Insulation has no effect on heating and cooling loads [closed]

asked 2015-05-02 13:13:50 -0500

RMAK's avatar

updated 2015-05-03 10:08:56 -0500

I carried out an energy analysis on Openstudios (model was made in Sketchup) of a 5 storey open-plan office and I changed the insulation properties of the roof and the exterior walls and ran energy analysis with the same HVAC system (Packaged Rooftop Heat Pump). I expected that I would get different heating and cooling loads because of the different insulation properties. I found that there was no change in the energy analysis. Can someone please tell me what I did wrong ? I followed everything in the tutorials found on the NREL channel on youtube.

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Closed for the following reason question is not relevant or outdated by Julien Marrec
close date 2015-09-17 16:50:01.423571


@RMAK please edit your question to use more informative tags like the software you're using so that the right people will see it and it will show up when searching by tags.

MatthewSteen's avatar MatthewSteen  ( 2015-05-02 14:25:06 -0500 )edit

@RMAK You'll need to provide more information, and probably a link to your before and after files (on DropBox or similar) for someone to be able to answer this question.

aparker's avatar aparker  ( 2015-05-02 16:36:56 -0500 )edit

@RMAK, do your zones have thermostats?

__AmirRoth__'s avatar __AmirRoth__  ( 2015-05-03 10:15:22 -0500 )edit

The link will take you to the my google drive folder which has the energy analysis runs I made for the different HVAC systems. I hope someone will be able to answer my question. It has me quite confused. Also I ran a similar analysis with Autodesk Revit just to double check and it gives the same results. There is no change in heating and cooling loads due to change in insulation !!


RMAK's avatar RMAK  ( 2015-05-04 08:28:43 -0500 )edit

@RMAK file looks private. Some other possible causes.

  • The construction you are altering is not the construction being used (just altering an unused resource)
  • Infiltration value set to way too high so trivial impact to envelope conduction
  • Other internal loads may be set way to high, again making envelope contribution hard to see.
  • If you have large error in starting envelope R value. If it is almost perfect to begin with, adding more insulation won't change much.
David Goldwasser's avatar David Goldwasser  ( 2015-05-04 10:15:34 -0500 )edit