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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>thermal >conductivity< should have the unit W/(m K)!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best<o:p></o:p></p><p class=MsoNormal>Achim<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> esp-r-bounces@lists.strath.ac.uk <esp-r-bounces@lists.strath.ac.uk> <b>On Behalf Of </b>rida@rhrk.uni-kl.de<br><b>Sent:</b> 29 July 2019 16:18<br><b>To:</b> 'Juanita Solano Guzmán' <juanita.solano94@gmail.com>; esp-r@lists.strath.ac.uk<br><b>Subject:</b> [esp-r] Re: Phase change materials properties<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB>Hi Juanita,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>There is a unit typo in the interface where thermal conductivity should be in [W/m^2K].<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Using the interface you can only generate the file accounts for the linear function of latent heat of PCM. Also ESP-r can handle other function to calculate the latent heat capacity including exponential but for that you need to edit the *spf file manually and change for a different type.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>For the linear case: a and b represent the coefficient for the latent heat only. y: the Latent heat x: Temperature.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>If you know the characteristic at the onset and offset you can get a and b. you have two coordinate of a linear equation (0,Tm) (Maximum latent,TS). <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>The apparent heat capacity= Cpsolid + Latent(T)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>When T is less than Tm or greater then Ts latent is zero.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Check that your *spf file is linked to the model! Open your ‘model’.cfg file and look for a line with: *spf (your special material file name) <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>If you couldn’t find it I think you have to add it manually and save.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Hope that help!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>Mohamad Rida<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b>From:</b> <a href="mailto:esp-r-bounces@lists.strath.ac.uk">esp-r-bounces@lists.strath.ac.uk</a> <<a href="mailto:esp-r-bounces@lists.strath.ac.uk">esp-r-bounces@lists.strath.ac.uk</a>> <b>On Behalf Of </b>Juanita Solano Guzmán<br><b>Sent:</b> 29 July 2019 09:49<br><b>To:</b> <a href="mailto:esp-r@lists.strath.ac.uk">esp-r@lists.strath.ac.uk</a><br><b>Subject:</b> [esp-r] Phase change materials properties<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Hello to All, <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I am currently trying to figure out the meaning of the input values and units when defining a phase-change material. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><b>- Melting temperature degC:</b> no questions<br><b>- Solidification temperature degC:</b> no questions <br><b>- Thermal conductivity in the solid phase J/kg: </b>In the ESPr interface the thermal conductivity is shown to have units of J/kg, I assume this is a mistake? <br><b>- Thermal conductivity in the liquid phase J/kg: </b>same as above<br><b>- Specific heat J/kg.K: </b>no questions<br><b>- Latent heat of member a J/kg.K^2 and b J/kg.K:</b> In a previous post I read that a and b, represent the values of a linear function y = ax + b. Woud this linear function correspond to the effective heat capacity given by:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>C_eff = L/(Te-To) + Cp(T=To)<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>L - latent heat <o:p></o:p></p></div><div><p class=MsoNormal>Te - Offset temperature<o:p></o:p></p></div><div><p class=MsoNormal>To - Onset temperature <o:p></o:p></p></div><div><p class=MsoNormal>Cp - specific heat at the onset temperature <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>in that case, would "a" be equal to L/(Te-To) and "b" to Cp(T=To)? And then "x" in the linear function corresponds to the temperature? <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thank you in advance for your help, <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Best Regards,<o:p></o:p></p></div><div><p class=MsoNormal>Juanita <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>