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<p>Dear Adnan,</p>
<p>Though your paper is interesting and innovative, it does not
answer to my questions. Indeed my problem is more about the
process within TRNSYS than establishing the CHTC.</p>
<p>Again my concern is about the use of the CHTC. It seems that
TRNSYS calculates another CHTC in order to get a HCONV. I would
like to know the relationship between both and also why Req is
close to zero, while I set up a high CHTC.</p>
<p>Hopefully someone has the answer.<br>
</p>
<pre class="moz-signature" cols="72">Wirich FREPPEL
Ingenieur Doctorant en Recherche & Developpement
Centre R&D de Noirot - Groupe Muller
8 rue Louis Ampere, 02030 Laon
+33 (0)3 23 27 31 99</pre>
<div class="moz-cite-prefix">Le 01/03/2018 à 03:33, adnan rasheed
via TRNSYS-users a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAG9tXZhBy7HB2=_1C7ZD7Le6Dw3Jx1Wi4DMZG9i+2PJaQK_gRw@mail.gmail.com">
<div dir="ltr"><font style="background-color:rgb(255,255,255)"
face="georgia, serif">Dear <font color="#000000">
<span
style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Wirich
FREPPEL,</span></font></font>
<div><span
style="color:rgb(136,136,136);font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline;background-color:rgb(255,255,255)"><font
face="georgia, serif"><br>
</font></span></div>
<div><span
style="text-align:start;text-indent:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline;background-color:rgb(255,255,255)"><font
style="" color="#000000"><font style="" face="georgia,
serif">
<span
style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;text-align:start;text-indent:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Recently</span>
i did some work related to internal and external
convective heat transfer coefficient and its effect on
temperature and Overall heat transfer coefficient you
can read the model calibration section of the following
paper "</font><span
style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px;font-family:georgia,serif">Development
of a model to calculate the overall heat transfer
coefficient of greenhouse covers" </span><font
style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-transform:none;white-space:normal;word-spacing:0px"
face="georgia, serif">. Hope this will help you.if you
have any question you are most welcome.</font></font></span></div>
<div><span
style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline;background-color:rgb(255,255,255)"><font
color="#000000"><font style="" face="georgia, serif"><br>
</font></font></span></div>
<div><span
style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline;background-color:rgb(255,255,255)"><font
color="#000000"><font style="" face="georgia, serif">here
is the link of the paper</font></font></span></div>
<div><span
style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline;background-color:rgb(255,255,255)"><font
face="georgia, serif" color="#000000"> </font></span></div>
<div><span
style="text-align:start;text-indent:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><font
style="background-color:rgb(255,255,255)" face="georgia,
serif" color="#000000"><a
href="http://revistas.inia.es/index.php/sjar/article/view/10777/3790"
moz-do-not-send="true">http://revistas.inia.es/index.php/sjar/article/view/10777/3790</a></font><br>
</span></div>
<div><span
style="text-align:start;text-indent:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><font
style="background-color:rgb(255,255,255)" face="georgia,
serif" color="#000000"><br>
</font></span></div>
<div><span
style="text-align:start;text-indent:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><font
style="background-color:rgb(255,255,255)" face="georgia,
serif" color="#000000"><br>
</font></span></div>
<div><span
style="text-align:start;text-indent:0px;text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><font
style="background-color:rgb(255,255,255)" face="georgia,
serif" color="#000000">Adnan Rasheed</font></span></div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Feb 28, 2018 at 11:21 PM,
Wirich FREPPEL via TRNSYS-users <span dir="ltr"><<a
href="mailto:trnsys-users@lists.onebuilding.org"
target="_blank" moz-do-not-send="true">trnsys-users@lists.onebuilding.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi
everyone,<br>
<br>
I ran 3 different simulations with TRNSYS, in which the only
parameter I changed was the convective heat transfer
coefficient CHTC (as seen in picture 1). It seems that
nothing really differ from a simulation to another, though I
tried with h=1, then h=100 (see picture 6 which shows the
airnode temperature). Then, in order to identify the
problem, I set as output the HCONV (type 108) and the
resistance between the surface and the starnode Req (type
86).<br>
<br>
Two observations :<br>
<br>
1) HCONV does not correspond to the CHTC I set in TRNBUILD
(even by dividing it by the surface area)<br>
<br>
2) Req is very close to 0. I guess that's why I observe no
real difference between each simulation.<br>
<br>
So I've got a few questions:<br>
<br>
1) What am I actually observing with HCONV?<br>
<br>
2) Why is Req close to 0 ? And what does it mean? (I assume
that when Req=0, there is no heat transfer by convection
between the surface and the airnode)<br>
<br>
Thanks in advance for the clarification<span class="HOEnZb"><font
color="#888888"><br>
<br>
-- <br>
Wirich FREPPEL<br>
Ingenieur Doctorant en Recherche & Developpement<br>
Centre R&D de Noirot - Groupe Muller<br>
8 rue Louis Ampere, 02030 Laon<br>
+33 (0)3 23 27 31 99<br>
<br>
</font></span><br>
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</blockquote>
</div>
<br>
</div>
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</blockquote>
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