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Re: [EnergyPlus_Support] concrete core conditioning + latent heat storage material
I am not 100% sure what to tell you at this time. If you want to look a little more at the solution methods, the conduction finite difference description is on page 24 of the EngineeringReference.pdf documentation. I was hoping to find a reference, for say validation of the method in E+, but I couldn't find any in that section. I will try to look further into this, as one of my current projects relies on this method.
Edwin Lee
Masters Candidate-Oklahoma State University
----- Original Message ----
From: wei xiao <basill_xw@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Thursday, June 14, 2007 8:55:56 AM
Subject: 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@yahoo. com> 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/temperatur e 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@ ise.fraunhofer. de>
To: EnergyPlus_Support@ yahoogroups. com
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@ ise.fraunhofer. de
http://www.ise. fraunhofer. de
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