Lec 5 - Thermodynamic Cycles Thermodynamic Cycle – A...

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Lect 5 1 st Law of Thermodynamics, Energy, Cycles Kinetic Energy - The energy of mechanical motion 2 2 1 mV KE = ( ) 2 1 2 2 2 1 1 2 V V m KE KE KE - = - = Δ Potential Energy – “Stored” mechanical energy e.g. gravitational potential energy mgz PE = ( ) 1 2 1 2 z z mg PE PE PE - = - = Δ Internal Energy for a thermodynamic system is represented By the symbol U 1 2 U U U - = Δ Total Energy for a thermodynamics system PE KE U E + + = PE KE U E Δ + Δ + Δ = Δ
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The First Law of Thermodynamics and the Energy Balance There is a property of matter called Energy and Energy is conserved. The Energy Balance: W Q E E - = - 1 2 W Q U PE KE - = Δ + Δ + Δ Other forms of the Energy Balance W Q dE δ δ - = (differential form) W Q dt dE
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Unformatted text preview: Thermodynamic Cycles Thermodynamic Cycle – A sequence of processes that begins and ends at the same state Examples: Energy balance for a cycle: cycle cyccle cycle W Q E-= = Δ Power Cycle: out in cycle Q Q W-= Power cycle efficiency: (thermal efficiency) in cycle Q W = η or in out in Q Q Q-= Refrigeration and Heat Pump Cycles in out cycle Q Q W-= Refrigeration: Coefficient of performance cycle in W Q = β or in out in Q Q Q-= Heat pumps: Coefficient of performance cycle out W Q = γ or in out out Q Q Q-= β...
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