[BLDG-SIM] About coupling air flow

[Harry BOYER]

Pedro Rodrigo wrote:

>Hi all.
>I need to estimate the coupling air flow between two
>thermal zones that have a common door that is always
>opened. This air flow will be used for building
>simulations.
>How can I estimate this parameter or, at least, a mean
>value that will be accurate for the simulations?
>Thanks in advance,
>Regards,
>
>Pedro Manuel Rodrigo Cruz
>University of Jaen, Spain
>
>
>		
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Hello,

a quite old reference treating of buoyancy driven ventilation through 
indoor openings is

G.N. Walton, A computer algorithm for predicting infiltration and 
interroom airflows/, //ASHRAE Transactions/ 90,  Part 1, 1984, 601-610


The large opening is considered as two small ones on which power law 
apply, with specific parameters (exponent, height, discharge 
coefficient). It is adapated to multizone airflow modelling and allows 
the couplings with wind induced ventilation.

Another one is considering laminar airflow solved with Bernouilli equation

Van Der Maas, J.* */Air flow through large openings buildings./ 
Lausanne: International Energy Agency Annex 20 substask 2 technical 
report, LESO-PB, EPFL, 1992.


In this one, through a doorway (with usual notations), a simplified 
expression (in kg/s) is proposed

 

I remember to have check the two previous methods and that they give 
nearly same results.

CODYRUN, the simulation software I developped (in French), with airflow 
module (pressure model with Walton's model of large openings), could be 
usefull for your needs. Keep in touch if interessed.

Harry BOYER
Réunion Island University
harry.boyer at univ-reunion.fr



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