[esp-r] Re: Phase change materials properties

[Adam Wills]

Hello Everyone,

Just so you are all aware, the ESP-r source code on GitHub is now a year out of date and is no longer maintained. The official releases are uploaded here: http://www.esru.strath.ac.uk/Downloads/downloads.htm#ESP-r

Cheers,

Adam


On Wed., Jul. 31, 2019, 03:31 Juanita Solano Guzmán, <juanita.solano94 at gmail.com<mailto:juanita.solano94 at gmail.com>> wrote:
[External Email]
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<mailto: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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