[esp-r] Re: PCM Modelling

[Dariusz Heim]

Dear Mike,

The PCM model you would like to use is the simple one (without 
overcooling or overheating)
but with the linear function of latent heat flux versus temperature. 
Melting temperature should
be lower than solidification. The difference is the phase change 
temperature range.
Specific heat is taken for solid phase. Members a and b is the constants 
of linear function:
y=ax+b.

Alternatively, you can use a simpler model where latent heat flux is 
constant versus temperature.
Then, you need to know only latent heat and both temperature.

Please see also:
http://www.ibpsa.org/proceedings/BS2005/BS05_0397_402.pdf

Kind regards,
Darek

W dniu 2013-07-18 17:17, Mike Whalley pisze:
>
> Hi to All
>
> I'd like to get some help modelling PCM in the active materials 
> section of Special Components in esp-r. In particular I'd like to make 
> sure that I understand the inputs:
>
> Melting temperature -- the temperature at which the solid PCM begins 
> to melt.  I'd expect this to be lower than the solidification temperature
>
> Solidification temperature -- the temperature at which the liquid PCM 
> begins to freeze.  I'd expect this to be higher than the melting 
> temperature.
>
> Conductivity in solid phase -- self explanatory
>
> Conductivity in liquid phase -- self explanatory
>
> Specific heat -- is this taken at solid or liquid phase.
>
> Latent heat member a, latent heat member b -- I'm not sure what are 
> members a and b
>
> Do the properties above apply to the PCM or to the complete compound, 
> ie if PCM is encapsulated 50/50 in wallboard are the wallboard 
> properties entered as normal in the materials database and the PCM 
> properties in the special components file?
>
> Any help would be much appreciated
>
> *Mike Whalley **CEng MCIBSE***
>
> *Principal Director*
>
> *Building Performance Analysis Limited*
>
> *PO Box 3516*
>
> *Bath*
>
> *BA1 1ZN*
>
> **
>
> *Tel:01225 920796*
>
> *Mob:07919 993610*
>
> mike at bldgperformance.co.uk <mailto:mike at bldgperformance.co.uk>
>
> www.bldgperformance.co.uk <http://www.bldgperformance.co.uk>
>
>
>
> _______________________________________________
> esp-r mailing list
> esp-r at lists.strath.ac.uk
> http://lists.strath.ac.uk/mailman/listinfo/esp-r

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.strath.ac.uk/archives/esp-r/attachments/20130719/0b32d668/attachment.html