<HTML><BODY>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" <h.b.awbi@reading.ac.uk> An: "Achim.geissler" <achim.geissler@intergga.ch> Cc: esp-r@lists.strath.ac.uk, "FrancescoFrontini" <francesco.frontini@polimi.it> ! Betreff: RE: [esp-r] Re: PCM models Datum: 02/02/11 21:32  <div class="WordSection1"> 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 <a href="http://www.reading.ac.uk/tsbe/">http://www.reading.ac.uk/tsbe/</a>     <div> <div style="border-width: 1pt medium medium; border-style: solid none none; border-color: #b5c4df -moz-use-text-color -moz-use-text-color; padding: 3pt 0cm 0cm"> From: esp-r-bounces@lists.strath.ac.uk [mailto:esp-r-bounces@lists.strath.ac.uk] On Behalf Of Achim.geissler Sent: 02 February 2011 13:38 To: FrancescoFrontini; esp-r@lists.strath.ac.uk Subject: [esp-r] Re: PCM models </div> </div>   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 intere! sting, which model was used ... ;o) Best Achim --------- Original-Nachricht -------- Von: "Francesco Frontini" <francesco.frontini@polimi.it> An: "esp-r@lists.strath.ac.uk" <esp-r@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 <br! /> -- 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: <a href="mailto:francesco.frontini@ise.fraunhofer.de">francesco.frontini@ise.fraunhofer.de</a> @2: <a href="mailto:francesco.frontini@polimi.it">francesco.frontini@polimi.it</a> ---------------------------------------- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or enti! ties other ! than the intended recipient is prohibited. If you receive this in error, please contact the sender and delete the material from any computer. _______________________________________________ esp-r mailing list <a href="mailto:esp-r@lists.strath.ac.uk">esp-r@lists.strath.ac.uk</a> <a href="http://lists.strath.ac.uk/mailman/listinfo/esp-r" target="_blank">http://lists.strath.ac.uk/mailman/listinfo/esp-r</a> </div> </BODY></HTML>