I see that you have come across the project that I started about 15 years ago. I came up with the idea precisely because of the problems with 'pumps as turbines. If you know your hydraulic conditions, the water is clean and nothing changes, I agree PAT is a perfectly satisfactory solution BUT in the real world the site data is usually wrong, the customers change their minds halfway through the project and the water has 'rubbish in it'. The latter is difficult to remove. The project produced a workable turbine and the concepts are embodied in a new series of turbines that I now make. Unfortunately there is a great lack of funds and investment for promoting new ideas and designs, so it has all taken rather a long time to develop. So if anyone is fed up with the blades falling out of their cross-flow, drop me a line! Regards Rupert Evans Evans Engineering UK (Powerstream) [EMAIL PROTECTED]
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: 20 January 2005 05:03 To: [email protected] Subject: [microhydro] High Specific Speed Impulse Turbines? While trying to track down information on Pump As Turbine (PAT) I ran across "High Specific Speed Impulse Turbines." NOTE: I'm just a novice with all this stuff, but isn't the issue that these folks are looking to overcome addressed for PAT by using electronic load controllers? BTW - PAT looks really great for small installations (and for long-term viability [pumps being ubiquitous]). -Mark Nagel Everett, WA This is the only info that I could find: [From http://www.extra.rdg.ac.uk/eng/energy/book/micro.html] High Specific Speed Impulse Turbines Sponsored by: EPSRC and Previously sponsored under CASE by Powerstream , Cornwall. ------------------------ Yahoo! Groups Sponsor --------------------~--> What would our lives be like without music, dance, and theater? Donate or volunteer in the arts today at Network for Good! http://us.click.yahoo.com/TzSHvD/SOnJAA/79vVAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
