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Pedro Rodrigo wrote:
<blockquote
cite="midMDAEMON-F200602230301.AA0136265pd80001481523@gard.com"
type="cite">
<pre wrap="">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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</pre>
</blockquote>
<p class="references">Hello, <o:p></o:p></p>
<p class="references" style="margin-bottom: 12pt;">a quite old
reference treating
of buoyancy driven ventilation through indoor openings is <o:p></o:p></p>
<p class="references"><span style="" lang="EN-GB">G.N.
Walton, A computer algorithm for predicting infiltration and interroom
airflows<i>,
</i></span><i><span style="" lang="EN-US">ASHRAE
Transactions</span></i><span style="" lang="EN-US"> 90,
Part 1, 1984, 601-610</span><o:p></o:p></p>
<p class="references" style="margin-bottom: 12pt;"><br>
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. <o:p></o:p></p>
<p class="references" style="margin-bottom: 12pt;">Another one is
considering
laminar airflow solved with Bernouilli equation <o:p></o:p></p>
<p class="references"><span
style="font-size: 10pt; font-family: "Century Schoolbook SWA";"
lang="EN-GB">Van Der Maas, J</span><span
style="font-family: "Century Schoolbook SWA";" lang="EN-GB">.<b> </b><i>Air
flow through large openings buildings.</i> Lausanne: International
Energy
Agency Annex 20 substask 2 technical report, LESO-PB, EPFL, 1992.</span><o:p></o:p></p>
<p class="references"><span
style="font-family: "Century Schoolbook SWA";" lang="EN-GB"><br>
In this one, through a doorway (with usual notations), a simplified
expression
(in kg/s) is proposed</span><o:p></o:p></p>
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<p class="references">I remember to have check the two previous methods
and that
they give nearly same results. <o:p></o:p></p>
<p class="references">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. <o:p></o:p></p>
<p class="references" style="margin-bottom: 12pt;">Harry BOYER <br>
Réunion Island University<br>
<a class="moz-txt-link-abbreviated" href="mailto:harry.boyer@univ-reunion.fr">harry.boyer@univ-reunion.fr</a><o:p></o:p></p>
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