Lecture27

Lecture27 - Chapter 20 Entropy and the Second Law of...

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Chapter 20 Entropy and the Second Law of Thermodynamics 1 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010

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20.5. Engines Engines features: 1)Converts heat energy into mechanical work 2)There are many ways of how to convert heat into work 3)Engine should perform as much work as possible for the same amount of heat energy 2 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 Simplest engine: By heating and cooling gas cargo is moved up and down Heater Cooler V 1 V 2 PV = nRT All engines are based on ideal gas equation
20.5. Engines 3 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 Heater Cooler P 1 V 2 V 1 P 2 a d c b V 1 V 2 a – b: Gas is heated, cargo moves up at constant pressure b – c: Cargo is removed, gas is cooled to decrease pressure c – d: Gas is further cooled to move platform down d – a: Gas is heated again to maintain another cargo PV = nRT Q Q

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20.5. Carnot engine 4 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 Heater Cooler V 1 V 2 Carnot engine performs highest mechanical work for the same amount of the heat. Q
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Lecture27 - Chapter 20 Entropy and the Second Law of...

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