[TRNSYS-users] Buffer Storage Humidity Model

[Enertech]

Dear TRNSYS Users,

I would like to model a very heavy building with one zone and I want to 
study the moisture balance of this zone. So, I’m using the Buffer Storage 
Humidity Model. I’m not sure of my parameters :

Walls are composed by (from inside to outside) :
-         20 cm of heavy concrete ;
-         14 cm of mineral wool.

The surface storage is composed by the first centimeter of concrete and the 
deep storage by the 19 other centimeters (do I thinking right ?). I have 6 
750 m² of walls. So my parameters are :

Ksurf = 0.04                Kdeep = 0.04
Msurf = 6750 m² * 0.01 m * 2 500 kg/m3 = 168 750 kg
Mdeep = 6750 m² * 0.19 m * 2500 kg/m3 = 3 206 250 kg
Bsurf = 3 kg/m²h * 6750 = 20 250 kg(air)/h
Bdeep = 1 kg/m²h * 6750 = 6750 kg(air)/h

An other possibility is to have walls composed by (from inside to outside) :
-         6 mm of Gypsum ;
-         8 cm of mineral wool ;
-         20 cm of heavy concrete.
So my parameters becomes :

Ksurf = 0.015              Kdeep = 1
Msurf = 6 750 m²* 0.006 * 900 kg/m3 = 36 450 kg ;
Mdeep = M(gypsum) * K(gypsum) + M(mineral wool) * K(mineral wool) + 
M(concrete) * K(concrete) = 36 450 * 0.015 + 6750 m² * 0.08 m * 12 kg/m3 * 
0.01 + 6750 m² * 0.20 m * 2500 kg/m3 * 0.04 = 135 612 kg
Bsurf = 3 kg/m²h * 6750 = 20 250 kg(air)/h
Bdeep = 1 kg/m²h * 6750 = 6750 kg(air)/h

Can someone tell me if I’m right ? If not, how should I do ?
Thanks a lot,
Christophe

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