Thermodynamic cycles 2nd law of Thermodynamics Carnot Cycle Lecture 30: 2nd Law of Thermodynamics.

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Presentation transcript:

Thermodynamic cycles 2nd law of Thermodynamics Carnot Cycle Lecture 30: 2nd Law of Thermodynamics

Thermodynamic Cycles

Work in cycles

Heat engine

Efficiency

2 nd Law of Thermodynamics Clausius: Heat flows naturally from a hot object to a cold object; heat will not flow spontaneously from a cold object to a hot object. Kelvin-Planck: No device is possible whose sole effect is to transform a given amount of heat completely into work. impossible to construct perpetual motion machine of 2 nd kind

Carnot Cycle 1-2 isothermal expansion 2-3 adiabatic expansion 3-4 isothermal compression 4-1 adiabatic compression

Carnot Cycle 1-2 isothermal expansion 2-3 adiabatic expansion 3-4 isothermal compression 4-1 adiabatic compression

Efficiency of Carnot Cycle 1-2 isothermal expansion 3-4 isothermal compression 4-1 adiabatic compression 2-3 adiabatic expansion

Carnot Cycle has maximum efficiency Heat transfer during isothermal process reversible No heat transfer during process that involves temperature change Carnot cycle is reversible If more efficient engine existed: Couple hypothetical engine with reverse Carnot engine Transforms amount of heat completely into work Violates 2 nd Law More efficient engine can not exist