Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

First law on fuel cell

First law on fuel cell

First law on fuel cell

Hello everyone. I am trying to learn EES but I am still having troubles with simple tasks.
I want to model a very very simple fuel cell to find out its operating temperature:
H2 and O2 enter my control volume at 25 °C;
Water comes out at temperature T;
Heat is dissipated and there is a power output;

What i did was:

Ph2 = 100 [kPa]
Po2 = 100 [kPa]
W_dot = 2 [kW]
watermass_dot = 1.57*10^(-4) [kg/s]
Q = watermass_dot * h_products + W_dot
T = Q / Ht + 25
Ht = 0.027 [kW/C]
h_products = enthalpy(Water, T = T-273.15, P = Po2)+(-104)+(-285830/18)

My model returns T = 2.37 K. Does anyone know where could be my mistake? (maybe I am using the Enthalpy function wrong, I don't know).
Also, when I change some parameters, like W_dot = 200 kW, EES says that the evaluation of the last line resulted in a logarithm of a number less than or equal to zero.

Thanks in advance

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close