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State and Path Variables, Functions

The values of...

Question

The values of enthalpy of steam at the inlet and outlet of a steam turbine in a Rankine cycle are $2800 k J / k g$ and $1800 k J / k g$ respectivey. Neglecting pump work, the specific steam consumption in $k g / / k W$ hour is

3.60

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0.36

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0.06

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0.01

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Solution

The correct option is A $3.60$

Given data:
SPecific enthalpy at turbine inlet,
$h_{1} = 2800 k J / k g$
Specific enthalpy at turbine
outlet: $h_{2} = 1800 k J / k g$
Specific work output by the turbine,
$W_{T} = h_{1} - h_{2} = 2800 - 1800$
$= 1000 k J / k g$
Net work output,
$w_{n} e t = w_{T} - w_{P}$
wherer pump work,
$w_{P} = 0$
$∴ w_{n e t} = w_{T} = 1000 k J / k g$
Specific steam consumption,
$s s c = \frac{3600}{1000} k g / k W h$
$= 3.6 k g / k W h$

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