[esp-r] Re: Phase change materials properties

[Juanita Solano Guzmán]

Thank you everybody for your help. I´ll post the PCM properties I use in my
simulation once I have a calibrated and validated model.

Best regards,
Juanita

Am Di., 30. Juli 2019 um 00:08 Uhr schrieb dariusz.heim <
dariusz.heim at p.lodz.pl>:

> 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)!
>
>
>
> Best
>
> Achim
>
>
>
>
>
> *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.de
> *Sent:* 29 July 2019 16:18
> *To:* 'Juanita Solano Guzmán' <juanita.solano94 at gmail.com>;
> esp-r at lists.strath.ac.uk
> *Subject:* [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 Guzmán
> *Sent:* 29 July 2019 09:49
> *To:* esp-r at lists.strath.ac.uk
> *Subject:* [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 temperature
>
> To - 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
>
>
> <http://www.p.lodz.pl>
>
>
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