Thermo Lecture 5

Boundary Work
- W_b = W_fric + W_atm + W_crank
- Area under a PV curve is boundary work
Work done during cycle

Difference of work done by the system and on the system
Boundary work with const. temp
- assuming ideal gas
polytropic process
- expansion and compression of gases
- PVⁿ= constant
- n = 0, const. P
- n = infinity, const. V
- n = 1, isothermal/ideal gas
- n = k = C_p/C_v, adiabatic/idel gas
Boundary work of polytropic process
First Law for a cycle
- Q_net - W_net = deltaU, where U is zero
- -> Q_net = W_net

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Thermo Lecture 5

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Thermo

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2010-02-01T00:26:32Z

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