power1

Efficient energy conversion electrical power

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Unformatted text preview: lectrical Power Generation Waterwheels - History Waterwheels Horizontal Wheel - Greek Oldest - For Speed Vertical Wheel - Roman Newer - For Power England Became Leader (1800s) John Smeaton Powered Pre-Steam Industry Types Undershot, Breast, Overshot Waterwheels - Research Waterwheels Fluid Mechanics (1600s) Hydraulics (1700s) Parent (Late 1600s) Speed of Blades is 1/3 Speed of Water Bernoulli (1727) Pressure on Blades Proportional to Relative Pressure Velocity between Current and Blade Squared Velocity Smeaton (1952 & 1953) & Bossut Speed of Blades is 2/5 Speed of Water Waterwheels - Research Waterwheels Charles de Borda (1767) Speed of Blades is 1/2 Speed of Water Proportional to Speed of Water (Not Square) Other Considerations Diameter Width to Depth of Blade Spacing Spacing Angle Shape Waterwheels - History Waterwheels Undershot - Poncelet (1828) Curved Vanes to Reduce Power Loss Undershot - 30 % Efficient Calculated Most Efficient Arrangement Overshot Required Large Gradient Buckets Used Instead of Blades Utilized Weight of Water & Momentum Double the Efficiency of Undershot Breast - Sagebien Most Universal Design of Era Breast Wheel (Early 19th Century) Breast Poncelet’s Wheel (1828) Poncelet’s Wooden Overshot Wheel (Early 19th Century) (Early Metal Overshot Wheel (1830s) Metal Sagebien’s Wheel Sagebien’s (Middle of 19th Century)...
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