[esp-r] Re: Phase change materials properties

[dariusz.heim]

Yes. Sorry for the wrong suggestion.Regards, Dariusz Heim 
-------- Oryginalna wiadomość --------Od: achim.geissler at intergga.ch Data: 29.07.2019  17:20  (GMT+01:00) Do: esp-r at lists.strath.ac.uk Temat: [esp-r] Re: Phase change materials properties Dear all, thermal >conductivity< should have the unit W/(m K)! BestAchim  From: esp-r-bounces at lists.strath.ac.uk <esp-r-bounces at lists.strath.ac.uk> On Behalf Of rida at rhrk.uni-kl.deSent: 29 July 2019 16:18To: 'Juanita Solano Guzmán' <juanita.solano94 at gmail.com>; esp-r at lists.strath.ac.ukSubject: [esp-r] Re: Phase change materials properties Hi Juanita, There is a unit typo in the interface where thermal conductivity should be in [W/m^2K]. 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. For the linear case: a and b represent the coefficient for the latent heat only. y: the Latent heat x: Temperature.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). The apparent heat capacity= Cpsolid + Latent(T)When T is less than Tm or greater then Ts latent is zero. 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) If you couldn’t find it I think you have to add it manually and save. Hope that help! Regards,Mohamad Rida  From: esp-r-bounces at lists.strath.ac.uk <esp-r-bounces at lists.strath.ac.uk> On Behalf Of Juanita Solano GuzmánSent: 29 July 2019 09:49To: esp-r at lists.strath.ac.ukSubject: [esp-r] Phase change materials properties Hello to All,  I am currently trying to figure out the meaning of the input values and units when defining a phase-change material.  - Melting temperature degC: no questions- Solidification temperature degC: no questions - Thermal conductivity in the solid phase J/kg: In the ESPr interface the thermal conductivity is shown to have units of J/kg, I assume this is a mistake? - Thermal conductivity in the liquid phase J/kg: same as above- Specific heat  J/kg.K: no questions- Latent heat of member a J/kg.K^2 and b J/kg.K: 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: C_eff = L/(Te-To) + Cp(T=To) L - latent heat Te - Offset temperatureTo - Onset temperature Cp - specific heat at the onset temperature  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?  Thank you in advance for your help,  Best Regards,Juanita  
 

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Politechnika Łódzka 
Lodz University of Technology 

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