I think 40000 gpm is 3 cumec, which at 1.8 metres gives about 53 kw gross or about 35 kw electrical not 150 kw. Rupert
-----Original Message----- From: Nando [mailto:[EMAIL PROTECTED] Sent: 08 March 2005 04:46 To: [email protected] Cc: [EMAIL PROTECTED] Subject: Re: [microhydro] Fwd: waste water discharge . . . Radu: Please present the calculations for you to say that there is the opportunity to get ~ 150 KW 6 feet and 40,000 GPM Regards Nando ----- Original Message ----- From: "Radu Babau - VARSPEED Hydro" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, March 07, 2005 4:01 AM Subject: Re: [microhydro] Fwd: waste water discharge . . . > > > Hello Ken, > > > A rough calculation shows the opportunity to get ~150 kW output power, using a Kaplan or propellor turbine. > > However, the discharge of a waste water plant is not always that clean > as you would like to believe. Those tiny suspension particles will make the turbine to clogg randomly, so it has to be cleaned quite often in comparison with clean water turbines. There is also higher errosion due to small metal and sand particles. This means higher general maitenance costs. One simple idea is to reverse the turbine speed once a day, using a softstarter for instance. The water turbulence would contribute to rotor cleaning, so you will have to seldom dismantle and clean it manually. > > Since you say the flow is constant, you could use a constant speed induction generator, and a fixed pitch rotor. Things with moving blades will have higher chances to get gripped by the muddy water. Please choose carefully the rotor characteristics. > > It's a feasible idea after all. There are experienced guys in the > group who could put you on the track for a good propellor supplier. The first name which crosses my mind right now is Peter Ruyter, www.cargo-kraft.se > > BR, > > Radu > > > ----- Forwarded message from Ken Carman <[EMAIL PROTECTED]> ----- > Date: Wed, 16 Feb 2005 16:48:21 -0800 (PST) > From: Ken Carman <[EMAIL PROTECTED]> > Reply-To: Ken Carman <[EMAIL PROTECTED]> > Subject: waste water discharge . . . > To: [EMAIL PROTECTED] > > Our city has a large water treatment facility with a discharge that > has a head > of 6 to 8 feet and a constant year-round flow of nearly 40,000 gpm. > Is this a > good opportunity to persue putting a turbine on or not? > > Ken [EMAIL PROTECTED] > > ----- End forwarded message ----- > > > [Non-text portions of this message have been removed] > > > > > > > > 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 > > > > > > > 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 ------------------------ 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/
