[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] Energy Plus Phase change materials





Jeremiah:

I don't have enough time right now to go through all your files, but thought I'd make a recommendation.  Can you plot or otherwise mine the construction (surface and finite difference nodal) temperatures to make sure that the wall temperature actually makes it into the phase change region of your data?  I'll try to keep thinking but I am quite sure the phase change simulation works well (under the model assumptions), and once you have the input data in the right form.  I'll try to look at your data as well, but can't right now, sorry.

Good luck,
Edwin

On Fri, Jan 20, 2012 at 17:58, CleanTech Analytics <jeremiah@xxxxxxxxxxxxxxxxxxxxxx> wrote:
I am working on modeling phase change meterials in Energy Plus to model phase change materials, 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..

The results piloted below
no_change.png

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.


--
Jeremiah D. Crossett
CleanTech Analytics

This document may contain valuable information proprietary to CleanTech Analytics which is private and confidential. It may not be shared, copied, stored or transmitted in any form without the prior written consent of CleanTech Analytics





--
Jeremiah D. Crossett
CleanTech Analytics

This document may contain valuable information proprietary to CleanTech Analytics which is private and confidential. It may not be shared, copied, stored or transmitted in any form without the prior written consent of CleanTech Analytics





__._,_.___


Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.




Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___