Ventilated Attic Space

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sfenton
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Ventilated Attic Space

Post by sfenton » Tue Aug 24, 2021 5:45 am -1100

Hello All

I am modelling the thermal upgrade of a flat ceiling, to a large attic space above. Does anyone have any references or thoughts on modelling the external condition on the ceiling i.e. the attic? Simply adding a surface resistance does not account for the extremely high temperatures and humidity that that can occur in these spaces

Any thoughts welcome!

Christian Bludau
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Re: Ventilated Attic Space

Post by Christian Bludau » Mon Sep 13, 2021 11:05 pm -1100

Hi sfenton,

simplest way would be to use outdoor climate with a temperature shift.
We performed research on this topic some time ago, but this is only published in German up to now. There a model for non-ventilated attics was developed.

Nebenraum-Klimamodell für unbeheizte Dachräume: https://wufi.de/de/wp-content/uploads/sites/9/555.pdf
Energieoptimiertes Bauen Klima- und Oberflächenübergangsbedingungen für die hygrothermische Bauteilsimulation: https://wufi.de/literatur/Zirkelbach,%2 ... gungen.pdf

Christian

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