar image

updated 2017-03-18 09:01:58 -0500

I am currently running large office building simulation on EnergyPlus and I downloaded my files directly from energyplus website.

It is supposed to be 3 story building, but after running it in open studio it was just 3 separate floors without any wall connecting them together:

C:\fakepath\large office.JPG

Can anyone tell me how I can fix this problem? Or is there any other source that I can download idf file for large office buildings that does not have this problem?

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answered 2017-03-18 06:26:47 -0500

updated 2017-03-18 06:28:57 -0500

This is not a problem or a bug. The Floor in the middle is made of zones that have a multiplier of 10: that amounts to multiplying the floor itself by 10. (E+ doesn't have the concept of floor mulitplier like eQuest does for example).

This is done because it speeds up the calculation (and input), and it doesn't introduce much error. After all, if you were explicitly modeling these 10 floors, you'd notice that they have the same boundary conditions all around (there's no site shading in these files, and the altitude-related variations will be minimal over this height)

There is useful information atop the file. I downloaded the 1.4_7.2 (Version 1.4 of the Ref Bldg, E+ version 7.2) version zip from the link you provided and opened RefBldgLargeOfficePre1980_v1.4_7.2_2A_USA_TX_HOUSTON.idf

Line 7:

! Description:  12 story plus basement, office building.

If you go to Line 625, you'll find this zone, Core_mid:

    Core_mid,                !- Name
    10,                      !- Multiplier

There is also a hgh-level table for floor area and number of floors for each building type here.

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Thank you,the provided information was really helpful.

Lucy gravatar imageLucy ( 2017-03-19 21:32:06 -0500 )edit

If that solved your problem, please mark the answer as accepted so we can close the thread. Thanks @Lucy

Julien Marrec gravatar imageJulien Marrec ( 2017-03-21 17:46:07 -0500 )edit

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Asked: 2017-03-17 22:18:06 -0500

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Last updated: Mar 18