lecture40 - VII. The second low of Thermodynamics 1....

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VII. The second low of Thermodynamics 1. Reversible and irreversible processes Mechanics Thermodynamics 2. Heat engines H.E. transforms heat partly into work or mechanical energy Working substance Cycle process: Δ U = 0 Δ U = Q - W = 0 W = Q = Q H + Q C = |Q H | - |Q C | T H T C engine W |Q C | |Q H | efficiency: H C H Q Q Q W 1 3. Refrigerators C H C C Q Q Q W Q k coefficient of performance: Heat can flow spontaneously from a hot object to a cold object; heat will not flow spontaneously from a cold object to a hot object.
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4. The second law of thermodynamics and heat engines It is impossible to build a heat engine with 100% efficiency 5. The Carnot Cycle (reversible) a b d c V P T H T C H C H C T T Q Q H C H H C C T T T T T 1 C H C C T T T k 6. The Carnot Cycle and the second law of thermodynamics No device is possible whose sole effect is to transform a given amount of heat completely into work (Note! An isothermal expansion completely converts the heat
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lecture40 - VII. The second low of Thermodynamics 1....

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