Hello Nando,
Seems that you work when I sleep and vice-versa. However, this does not bring any excuse to my bad typing skills. So, it was meant to be ~50 kW, instead of ~150 kW. Mea culpa ! BR, Radu P.S. I used UK gallon (4.54 l/gallon) in my calculation. ----- Original Message ----- From: Nando To: [email protected] Cc: [EMAIL PROTECTED] Sent: Tuesday, March 08, 2005 6:45 AM 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 ? 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