[esp-r] Re: PCM models

[Achim.geissler]

Dear Hazim

very interesting paper. One question I could not see answered, though: The
measurements of heat flux will include a long wave radiative part, won't
they? The equations you give (Table 2) are convective, only. As the various
surfaces of the test chamber did not seem to have the same temperature,
there will have been a long wave exchange component, also. Did you check on
its possible magnitude?

Adding an additional approach for "convective heat transfer for PCM" would
be straightforward in ESP-r. Do you have a suggestion as to its
theoretical/equation-wise description?

Thanks.

Best
Achim



--------- Original-Nachricht --------
 Von: "Hazim B. Awbi" 
 An: "Achim.geissler" 
 Cc: esp-r at lists.strath.ac.uk, "FrancescoFrontini" 
 Betreff: RE: [esp-r] Re: PCM models
 Datum: 02/02/11 21:32
 
        Dear Achim and others   We measured heat transfer coefficients for
PCM boards on a wall under controlled conditions in an environmental test
chamber. This data is available in the  2009 Building & Environment paper
“Performance of phase change material boards under natural convection
by Liu & Awbi, Vol. 44, pp1788-1793”.   Regards, Hazim   ~~~~~~~~~~~~~
Professor Hazim B. Awbi Director Technologies for Sustainable Built
Environments Centre JJ Thompson Building  University of Reading  Reading RG6
6AF  UK  Tel: +44 (0) 118 378 6786  Fax: +44 (0) 118 931 4316
http://www.reading.ac.uk/tsbe/ (http://www.reading.ac.uk/tsbe/)       From:
esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk]
On Behalf Of Achim.geissler
 Sent: 02 February 2011 13:38
 To: FrancescoFrontini; esp-r at lists.strath.ac.uk
 Subject: [esp-r] Re: PCM models     Dear Francesco
 
 the model you are (probably) referring to is part of the development_branch
(and has been for some time) and so should be available in the official
version. It is type "SPMCMP56" and covers the topics you mention. The model
is loosely based on the PhD thesis  of Sabine Hoffmann, University of
Weimar, September 2006. Tests done with the significantly enhanced model
showed quite good results for the PCM material used at that time.
 
 What was / is tricky is finding a good set of coefficients for the
functions used for describing melting and solidification behaviour. At the
time, this was done via a MathCAD sheet which may still be available.
 
 There are others on the list also involved. Maybe they can/will tune in.
 
 By the way, rumor has it, that ISE did extensive simulations recently with
PCMs in curtain walls or better HVAC in curtain walls. It would be
interesting, which model was used ... ;o)
 
 Best
 Achim
 
 
 --------- Original-Nachricht --------
 Von: "Francesco Frontini" 
 An: "esp-r at lists.strath.ac.uk" 
 Betreff: [esp-r] PCM models
 Datum: 02/02/11 10:20
 
 Dear all,
 we are looking for a Phase Change Material PCM model for ESP-r which
 include the under cooling effect during the solidification process.
 To be a bit more detailed we have to model a PCM from DeltaCool which
 has two different curves for the solidification state and for the
 melting state. The two capacity peaks differ by 3K.
 We heard that there already some new PCM models available (not just
 the Heim model) but they are not available yet in the actual release..
 Any suggestion? How we can access them?
 
 Best regards
 
 Francesco and Tobias
 
 
 -- 
 Dr. Francesco Frontini, MEng ! PhD in Buildings Engineering
 
 ----------------------------------------
 Fraunhofer Institut für Solare Energiesysteme ISE
 Heidenhofstr. 2, 79110 Freiburg, Germany
 
 M1:    [+39] 333-3097826
 M2:    [+49] (0)1522-1624691
 
 Phone: [+49] (0)7614588-5358
 FAX:   [+49] (0)7614588-9358
 
 @1: francesco.frontini at ise.fraunhofer.de
(mailto:francesco.frontini at ise.fraunhofer.de)
 @2: francesco.frontini at polimi.it (mailto:francesco.frontini at polimi.it)
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