×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Volume of hydrogen needed to power engine

 Forum Search FAQs Links MVPs

## Volume of hydrogen needed to power engine

(OP)
Hi, a friend of mine that's studying chemical engineering and I are looking at the viability of building a hydrogen powered car. We're doing our research and calculations at the moment. We've looked at some past research and he's decided on a air/hydrogen ratio of 137.33/4 because we need to keep it quite lean. I'm just trying to figure out how many moles of Hydrogen we'll need to supply to the engine per liter of engine capacity or at least how to convert the amount of gasoline that the engine uses at full throttle to the amount of moles of hydrogen we'd need to supply it with.

Thanks

### RE: Volume of hydrogen needed to power engine

Pick a car. Say it gets 30 miles/gallon. You know how many gallons of gasoline it uses. Gasoline is about 20,000 BTU/lb so you have an estimate of the total energy being released in the cylinder. H2 has a heating value of about 61,000 BTU/lb.

Energy efficiency of the two engines isn't something I know much about. I would suspect they are similar but I'm not certain. Honda has some H2 powered Civics, mostly in California. I would start by looking at their specs for mileage (in whatever units they use) and compare those to conventional gasoline powered Civics as a check to the above method.

http://www.engineeringtoolbox.com/fuels-higher-cal...

#### 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.

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

Click Here to join Eng-Tips and talk with other members!

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!