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Francesca,<br>
There are numerous ways of modeling walls both within TRNSYS and
beyond the components that TRNSYS offers. I think it would be worth
informing yourself about those modeling methods so that you can
apply your data to the most appropriate of them. The simplest wall
model accounts only for the wall's thermal resistance and discounts
the wall's ability to store energy. It would be relatively easy to
use simple equations to tune such a wall model's transmittance
(thermal resistance) to match your data. You would not even need a
Type. I don't think you'd get a very good fit for your data,
however, because walls do have thermal mass. <br>
You could use a generic lumped capacitance model such as Type963
in the TESS Loads and Structures library in order to account for the
thermal mass of the wall as well as its transmittance. However, with
such a model you would be discounting where in the wall the mass is
located (i.e. the fact that most walls are made up of different
layers whose material properties can differ significantly from one
to the next.<br>
Type56 uses a conduction transfer function coefficient wall model.
Applying your data to such a wall model and backing out the CTF
coefficients would be an interesting and non trivial research
project in itself.<br>
Beyond the CTF wall model there are also finite difference wall
models and I am sure others of which I am unaware.<br>
regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 4/21/2015 4:33 AM, Francesca
Pagliaro wrote:<br>
</div>
<blockquote
cite="mid:CAPUkA6qj=bJpH6PvQp08R-E+cDsF6HdUFFgbKRV03W6rQQ0KzQ@mail.gmail.com"
type="cite">
<div dir="ltr">Thank you Jing for your answer. I'm actually trying
to solve an unsteady calculation and compare the results with
experimental data, therefore I'd prefer a type where the
equation is already inside.</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2015-04-20 21:59 GMT+02:00 Jing Hong <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:hongjing.shirley@gmail.com" target="_blank">hongjing.shirley@gmail.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div>
<div>Francesca,<br>
<br>
</div>
If you are just going to make a simple calculation, you
may try TYPE 9 as data input, insert equation for
calculation and add a printer to get output.<br>
<br>
</div>
Jing<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">
<div>
<div class="h5">On Mon, Apr 20, 2015 at 9:33 AM,
Francesca Pagliaro <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:francesca.pagl@gmail.com"
target="_blank">francesca.pagl@gmail.com</a>></span>
wrote:<br>
</div>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div class="h5">
<div dir="ltr">
<p class="MsoNormal"><a moz-do-not-send="true"
name="14cd86a907c9806c_14cd73ff76dc9f90_OLE_LINK2"></a><span
lang="EN-US">Hello
Trnsys users, I’m trying to solve an inverse
problem related to wall transmittance.
Is it possible to calculate the
transmittance of a wall setting
in Trnsys only the external and internal
input such
as heat flux, temperature, area, on the two
sides of the wall? If yes, how?</span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks</span></p>
<p class="MsoNormal"><span lang="EN-US"><br>
</span></p>
<p class="MsoNormal"><span lang="EN-US">Best
regards</span></p>
<span><font color="#888888">
<p class="MsoNormal"><span lang="EN-US"><br>
</span></p>
<p class="MsoNormal"><span lang="EN-US">Francesca</span></p>
</font></span></div>
<br>
</div>
</div>
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<br clear="all">
<br>
-- <br>
<div>
<div dir="ltr">
<div>Doctoral Student</div>
<div> </div>
<div>University of Wisconsin-Milwaukee</div>
<div>School of Architecture and Urban Planning</div>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
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