lecture 35 november 20
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Lecture 35 November 20
ECEN2060Frank Barnes
Home works
• Home work, Wednesday Nov. 20th• 7.1, 7.2, 7.3, 7.4, 7.5• Home work for Monday Dec 2, 2013• 7.7,7.10,7.11, 7.12, 7.13 • Also plan on getting started on your term
paper. • Home work for chapter 8 Friday Dec 6, • 8.1,8.5.8.6, 8.8, 8.10,8.11
Energy In a Wave
• The power in a sine wave with Height H and period T
»P=•For H =3m and T=8sec •P= 70.5kW/m•Note the density of water is ρ 1,025kg/m3
32
22 THg
Systems for Extracting Energy from Waves
Variations Wave Shapes and Heights
Distributions of Wave Heights and Periods.
Wave Power Available in kWh/m/yrNear San Francisco
Wave Energy Estimates
Variations in Wave Power with Time of Year
Wave Power Results for a 1MW Generator in kW
Annual Energy MWh/yr for Site Near San Francisco
Wind and Wave Generators Colocated off Shore
Two Tidal Generators.
Tides and Position of the Moon
Variations with Time of Year
Variation of Tides
Velocity of Tidal Currents and Available Power ~ v3
• 1. Note Betz limit applies at 59.3% to the fraction of the power that can be used of the half sine wave P=(ρAVm
3)
Common Mixed Tidal Currents Over a Day
Cut In and Rated Speed
Surface Tidal Speed Probability Distribution Tacoma Narrows
Estimated Energy Delivered For a Turbine Rated at 600kW
Hydropower Run of the River
Power Plant
• 1. Potential energy from ΔH and kinetic energy from v2 energy head = z +
• Z= height P = pressure• γ= Specific Weight v = velocity • g = gravitational constant.
Power Plant
Conversion Factors
Pelton Turbine
Angle Drive Propeller Reaction Turbine
Net Head after Friction Loss
Friction Head Loss vs Flow Rate for Small Pipes
Weir For Measuring Flow
• 1. Q = 1.8 (W- 0.2h)h1.5(m3 /s)
Electrical Block Diagram for Micro Hydro System
Pumped Hydro System
Raccoon Mountain
Raccoon Mountain
Two Penstock Pumped Hydro System
Biomass Gasification Process
Geothermal Plants
Binary Geothermal System
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