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Re: [EnergyPlus_Support] limit to number of building surface detailed objects?



I think you might be better to use a finite element or CFD modeling tool such as Elmer or open foam and a mesh generator. This approach especially good for correlation to inferred thermography because IR is a snapshot in time with known boundary conditions. You would need the inside and outside temperatures and the info you can visually collect about the surface. Then use your 3D surface model to devise an effective conductance for your degraded insulation layer that could then be input into your 1D Energy Plus surface for time series whole building modeling.  It would be interesting to create code that could do such a thing.. (get material, construction & surface & data from E+, generate mesh, crossrefrence IR, run FE or CFD, and create effective conductance, produce material, construction & surface & data for E+)


Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
www.phasechange.com 
  






On Sun, Dec 2, 2012 at 10:08 AM, Edward G. Lyon <eglyon@xxxxxxx> wrote:
 

It has been my sad experience that Open Studio loses surfaces when you reopen files.  Makes it hard to not finish a model in one sitting and making modifications is impossible.  It does not seem to be an issue of the number of surfaces.  This is a question for the Open Studio group.

 

Ned Lyon, P.E. (MA)
Staff Consultant

SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct 
781.907.9009 fax
www.sgh.com

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Joe
Sent: Sunday, December 02, 2012 11:19 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] limit to number of building surface detailed objects?

 

 

Hi

Does anyone know if there is a limit to the number of building surface detailed objects that one can have in a model?

In the UK there is a strong drive by the Government for domestic buildings with unfilled cavity wall constructions to be filled. This in order to bring energy efficiencies up and CO2 emissions down. However, there is thermal imagery evidence to suggest that practice with these retrofits has been far from perfect showing a number of failure patterns across a range of buildings.

I've tried to create a 20mm mesh on the external walls of some simple buildings (using the Google Sketchup interface for OpenStudio with the intention of then writing some C# code if the initial results were interesting), and then defining constructions with differing amounts of insulation reflecting the effectiveness of the practice... BUT a good number of my meshed objects seem to disappear as I save the file and re-open it.

Has anyone else had a similar experience with either EP or OpenStudio?

best
j.




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