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WG: [EnergyPlus_Support] concrete core conditioning + latent heat storage materi
Hello,
Iâ??m a bit confused by reading in the archive of the newsgroup.
Thus I just ask again:
Is it possible to simulate an active PCM-system in wall constructions
with EnergyPlus?
My own tests with EnergyPlus are negative. The error-file of my
simulation reports the following
message:
Program Version,EnergyPlus 2.2.0.023, 29.05.2008 15:56,IDD_Version
2.2.0.023
** Severe ** MTF or MFD solution currently is not valid with
embedded sources/sinks
And if I use the CTF-algorithm, the PCM characteristic of the material
is not used for the calculation.
Can somebody confirm that?
Or are my simulation settings wrong?
Regards,
Arno
Von: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] Im Auftrag von wei xiao
Gesendet: Donnerstag, 14. Juni 2007 15:56
An: EnergyPlus_Support@xxxxxxxxxxxxxxx
Betreff: Re: [EnergyPlus_Support] concrete core conditioning + latent
heat storage material
hello,
I have tried to do the simulation with PCM construction through Eplus.
But I found that the two results from CTF and Condfd algorithm for the
same model house without PCMs have a big difference . So I am not sure
the Condfd algorithm in E+ is reliable. I have asked this question as
"CTF vs Condfd" in this group.I hope you can check.
Edwin Lee <leeed2001@xxxxxxxxx> wrote: Hello,
I have had a small amount of experience with the phase change
materials in E+. It is possible to model them within any other
construction. There are a few steps which must be performed. First the
solution algorithm must be changed from CTF to CondFD to turn on
Conduction Finite Difference solution scheme for the simulation. As
far as I know E+ automatically selects the number of nodes it will use
to solve the finite difference scheme for each construction. Secondly,
the materials must be defined. If I remember correctly, any phase
change material should first be defined as a regular material, and
then create a secondary material definition which is temperature
dependent, and requires enthalpy/temperature data. To get the nodal
temperature distribution within the constructions, just add the report
variable: CondFD Nodal Temperature. There will be many nodes in the
output, so be prepared for lots of data. Also, when using the CondFD
solution scheme, it is
recommended to have at least 20 timesteps/hour for the solution timestep.
Good luck!
Edwin Lee
Masters Candidate-Oklahoma State University
----- Original Message ----
From: Sebastian Dietz <sebastian.dietz@xxxxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Wednesday, June 13, 2007 7:39:57 AM
Subject: [EnergyPlus_Support] concrete core conditioning + latent heat
storage material
Hello erverybody,
I would like to know, if it is possible to model concrete core
conditioning in combination with phase chance material (at the same
construction). If yes, wich heat transfer calculation does EnergyPlus
use and is it possible to get the inside temperature of the different
layers as an output?
Thanks in advance
Sebastian
--
Sebastian Dietz
Fraunhofer-Institut for Solare Energiesysteme ISE
Heidenhofstrasse 2, 79110 Freiburg, Germany
Phone: +49 (0) 7 61/ 45 88-51 36
Sebastian.Dietz@xxxxxxxxxxxxxxxxx
http://www.ise.fraunhofer.de
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