Hi Mark,
As far as I am aware Thomson & Howe is the only one that has been supplying pump-as-turbine for micro-hydropower application. There are many sites in Canada with this system that have been in operation for many years. I have seen many micro-hydropower systems during my work, I am firm believer in the pump-as-turbine for micro-hydropower. However, it does have few drawbacks one needs to be aware of. Depending on the site it is cost effective and efficient. Ghanashyam -----Original Message----- From: H2MJD [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 19, 2005 1:52 PM To: [email protected] Subject: Re: [microhydro] Re: Looking for Turbine Hello , Don Scarlett: Thanks for the heads up on Thomson & Howe and "Pumps as Turbines" as a possible solution to my quest. Actually i had purchased that book entitled "Pumps as Turbines" about three years ago and spent about a year looking for the right pump(as their formulas dictated) and then proceeded to plumb it in and wired it up only to be hugely disappointed. At full flow i was supposed to get about 12 KW and only got about 3KW. I have since removed that experiment from the power house. I wish i had known about Thomson and Howe back then, i never did find out why the performance was so bad. Currently i have a 1KW pelton and a 4 KW pelton on line, both dual nozzles, both direct drive at 1850 rpm(both just a little mismatched from optimum rpm but hey, no belts to mess with) and both are induction units utility interfaced at 240 VAC 1 phase. I'm alittle leary of putting a 33KW 240 VAC 1 phase unit on line because i'm not overly confident of balancing the third phase with no previous experience of that size.....any reccomendations on schematics or books i can read up on? Again thanks for your help. Mark ----- Original Message ----- From: Donald/Elizabeth Scarlett To: [email protected] Sent: Sunday, January 16, 2005 11:48 PM Subject: [microhydro] Re: Looking for Turbine Hello, Mark Drabick: The lowest cost option for a turbine of the head and flow rate you describe may well be one or more industrial centrifugal pumps. It should be possible to match these to your site so that they can be run direct drive and operate with efficiencies well over 70%. The use of multiple pumps would be necessary if your available flow varies significantly through the year. I have had excellent results using pumps as turbines on recent projects of 25 kW and 18 kW. I purchased the pumps, suitably sized and matched to the application, through Thomson & Howe Energy Systems of Kimberley, British Columbia (250-427-4326). Regards, Don Scarlett ********** Mark: You could get one designed to your site if you want to import it from outside the country at a lower price than acquired in USA. If interested let me know The site's data you provide is good for around 33 or so KW. Some times is best to have two units in parallel to assure long term 100 % available power. Regards Nando ----- Original Message ----- From: "H2MJD" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, January 12, 2005 1:09 PM Subject: [microhydro] Looking for Turbine > > > Hey all........I was wondering if anyone out there has any leads on a turbine which would fit my site........I'm looking for a cross flow or pelton type that would run at 130 ft of head and pass up to 5 cfs.....am more than happy to refurbish a "removed from service/used" unit......thanks, Mark Drabick 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. 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