Micro Hydro Systems vary in size and production from a few watts to several megawatts (MW).
Hydropower is based on simple concepts. Moving water turns a turbine, the turbine spins a generator, and electricity is produced. Many other components may be in a system, but it all begins with the energy already within the moving water.
The amount of energy that can be harvested depends entirely on the site, two things are required to accurately determine the size of the system, Head is water pressure, which is created by the difference in elevation between the water intake and the turbine. Head can be expressed as vertical distance (feet or meters), or as pressure, such as pounds per square inch (psi). Net head is the pressure available at the turbine when water is flowing, which will always be less than the pressure when the water is turned off (static head), due to the friction between the water and the pipe. Pipeline diameter has an effect on net head.
Flow is water quantity, and is expressed as “volume per time,” such as gallons per minute (gpm), cubic feet per second (cfs), or liters per minute (lpm). Design flow is the maximum flow for which your hydro system is designed
Before you can begin designing your hydro system or estimating how much electricity it will produce, you´ll need to make four essential measurements:
• Head (the vertical distance between the intake and turbine)
• Flow (how much water comes down the stream)
• Pipeline (penstock) length
• Electrical transmission line length (from turbine to home or battery bank)
Head and flow are the two most important facts you need to know about your hydro site. You simply cannot move forward without these measurements. Your site’s head and flow will determine everything about your hydro system—pipeline size, turbine type, rotational speed, and generator size. Even rough cost estimates will be impossible until you’ve measured head and flow.
When measuring head and flow, keep in mind that accuracy is important. Inaccurate measurements can result in a hydro system designed to the wrong specs, and one that produces less electricity at a greater expense. Contact us for information about Micro Hydro Systems for your site.