May 2011
Beginner
492 pages
14h 16m
English
Content preview from Heat and Thermodynamics
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9.11 Calculation of Efficiency of Rankine's Cycle
We shall first calculate the amount of work done. In the forward motion of the piston (AB portion of the curve in (Fig. 9.15)), a volume vS1 of the steam enters the cylinder at constant pressure p1. Hence, work done in operation AB is p1 vS1. In the operation CD, a volume vS2 of steam is forced out of the cylinder at constant pressure p2. Hence, the total work done is p2vS2. Total work done in the operations AB and CD is (p1vS1 − p2vS2).
Fig. 9.15 Rankine's cycle
In the case of adiabatic expansions, amount of work done is equal to the change in internal energy. Let US1 and US2 be the internal ...
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