This applet models the four steps of the Carnot cycle: (1) reversible isothermal expansion, (2) reversible adiabatic expansion, (3) reversible isothermal compression, and (4) reversible adiabatic compression.
The red box represents the hot reservoir at temperature Th, and the yellow box represents the cold reservoir, at temperature Tc. Notice the small black arrow that appears during step (1), demonstrating the direction of heat flow qh, from the hot reservoir to the system. In step (3), a small black arrow represent the the heat flow qc from the system to the cold reservoir. The narrow black rectangles that appear periodically next to the cyclinder, denote insulation. Recall that the efficiency of this engine, ε, equals 1 - (Tc/Th).
The temperature (T) / entropy (S) relationships are drawn on the graph to the right as the piston is expanded or compressed. The work done by the engine is equal to the area enclosed by the rectangle. This type of graph is sometimes called a Gibbs diagram. Click next step to see the next cycle of the Carnot cycle animated. Allow enough time for the piston to move before clicking next step again.
© 2003-2011 by Lawrence T. Sein. All rights reserved.
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