[TRNSYS-users] why the formule of mass is M=2dARo in the buffer model of moisture?

[Yujun TAO]

Dears users,
Can some one tell me why in the User guide of MultizoneBuilding -  chapiter 6.3.2.3 moisture balance - Eq. 6.3.2-113, the formule of one material's mass is M=2dARo? I think it should be M=dARo. What's 2 used for?


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