METEO 300 Lecture Notes - Lecture 24: Isentropic Process, Irreversible Process
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Me 300 - lecture 24 - reversible (carnot) cycle. Reversible process: one in which the system and all parts of its surroundings can be restored to their initial states. *real processes are irreversible and have some degree of irreversibility that prevents the system and surroundings from returning to their initial states. For a general, reversible process: = symbol: s, unit: j/k. For an isolated system (no boundary interactions, = 0): 0. *if the cycle runs in a clockwise direction, there is net heat in. = the area enclosed in a p-v diagram. = the area enclosed in a t-s diagram. *if the cycle runs in a counter-clockwise direction, there is net heat out. 4-1: reversible adiabatic (isentropic compression), no heat transfer. 2-3: reversible adiabatic (isentropic) expansion, no heat transfer. | 12: (2 1)| processes are isentropic (have the same entropy). We know that 2 =3 and 4 =1 because these. The ratio goes to one (| 1|) and this becomes:
