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Work Energy Theorem Application

In the Rankin...

Question

In the Rankine cycle when superheated steam is used

A

Thermal efficiency increases

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B

Steam consumption decreases

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C

Steam dryness after expansion increases

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D

All of the above

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Solution

The correct option is D All of the above
In the Rankine cycle, when superheated steam is used:
(i) Thermal efficiency increases
(ii) Steam consumption decreases
(iii) Steam dryness after expansion increases
(iv) Heat input and heat rejection increases

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Similar questions

Q. In a steam power plant operating on a ideal Rankine cycle, superheated steam enters the turbine at

3

350^{o}

C. The condenser pressure is

75

kPa. The thermal efficiency of the cycle is .......
Given data: For saturated liquid at

p = 75

h_{f} = 384.39

k J / k g,

v_{f} = 0.001037 m^{3} / k g

s_{f} = 1.213 k J / k g K

75 k P a, h_{f g} = 2278..6 k J / k g

s_{f g} = 6.2434

k J K

p = 3 M p a

T = 350^{o} C

(superheated steam),

h = 3115.3 k J / k g, s = 6.7428 /, k J / k g K

Q. In a steam power plant based on ideal Rankine cycle, superheated steam enters the turbine at 1.4 MPa and

500^{\circ} C

where it expands to a condensor pressure of 0.01 MPa. Superheated steam properties are; At 1.4 MPa and

500^{\circ} C, h = 3474.1 k J / k g a n d s = 7.6027 k J / k g K

Saturated water properties are given in below table:

The cycle efficiency is ____% (Correct upto two decimal places).
Take specific volume of saturated liquid at 0.01.MPa as

0.00101 m^{3} / k g

.

Q. The efficiency of superheat Rankine cycle is higher than that of simple Rankine cycle because

Q. 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

1800 k J / k g

respectivey. Neglecting pump work, the specific steam consumption in

k g / / k W

Q. An ideal reheat Rankine cycle operates between the pressure limits of

10 k P a

8 M P a

, with reheat being done at

4 M P a

.The temperature of steam at the inlets of both turbines is

500^{o} C

and the enthalpy of steam is

3185 k J / k g

. Use the following table for relevant data.

Super heated steam temperature $(^{o} C)$	Pressure $(M P a)$	$v$ $(m^{3} / k g)$	$h$ $(k J / k g)$	$s$ $(k J / k g K)$
$500$	$4$	$0.08644$	$3446$	$7.0922$
$500$	$8$	$0.04177$	$3399$	$6.7266$

Disregarding the pump work, the cycle efficiency (in percentage) is

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