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Bezeid,<br>
Because there is not a model for a PCM material built in to the
Type56 building model, there needs to be some way for a Type that
models the PCM to interface with the rest of the building (for example
so that the inside surface of the PCM material can be part of the
radiative and convective energy balance of the thermal zone). The way
that this interaction is often achieved is to define a BOUNDARY wall in
TRNBuild/Type56. A BOUNDARY wall is a surface that interacts with the
zone on one side and has some known temperature on the other side. When
the BOUNDARY wall interfaces with an external Type (such as 204), the
temperature required by the BOUNDARY wall is the interface temperature
between the back of the BOUNDARY wall and the front of the PCM
material. Typically the way that the coupling is achieved is that
Type56 calculates the inside surface temperature (TSI) and the amount
of energy being transfered through the BOUNDARY wall into the PCM
(QCOMI and/or QCOMO). These values are passed to Type204 as inputs;
Type204 then computes the reaction of the PCM to those inputs and
calculates a new interface temperature, which is passed back to Type56
as the BOUNDARY wall's outside temperature. Iteration continues until
energy balances.<br>
Kind regards,<br>
David<br>
<br>
<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:bezeid.deddy@orange-ftgroup.com">bezeid.deddy@orange-ftgroup.com</a> wrote:
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<p><font face="Times New Roman">Hello TRNSYS Users,</font> <br>
<font face="Times New Roman">I am Deddy bezeid and I make a thesis at
the bretagne-sud university, I am a new user of TRNSYS and I encounter
problems on the TYPE204 - PCM and I already found somebody who put the
same questions with which I would like to have answers, here the
questionnaires and thank you for your assistance</font></p>
<p><font face="Times New Roman"> I want to use TRNSYS Type 204 for
the simulation of PCM layers on a building. Has anyone used this type
before? It takes forever to run an one week simulation...However the
main problem is i cannot understand the way the model simulates a PCM
layer... My questions are about the SUNSPACE example supplied into the
files package loaded : There are 2 air zones in the TRNBUILD type 56
model of this example : SunZone and BackZone. SunZone is where "PCM
wall" has been installed. So : </font></p>
<p><font face="Times New Roman">- How to make the difference if we
want "PCM layer" into all walls surfaces from SunZone, or only into
some of them?</font>
<br>
<font face="Times New Roman"> - Why the resistance of the "PCM
massless layer" created in TRNBUILD is only 0.1 m².K.h/kJ?</font>
<br>
<font face="Times New Roman"> - Why the "PCM wall" using the "PCM
massless layer" into SunZone (boundary wall calling T_PCM input)
presents a so small surface of 0.2 m²? </font></p>
<p><font face="Times New Roman">- Why QCOMI is taken from the same
"PCM Wall" (14) and not from other walls?</font>
<br>
<font face="Times New Roman"> - Do we have to change values into the
4 text external files supplied (NodeTemp.txt, Tila.txt, Ceff1.txt,
ALKU.txt) or do we only have to call their path?</font></p>
<p><font face="Times New Roman"> - Why the PCMeT (average surface
temperature of "PCM wall")calculated by type 204 is sent to the
boundary "PCM wall" input (T_PCM) into type 56 ?</font></p>
<p><font face="Times New Roman"> type 204 receives QCOMI from 0.2 m²
surface (14), and T_AIR from SunZone volume, </font>
<br>
<font face="Times New Roman">then it calculates and sends T_PCM to
boundary input for 0.2 m² surface (14)</font>
<br>
<font face="Times New Roman"> => I don't see in which way this
sequence allows modelization of PCM introduction into a wall? </font>
<br>
<font face="Times New Roman">I searched all the mailing list but i
just found the same questions..and no answers... Please help...Thanks
in advance</font> <br>
<font face="Times New Roman">Deddy bezeid</font>
</p>
<br>
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