BRAE 312 Ch 5 - Energy

BRAE 312 Ch 5 - Energy - Hydraulics Energy ITRC Cal Poly...

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1 Hydraulic Hydraulics Energy ITRC Cal Poly Energy Background material Bernoulli Equation Adding friction and pumps Horsepo er calc lation ITRC/BRAE Cal Poly Horsepower calculation Questions
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2 FIRST LAW OF THERMODYNAMICS (CONSERVATION OF ENERGY) The first law of thermodynamics states that energy can neither be created nor destroyed. So when considering a system, all forms of energy must be accounted for within a system. ITRC/BRAE Cal Poly If done so carefully, it can be said that the total energy at one point in a system must equal the same energy at another point in that same system. Energy Kinetic Energy - Energy associated with the movement (velocity) of the fluid mass (m) KE = ½ m V 2 KE unit weigh = V 2 /2g = V 2 /64.4 (ft) ITRC/BRAE Cal Poly unit weight KE unit mass = V 2 /2 (ft 2 /s 2 )
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3 Energy Potential Energy Energy associated with location of fluid mass relative to a datum PE unit weight = z (ft above some reference point) ITRC/BRAE Cal Poly PE unit mass = gz (ft 2 /s 2 ) KE v. PE z = 20 ft V = 5 ft per sec reference = 0 ft A B ITRC/BRAE Cal Poly Calculate the KE and PE at each point Use energy per unit weight units Use energy per unit mass units
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4 Pressure Head h = P/ γ = P/( ρ g) or h = P (psi) x 2.31
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This note was uploaded on 11/18/2011 for the course BRAE 433 taught by Professor Styles during the Fall '10 term at Cal Poly.

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BRAE 312 Ch 5 - Energy - Hydraulics Energy ITRC Cal Poly...

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