Previous in Forum: Starting Current Star/Delta Starter   Next in Forum: Alternator Question
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
2 comments
Rate Comments: Nested
Anonymous Poster #1

Cooling Towers

11/15/2012 12:48 AM

We are using Vsd's on our cooling Towers.I did collect data from different speeds, and I noticed that the power ratio(P1/P2) is 2.2 and the rpm ratio(RPM1/RPM2)cubed is 5. I do believe they should be close to each other.Is this an indication that the fan blade angles are too small.
Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: Cooling towers

11/15/2012 3:13 AM

What does the manual have to say on this topic?

If the fan blade pitch is too large, then several things happen. One is that the power needed goes up. Another is the risk of spray being blown over the countryside, with attendant risk of the spread of legionella pneumophila, a common risk in towers that aren't properly managed. And if the manual isn't to hand or being disregarded, proper management is at risk.

On what basis is the belief founded?

What does the tower manufacturer have to say on the topic?

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Reply
phoenix911
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 23647
Good Answers: 420
#2

Re: Cooling Towers

11/15/2012 4:16 PM

Collect the model number and serial number on the unit, and asked the manufacturer.

You have to realize that on cooling tower, you have a base unit that is based off your requirement.

And off that base your your can change motor HP (increase), Port sizing, and I imagine pitch on the blades to run over 100% of base design. (sounds odd I know)

And by running in excise of 100% this could be extra GPM, High BTU's exchange, different temperature differentials, ect......

__________________
 “ When people get what they want, they are often surprised when they get what they deserve " - James Wood
Reply
Reply to Forum Thread
Have a Different Question?
2 comments

Previous in Forum: Starting Current Star/Delta Starter   Next in Forum: Alternator Question

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (94 right now)
Show Members
Advertisement