modelling 40's house retrofit: wood chip properties and initial conditions

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mbd
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modelling 40's house retrofit: wood chip properties and initial conditions

Post by mbd »

Bonjour,

i'm trying to model effect on hygrothermal performance of retrofit for a house built in the 40's with existing walls made of :

1" pine wood planks vert.
1" pine wood planks hor.
4" wood chips
1" pine wood planks hor.
1/2" pine wood planks vert.

Q 1 : i have the value of thermal conductivity of wood in the form of chips (from a old french canadian research paper comparing "modern" insulation to traditional!), but i cannot find wood chips "wall insulation" moisture related data. i'm wondering how similar the properties of wood and wood chips are. do you know what i can use directly from wood datas and where i could get other datas or how i can estimate it?

Q 2: default initial conditions are set to 80% RH in the sofware. when i run a simulation using those conditions i have to wait more than 6 years before to get lower and steady (at least!) RH conditions over one year. is this time lapse normal? if i start the simulation at 50% RH than it goes up!?! What initial conditions would be the more appropriate in this case?

thank you in advance for your help

marianne
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