TFlecture05

TFlecture05 - Calculation of Work in the Stirling Cycle We...

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Calculation of Work in the Stirling Cycle We have shown in the previous class that the Stirling cycle consists of four processes: The four processes are: I. Isothermal expansion II. Cooling at constant volume III. Isothermal compression IV. Heating at constant volume Let us number each of the states such that the initial state, state 1, corresponds to the ambient condition of pressure, temperature, and volume. Process 1 – 2. Isothermal compression Process 2 – 3. Heating at constant volume Process 3 – 4. Isothermal expansion Process 4 – 1. Cooling at constant volume The Stirling cycle is represented on a pressure-volume (p – v) diagram as: We shall now compute the work for each of the processes and for the cycle as a whole. 1 3 4 1 2 p V V 1 = V 4 V 3 = V 2 Isothermal expansion Isothermal compression Cooling at constant volume Heating at constant volume

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Recall the work expression for a piston-cylinder system. = = 2
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TFlecture05 - Calculation of Work in the Stirling Cycle We...

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