[Bldg-sim] Modeling Phase change materials

[Tabares Velasco, Paulo Cesar]

Hi Jeremiah,

Please see the more detailed email I just sent you. Just to make sure other members don't do repeat the work I did. I think the problem with your files is that the construction object you are putting the PCMs (Drop Ceiling) was never linked to any of the surfaces of your building (In BuildingSurface:Detailed).

Please let me know if this solves your problem.

Best,

Paulo


From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org> [ mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jeremiah Crossett
Sent: Friday, January 20, 2012 5:15 PM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] Modeling Phase change materials

Anyone have any advice on modeling phase change materials in Energy Pro, or any other SIM software/workarounds to work in any other SIM software?  I have projects in CA so Energy Pro would be nice..

My problem is Energy Plus is showing the same results when changing the enthalpy temperature input as stated bellow...

I am working on modeling phase change materials in Energy Plus, Here is an example what I am working on creating output visualization (once I get the modeling figured out) https://docs.google.com/spreadsheet/ccc?key=0Angnu5sp0FF9dFB6RlNYSkZyMW5MUTd0cmNxZGhpbnc

I ran an experiment with the generic data from the example phase change materials IDF, as well as four varieties of data configuration and bench marked them against an identical building with no phase change materials and was very disturbed at the results.

All buildings with phase change use exactly the same amount of energy!
It makes me wonder if the phase change calculations are not really using the input data, as the energy is the same kBtu for each.. Below is the graph and here are links to my analysis sheets..


 *   Output Data in question https://docs.google.com/spreadsheet/ccc?key=0Ak5Rfmjyon9idHpKQnI5ZVp5T0UxeThNTTVIcUg0aGc
The results piloted below
[cid:image001.png at 01CCD9B2.B3C303D0]

Any help or advise would be great, as I want to compare phase change products, brands and technologies but if the enthalpy temperature data does not change the outcome then that seems impossible.
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