[esp-r] Re: Phase change materials properties

[Juanita Solano Guzmán]

 Hello everybody,

I am looking at line 4876 (case 2) in this code
https://github.com/ESP-rCommunity/ESP-rSource/blob/master/src/ebld/spmatl.F

I still have a couple of questions. What is labeled as "tsoli" would
correspond to the onset temperature? When looking at my crystallization
graph I have offset = 21,25°C and onset = 23,13°C. The total latent heat is
-35067 J/kg (heat out).

In that case, in line 4880 would my shtliq correspond to 35067 J/kg (with
or without the minus sign?), tsoli = 23,13°C and tmelt = 21,25°C? Is
everything multiplied times 2? also, what is the meaning of the number two
after the double " ** " in line 4880.

Thank you very much. Your help is much appreciated.

Greetings,
Juanita

Am Mo., 29. Juli 2019 um 12:42 Uhr schrieb Dariusz Heim <
dariusz.heim at p.lodz.pl>:

> Dear Juanita,
>
> The displayed unit for thermal conductivity should be W/(m^2K).
>
> The detailed explanation about "a" and "b" you can find below:
> https://github.com/ESP-rCommunity/ESP-rSource/blob/master/src/ebld/spmatl.F
> line 4876 (case 2).
>
> Good luck,
> Darek
>
>
> W dniu 29.07.2019 o 09:48, Juanita Solano Guzmán pisze:
>
> 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
>
>
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