Re: [EnergyPlus_Support] stud wall construction

[Bereket Nigusse <nigusse_ba@xxxxxxxxx>]

For one dimensional approximation I recommend a paper by Karambakkam et al, at the following link.

Karambakkam, B.K., B. Nigusse, and J.D. Spitler. 2005. A One-dimensional Approximation for Transient Multi-dimensional Conduction Heat Transfer in Building Envelopes. Nordic Building Physics.

For stud walls, the procedure is as good as the accuracy of the U or R value of the composite or stud wall.  To capture the peak conduction gain lag it is recommended to estimate the average value of the composite layer density and specific heat.

The composite layer properties calculation can easily be implemented as a spreadsheet application.

Bereket

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From: jipp06 <jippnojunk@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Sat, February 12, 2011 3:20:19 PM
Subject: [EnergyPlus_Support] stud wall construction

 

I need help to model a framed wall construction.

I have read the "Composite Wall Construction" section of the I/O manual and cannot imagine that one is limited to the limited Dataset provided. I would like to know what definitions you are using for studed walls and your opinions on the precision.

We use double framed walls or stud walls with exterior insulation so I will need to come up with some reasonable model.

Any help would be appreciated.
Thank you.

extract from I/O manual: "For stud walls, using these composite constructions [from DATASET] will give more accurate heat flow than
you would get by manually dividing the wall into a stud section and a non-stud section. If your wallâ??s exterior or interior rouroughness or thermal, solar or visible absorptances are different from those in the data set, you can make the appropriate changes to the first material (the outside layer) or the third material (the inside layer). None of the other values should be changed."

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