Actually any excess velocity in the outlet will soon be converted to heat energy. The gradual decrease in velocity to zero is caused by friction between water molecules, thus converting kinetic energy to heat.
The shape of the exit nozzle affects the pump efficiency and the heating of of your pool. If the exit is too narrow, the flow velocity will be high, whith a corresponding increase in pump load. The exit will be very turbulent, since there's still plenty of power available, but will soon be converted to heat energy. If the exit is gently flared, like the shape of a draught tube, then there will be little pressure loss. Little kinetic energy will be available for heating the water, but the pump will be more efficient and consume less power. Attaching a turbine in the exit is useless since any energy it will produce will have a corresponding increase in the pump's electrical power consumption. I think it would be better just to heat your pool directly and use an insulating cover at night to minimize heat loss, just like what Martin and Carlos recommended. EDDY CASARES <[EMAIL PROTECTED]> wrote: I have approached this idea of using the excess return pressure from the pump of my swimming pool in the following manner: Any one can verify that once you overcome the friction loss in your filter and in the return pipe system, you still have quite a bit of a pressure at the discharge of each return at the pool. Well, anyone could use a portion of that pressure at the returns to run a picoturbine and perfectly generate about 200 Watts or more for 8 hours (Recommended for proper maintenance) which would be enough to help charge your battery at night as a backup to a 200 Watt Photovoltaic System for instance. This method is used in industry as an energy recovery in Reverse Osmosis where high pressure of the reject flow is conveyed to a Pelton Turbine. Eddy J. Casares Gulf Atlantic International Corporation 13322 N.W. 1 Terrace, Miami, FL 33182 Tel: 305-229-5222 Fax: 305-229-9004 E-Mail: [EMAIL PROTECTED] ==================================================== ----- Original Message ----- From: "EDDY CASARES" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Friday, September 16, 2005 2:01 PM Subject: Re: [microhydro] Reaction Turbine System for Home > I have approached this idea of using the excess return pressure from the > pump of my swimming pool in the following manner: > > Any one can verify that once you overcome the friction loss in your filter > and in the return pipe system, you still have quite a bit of a pressure at > the discharge of each return at the pool. > > Well, anyone could use a portion of that pressure at the returns to run a > picoturbine and perfectly generate about 200 Watts or more for 8 hours > (Recommended for proper maintenance) which would be enough to help charge > your battery at night as a backup to a 200 Watt Photovoltaic System for > instance. > > This method is used in industry as an energy recovery in Reverse Osmosis > where high pressure of the reject flow is conveyed to a Pelton Turbine. > > Eddy > > > > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Friday, September 16, 2005 6:40 AM > Subject: Re: [microhydro] Reaction Turbine System for Home > > > > Thanks for responding Michael! I have a 30,000 gallon pool and, according > to > > the manufacturer, the water should be circulated 6-8 times a day through > the > > filter (minimum of 8 hours). I really don't know how much power that could > > generate. As it is now, the electric pump only circulates the water. Thank > you. > > > > Steve > > > > > > [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! 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