PEMFC Model in Fluent - Effect of temperature

Rui_27 · November 29, 2018, 06:19

Hello to all,

I am using the add-on module "PEMFC Model" (the new addon made available in version 17, not the "Fuel Cell and Electrolysis Model") to simulate a PEM fuel cell.

All the results that I obtained so far are in accordance with the expected, except the effect of temperature on the cell performance: the cell performance decreases when I increase the temperature (but it should increase with temperature).

I am setting the model as indicated in the youtube tutorial on how to use this module (https://www.youtube.com/watch?v=ajZ-tc1CQDY)

When I change the temperature (in the mass flow inlets, pressure outlets and terminals), I also change the mass flow rates and species mass fraction accordingly.

Is there anyone using this module that also faced this issue?

Thank you.

Rui

Rui_27 · February 14, 2019, 05:30

For those facing the same issue:

The inconsistent results regarding the effect of temperature are due to the default value assigned to the "Activation Energy for J_ref" for the cathode. The default value in Fluent is set to 8314340 J/kmol, but the real value is actually 66000000 J/kmol (see pag. 38 in the book: Barbir, F., PEM Fuel Cells: Theory and Practice. second ed. 2013: Academic Press.).

Best regards,
Rui

Alamir · March 10, 2021, 11:02

Quote:

Originally Posted by Rui_27

For those facing the same issue:

The inconsistent results regarding the effect of temperature are due to the default value assigned to the "Activation Energy for J_ref" for the cathode. The default value in Fluent is set to 8314340 J/kmol, but the real value is actually 66000000 J/kmol (see pag. 38 in the book: Barbir, F., PEM Fuel Cells: Theory and Practice. second ed. 2013: Academic Press.).

Best regards,
Rui

how to get the details of contents of source equation and udm

pakk · March 10, 2021, 13:07

I don't understand what you are trying to ask. Which details?

Alamir · March 13, 2021, 05:47

Quote:

Originally Posted by pakk

I don't understand what you are trying to ask. Which details?

where is the default value of Activation Energy for J_ref ?
How can I see the c-code of default source terms and UDS flux, UDM that is existed in udf of PEM_user.c?

AlexanderZ · March 17, 2021, 21:27

all available information is inside files:
pemfc_user.c
pemfc.h

located in
\ANSYS Inc\vxxx\fluent\fluentxx.x.x\addons\pemfc\src
by default

November 29, 2018, 06:19	PEMFC Model in Fluent - Effect of temperature	#1
Rui_27 Member Join Date: Jul 2014 Location: Portugal Posts: 36 Rep Power: 11	Hello to all, I am using the add-on module "PEMFC Model" (the new addon made available in version 17, not the "Fuel Cell and Electrolysis Model") to simulate a PEM fuel cell. All the results that I obtained so far are in accordance with the expected, except the effect of temperature on the cell performance: the cell performance decreases when I increase the temperature (but it should increase with temperature). I am setting the model as indicated in the youtube tutorial on how to use this module (https://www.youtube.com/watch?v=ajZ-tc1CQDY) When I change the temperature (in the mass flow inlets, pressure outlets and terminals), I also change the mass flow rates and species mass fraction accordingly. Is there anyone using this module that also faced this issue? Thank you. Rui

February 14, 2019, 05:30		#2
Rui_27 Member Join Date: Jul 2014 Location: Portugal Posts: 36 Rep Power: 11	For those facing the same issue: The inconsistent results regarding the effect of temperature are due to the default value assigned to the "Activation Energy for J_ref" for the cathode. The default value in Fluent is set to 8314340 J/kmol, but the real value is actually 66000000 J/kmol (see pag. 38 in the book: Barbir, F., PEM Fuel Cells: Theory and Practice. second ed. 2013: Academic Press.). Best regards, Rui ramakant likes this. Last edited by Rui_27; February 14, 2019 at 06:32.

March 10, 2021, 13:07		#4
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	I don't understand what you are trying to ask. Which details? __________________ "The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform" is NOT the error after compiling. It is the error after loading. To see compiler errors, look at your screen after you click "build".

March 17, 2021, 21:27		#6
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	all available information is inside files: pemfc_user.c pemfc.h located in \ANSYS Inc\vxxx\fluent\fluentxx.x.x\addons\pemfc\src by default __________________ best regards ****************************** press LIKE if this message was helpful

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