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Lecture 8 PES Su 2011

# Lecture 8 PES Su 2011 - ME 200 Thermodynamics I Lecture 8...

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ME 200: Thermodynamics I Lecture 8: Energy Analysis of Cycles Prof. Sojka Summer 2011

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2 In this Lecture … Energy Analysis of Cycles
3 Thermodynamic Cycle A thermodynamic cycle is a sequence of processes that begins and ends at the same state. The energy balance takes the form cycle cycle cycle W Q E - = Must be satisfied ! cycle cycle Q W =

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4 Power Cycle Power Cycles Deliver net work to the surroundings during each cycle. Thermal Efficiency out in cycle Q Q W - = out in cycle Q Q W - = in cycle Q W = η in out Q Q - = 1 η
5 Refrigeration and Heat Pump Cycles Refrigeration and Heat Pump Cycles Require net work input from the surroundings. Refrigeration Cycle Cool a refrigerated space or maintain temperature below that of the surroundings. Heat Pump Provide heating or maintain temperature above that of the surroundings. in out cycle Q Q W - =

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6 Refrigeration and Heat Pump Cycles Refrigeration Cycles Coefficient of Performance Heat Pump Cycles Coefficient of Performance cycle out W Q = γ in out out Q Q Q - = γ cycle in W Q = β in out in Q Q Q - = β
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Lecture 8 PES Su 2011 - ME 200 Thermodynamics I Lecture 8...

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