Re: [EnergyPlus_Support] MTF documentation & Moisture Balance in a wall

["Michael J. Witte" <mjwitte@xxxxxxxx>]

The current MTF algorithm is only valid for short simulation periods 
due to the non-linear nature of the moisture transport properties.  
The surfaces can store moisture, so the assumption that the fluxes 
should balance to zero is not valid.  For more details, please see 
the Engineering Reference, p. 23, "Moisture transfer material 
properties."

Mike


On 1 Jul 2003, at 12:30, Miguel Angel Pascual wrote:

> Is it available any further documentation about the MFT algorithm and
> related input-output variables?
> 
> I have been studying the moisture balance in a wall, through the
> variables: "Outside Surface Mass Flux[kg/s/m2]" and "Inside Surface
> Mass Flux[kg/s/m2]". I thought that the  integrated difference of this
> variables over a long period should be zero but I get a very large
> number (after a long period all the moisture that gets in should get
> out) . As I increase the integration period, the moisture balance in
> the wall seems to increase (it is behaving like a moisture source or
> sink in the wall).
> 
> Can anybody tell me what is it wrong?
> 
> Thanks in advance,
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
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