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Re: [EnergyPlus_Support] Re: Phase change material


(The current version of E+ does not model hysteresis)


â??â??
Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
â??â??
120 E. Pritchard St.  | Asheboro, NC 27203 
 â??â??
 | Mobile 503-688-8951
<http://www.phasechange.com/>www.phasechange.com 
  <http://i.imgur.com/Sldxf.jpg>




On Sat, Apr 19, 2014 at 7:24 PM, Jeremiah Crossett <<mailto:jcrossett@xxxxxxxxxxxxxxx>jcrossett@xxxxxxxxxxxxxxx> wrote:
> Vasken,
> 
> Glad you asked! For the last few months I have been working on a new object called Material Property Dual Curve that provides hysteresis modeling capabilities.  (Thought of naming it Material Property Phase Change Hysteresis, but did not due to the common understanding that PCM's that express hysteresis have poor performance)  
> Hopefully this work will be included in version 8.2, and I expect to publish a paper on it.  
> 
> I have attached my draft word doc documentation and power point on the equations used, a publication format report from a passive house project I modeled with it, and the paper by the original developer Ramprasad Chandrasekharan that was presented at last years ASHRAE summer conference. 
>  Also attached is example file derived from the commercial reference building large office that you can use to try out the hysteresis modeling capabilities. 
> You are welcome to try my custom version by downloading the package from this link: <https://www.dropbox.com/s/xoxwfxkz8iarlhm/EnergyPlusV8-8-0_JESS.zip>https://www.dropbox.com/s/xoxwfxkz8iarlhm/EnergyPlusV8-8-0_JESS.zip
>  It will automatically run my custom version from EP launch so long as you have 8.8 as the version number. However you will notice there is no EnergyPlus.exe in the folder.  In order to run this you have to use the JESS server by Yi Zhang. You can find out how to use JESS here if you are not familiar: <http://www.jeplus.org/wiki/doku.php?id=docs:ep_launch>http://www.jeplus.org/wiki/doku.php?id=docs:ep_launch
(To use JESS you have to get an account) 
> 
> 
> â??â??
Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
â??â??
120 E. Pritchard St.  | Asheboro, NC 27203 
 â??â??
 | Mobile 503-688-8951
<http://www.phasechange.com/>www.phasechange.com 
  <http://i.imgur.com/Sldxf.jpg>
> 
> 
> 
> 
> On Sat, Apr 19, 2014 at 3:06 PM, <<mailto:v.merovingian@xxxxxxxxx>v.merovingian@xxxxxxxxx> wrote:
>>  
Hello,

>> Out of curiosity, how do you deal with the hysteresis? The melting and re-solidification enthalpy curves are hardly ever the same.
>> Is there a way to tell E+ to use a certain curve when cooling and another for heating? (Assuming full phase change when changing "modes")
>> Keep me posted,
Vasken Dermardiros
Concordia University
> 




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