4. Water vapor transfer index (WHTI)
We have just characterized the physical quantities that define the hygrothermal state of humid air in time (at a given instant) and space.
In other words, it corresponds to a static state of humid air in a given environment.
What happens when a construction element separates two different hygrothermal environments?
4.1 Fick's Law
Consider a homogeneous wall separating two environments in which temperatures T1 and T2 are equal: T1 = T2, but where HR1 and HR2 are different, HR1 > HR2 (figure 11).
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Water vapor transfer index (WHTI)
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