Well the requestor is not in UK influenced land , the gallon is 3.78 liters for him, Still a bit too to high. He is American or, for many, Gringo Nando ----- Original Message ----- From: "Radu Babau - VARSPEED Hydro" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, March 08, 2005 4:14 AM Subject: Re: [microhydro] Fwd: waste water discharge . . .
> > > 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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