MECH 213 - 9.3.07

MECH 213 - 9.3.07 - MECH 213 September 3 2007 First Law of...

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MECH 213 – September 3, 2007 First Law of Thermodynamics – energy cannot be created nor destroyed (conservation of energy) E in – E out = ΔE sys magnitudes (aka absolute values) Ways to bring energy into a system o Heat Transfer – (Q) any energy crossing the system boundary due to a temperature difference o Work Transfer – (W) any energy crossing the system boundary not due to a temperature difference o Mass Transfer – (me) any energy that leaves the system with the mass o (Q in – Q out ) + (W in – W out ) + (me in – me out ) = ΔE sys o (Q in – Q out ) + (W in – W out ) + (m[p/ρ + u + ke + pe] in - m[p/ρ + u + ke + pe] out ) = (u 2 – u 1 + ke 2 – ke 1 + pe 2 – pe 1 ) sys flow energy – energy needed to force energy out of a system closed system that is stationary (Q in – Q out ) + (W in – W out ) = m sys Δu cycle – end at the same state at which we began if in a PV-diagram two indepenedent, intensive properties remain the same at the
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MECH 213 - 9.3.07 - MECH 213 September 3 2007 First Law of...

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