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Carnot Cycle

In a Rankine ...

Question

In a Rankine cycle, the enthalpies at turbine entry and outlet are $3159 k J / k g$ and $2187 k J / k g,$ respectively. If the specific pump work is $2 k J / k g$ , the specific steam consumption (in $k g / k W h$ ) of the cycle based on net output is
3.711

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Solution

The correct option is A 3.711

$w_{t u r b i n e} = h_{1} - h_{2}$
( $3159 - 2187) k J / k g = 972 k J / k g$
$w_{n e t} = w_{t u r b i n e} - w_{p u m p}$
$= 972 - 2 = 970 k J / k g$
Specific steam consumption
$= \frac{3600}{970} k g / k W h$
$3.711 k g / k W h$
Specific steam consumption is amount of steam required to produce $1 k W h$ or $3600 k J$ of work

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