[TRNSYS-users] Type 56 - Moisture Capacitance Model (Buffer Storage Humidity Model) parameters

[Marie-Hélène via TRNSYS-users]

Hi everyone,


I’m working on a multi-zone building (type 56) model with TRNSYS18 and I
want to use the Moisture Capacitance Model (Buffer Storage Humidity Model).
To do this, I have to define 6 parameters: Ksurf, Kdeep, Msurf, Mdeep,
Bsurf and Bdeep for every thermal zone.

There are many questions about this on the mailinglist but not many
answers. I listed some questions about the *Buffer Storage Example* (TRNSYS
documentation) below :

1- When calculating Mdeep, why the thickness of every material i is not
double in the calculation of Mi as it is for the calculation of Msurf ?
(https://www.mail-archive.com/trnsys-users@engr.wisc.edu/msg01911.html)


2- When calculating Mdeep, they do consider the concrete from ceiling and
ground floor, but there's some information missing in the example to
explain Mconcrete = 175kg.  For this calculation should I use the thinkness
and area of concrete from floor and ceiling?


3- When calculating Bdeep, the value of A is 50m^2, wich is the wall/gypsum
area. Floor and ceiling area are neglected?

4- Someone know a good link or reference about this calculation?

Thank you very much,


[image: Images intégrées 1]

*Marie-Hélène Talbot* | Étudiante à la maîtrise
Énergies renouvelables et efficacité énergétique
Département de génie de la construction
École de technologie supérieure
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