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Standard VIII

Physics

Expansion of Liquids

In a steam po...

Question

In a steam power plant operating on the Rankine cycle, steam enters the turbine at $4$ Mpa, $350^{o} C$ and exists at a pressure of $15$ kPa. Then it enters the condenser and exists as saturated water. Next, a pump feeds back the water to the boiler. The adiabatic efficiency of the turbine is $90$ %. The thermodynamic states of water and steam are given in the table.

h is specific enthalpy, s is specific entropy and v the specific volume; subscript f and g denote saturated liquid state and saturated vapour state.

Heat supplied $(k J k g^{- 1})$ to the cycle is

2372

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2576

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2863

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3092

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Solution

The correct option is C $2863$
also, $w_{P} = h_{4} - h_{3}$
$∴ 4.04 = h_{2} - 226.95$
or $h_{4} = 230.99 k J / k g$
Heat supplied to the cycle,
$q_{4 - 1} = h_{1} - h_{4} = 3092.5 - 230.99$
$= 2861.51 k J / k g = 2863 k J / k g$

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The correct option is C 2863also, wP=h4−h3 ∴4.04=h2−226.95 or h4=230.99kJ/kg Heat supplied to the cycle, q4−1=h1−h4=3092.5−230.99 =2861.51kJ/kg=2863kJ/kg

The correct option is C $2863$
also, $w_{P} = h_{4} - h_{3}$
$∴ 4.04 = h_{2} - 226.95$
or $h_{4} = 230.99 k J / k g$
Heat supplied to the cycle,
$q_{4 - 1} = h_{1} - h_{4} = 3092.5 - 230.99$
$= 2861.51 k J / k g = 2863 k J / k g$