×
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.

# Is there an optimum load for a turbine to operate most efficiently?

## Is there an optimum load for a turbine to operate most efficiently?

(OP)
Specifically Francis turbines. I'm sure there is an ideal flow rate which gives the maximum efficiency, but if you had one flow rate to work with would there exist an ideal amount of applied load which would result in the most efficient conversion of energy? Say you kept all other things constant but changed the friction resisting the rotation of the turbine, would there be an optimal friction value that allows the maximum amount of potential and kinetic energy to be captured? Or would the most efficient design be the one with the minimum amount of friction?

### RE: Is there an optimum load for a turbine to operate most efficiently?

Minimum friction.
Yes, there will be some point of maximum efficiency. It won't be anyplace you can reasonably find and use. The electrical load point normally isn't easily moved around so the best you can do is have the load you have and run just enough water to maintain that load point which is the best efficiency at that load point.

Keith Cress
kcress - http://www.flaminsystems.com

### RE: Is there an optimum load for a turbine to operate most efficiently?

Yes, minimum friction/0 friction could do the magic of getting ideal efficiency in any machine.

But making complete system frictionless is impossible and when trying to achieve we may incur costs which may defy logic to use that turbine/system for power generation. Even if we spend money to do everything to lower down friction, there would be still some amount of friction present in system.
How can we remove the frictional losses in penstock and components mounted before water enters turbine (which reduces the input energy) and inside turbine even if we use very high surface finish components/efficient bearings (which reduce the output energy)? Even if we use air bearing, the air-friction would contribute to the loss of energy. Same thing for generator losses.

So with whatever possible economical ways we can reduce friction, that can be beneficial in achieving best possible efficiency.

#### 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.

#### Resources

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
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™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:

• 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!