Niraj,
The main objective of the paper was to validate and evaluate the capability of E+ to simulate PCM. It is clear from the information available in the paper that it was not intended for reader to replicate their test/simulation exercise.
However, if you look carefully in the paper (page 7):
"Material Property: Temperature Dep: CondFD, we adopted two kinds of phase change temperature materials,
the temperature of phase change was 40â?? and 33â??
(40â?? phase change material, recorded as 40# PCM, the latent heat was about 80000 J/kg,
33â?? phase change material, recorded as 33# PCM, thelatent heat was about
70000 J/kg),
so two kinds of envelope was adopted in simulation, namely A and B ,which were showed as table 2"
Authors mentioned latent heat values for both materials used and mass
per surface area with thickness (density of PCM= mass/(area*thickness)). However, as you mentioned there is a discrepancy between the table (it says 10 mm thickness) and what is descried in the paragraph about the thickness of PCM (says 6 mm) unless they mean the nominal thickness and actual thickness. In that case, it is better to contact the authors and get some insights.
Authors has also published their experimental results in other 2 different articles. Another article I found by authors over the internet, talks about the specific heat capacity but it is in Chinese: "Analyse on the characteristic of cooling load in light weight PCM building".
All in all, you will not be able to create the PCM temperature-enthalpy relationship with the information available from the paper because you need the specific heat capacity of PCM at solid and liquid state. However, you could contact any PCM
manufacturers for DSC data for their products. In addition, many review journal papers publish data of different PCM products.
regards,
Saleh Alsaadi
From: Niraj Poudel <nirajpoudel@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Thursday, March 22, 2012 11:20 PM
Subject: [EnergyPlus_Support] Help with a journal article on PCM + Energyplus
Hi All,
When you look for journal articles on the validation of Energyplus using Phase Change Materials, you are bound to come across the paper, "Validation of veracity on simulating the indoor temperature in PCM light weight building by energyplus." Infact, you can find it here:
http://apps1.eere.energy.gov/buildings/energyplus/energyplus_research.cfm
Now my question is, for those that have read this conference proceeding, could anyone help me understand what the author's mean by "Created 6mm thick plank materials in term of the 5 kg/m2 surface densities?" Clearly in the table they have listed it as 10 mm thick?
Secondly, in the table Material thermal characteristics, they have not provided any information on a) Specific Heat Capacity b) Density of either of the materials. I cannot glean any information on the heat capacity and density of 33#PCM and 40# PCM in the paper at all. If anyone has read this paper, I would really like to hear your thoughts on this.
I went on to the ASHRAE paper on "HEAT, AIR, AND MOISTURE CONTROL IN BUILDING ASSEMBLIES?MATERIAL PROPERTIES" and found relevant information oon the veneer and EPS, but not the PCM materials listed in the article.
Thank you for reading this post,
Sincerely yours'
Niraj Poudel
Clemson University