1% Rain Leak vs 5% Rain Leak

Everything concerning hygrothermal Sources & Sinks within the assembly
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Mark Jimmy
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1% Rain Leak vs 5% Rain Leak

Post by Mark Jimmy » Fri Feb 10, 2017 3:14 am -1100

Hello,
I have a question about some simulations I am completing in WUFI-Pro. I have simulated the a wall in St. John's, Nfld. under ASHRAE Year 1 weather file.
I have placed a rain leak in the outer layer of OSB sheathing (I have created five slices of OSB , 1.3 mm, 1.3mm, 1.3mm, 3.6mm, 3.6mm) behind the WRB. I have selected 1% of driving rain as a source and also 5% of driving rain. When I export the moisture source and look at the amount of water entering the assembly it appears that for three instances during the year, the 1% driving rain fraction is giving me almost half or almost the same amount of moisture as the 5% leak. See image below for moisture source and RH of sheathing.

Image - opening image in new tab appears to work for me.

I also would like to confirm the units for the exported moisture source ?

Thank you for your consistent support.
Regards,
Mark

Manfred Kehrer
WUFI International Support Team
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Re: 1% Rain Leak vs 5% Rain Leak

Post by Manfred Kehrer » Fri Feb 10, 2017 3:34 am -1100

There may be a cut-off of the moisture source in cases where the OSB reached max. water content already. This is reported in the summary which pops ups after the calculation.
Manfred
Wiss, Janney, Elstner Associates, Inc.
Official WUFI® Collaboration Partner for USA/Canada
Enjoy WUFI® :) .... It is easy and complex.

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