[Bldg-sim] Hygrothermal properties of building materials
JRR
energy.wwind at cox.net
Sun May 17 09:06:16 PDT 2009
JRR wrote;
I have had an energy efficient house since January 1987.
It is basically a LEED Silver building with 2x6 studs, 1" Expanded
Polystyrene sheathing, fiberglass
insulation, and a 6 mil Polyethylene vapor barrier. If I were to
repeat it I would use aluminum foil
backed drywall for the vapor barrier and I would eliminate all
ceiling penetrations on the top floor
for electrical and lighting. I took 20 hours this January and hunted
down vertical air leaks in the attic.
The result was a saving of about 400 kwh per month out of 1800 kwh
annual max in January on this
4500 sq ft home.
Abdul Murad Zainal Abidin wrote:
> Hello,
>
> I am currently using energyPlus to simulate a single zone building in
> hot and humid climate. The latest version of EnergyPlus has a combined
> heat and moisture transfer (HAMT) model added. My building envelope
> has polyurethane foam as the insulating material (wall), polyethylene
> sheet as vapour barrier, cement screed and damp-proof barrier for
> floor construction. The hygrothermal properties for the said
> materials in existing publication only have permeance and
> permeability. However, those properties are not included inside the
> HAMT model for the simulation to run effectively.
>
> I would really appreciate it if someone could assist me in providing
> the hygrothermal properties of the said materials, which can be used
> in the HAMT model.
>
> Thank you for reading.
>
> Yours sincerely,
>
> Murad
> Loughborough University
>
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