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Knut Erik<br>
I would imagine that your adjacent window is a virtual window, there
only to provide you with the ability to set a shading factor when the
screen is pulled across. If that is the case, I would leave the
convective coefficients for the window alone whether the screen is
pulled or not. I would, however, define a coupling air flow through the
window and set its value differently when the screen is open and when
it is closed. Make sure that you transfer approximately the same amount
of air in both directions (up and down through the virtual window)
Knowing what value to pick for the coupling air flow is difficult.
Ideally you would use one of the airflow models coupled with the Type56
building in order to assess it (COMIS, CONTAM, or TRNFLOW). However,
this isn't an ideal solution either because those bulk air flow models
base their flow on temperature and pressure differences. In the case of
a large horizontal opening, this means that flow can only go one
direction at a time, which has a tendency to over pressurize either the
zone above or the zone below and cause convergence problems. The most
correct solution is to do some CFD work and learn what the net transfer
of air through the opening is. If that is outside the scope of what you
are doing, I would pick a fairly high air change rate (5ach/h?) and
apply that as the coupling flow when the screen is open.<br>
Best,<br>
David<br>
<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:knut.erik.enerstvedt@niva.no">knut.erik.enerstvedt@niva.no</a> wrote:
<blockquote
cite="mid:OF2D1AA29D.43FDCBBE-ONC125766C.0049FC46-C125766C.004DC491@niva.no"
type="cite"><br>
<font face="sans-serif" size="2">Hello,</font>
<br>
<br>
<font face="sans-serif" size="2">I have an ADJACENT window (with
shading)
between two Type 56 zones to model a controlled screen which can be
either
pulled across or pulled away. Does anybody know what the convective
heat
transfer coefficients of the window should be when the screen is pulled
away (that is, when the window is "gone" and there is just a
large opening between the zones)?</font>
<br>
<br>
<font face="sans-serif" size="2">All help is higly appreciated.</font>
<br>
<br>
<font face="sans-serif" size="2">Regards,</font>
<br>
<font face="sans-serif" size="2">Knut Erik Enerstvedt <br>
------------------------------------------------------------------------------------------------------------<br>
Meld deg på vårt nyhetsbrev på </font><a moz-do-not-send="true"
href="www.niva.no"><font face="sans-serif" size="2">www.niva.no</font></a>
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