CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Latent Heat

A steam power...

Question

A steam power plant operates on a regenerative cycle with a single open feedwater heater as shown in the figure. For the state points showwn, the specific enthalpies are $h_{1} = 3000$ $k J / k g$ and $h_{2} = 160 k J / k g$ . The bleed to the feedwater heater is 25% of the boiler steam generation rate. The specific enthalpy at state 3 is _____ kJ/kg

870

Open in App

Solution

The correct option is A 870
$h_{3} = m h_{1} + (1 - m) h_{2}$
$= 0.25 \times 3000 + (1 + 0.25) \times 160$
$h_{3} = 870 k J / k g$

Suggest Corrections

thumbs-up

0

Similar questions

Q. A thermal power plant operates on a regenerative cycle withh a single open feedwater heater, as shown in the figure. For the state points shown, the specific enthalpies are:

h_{1} = 2800 k J / k g

h_{2} = 200 k J / k g

. The bleed to the feedwater heater is

20

% of the boiler steam generation rate. The specific enthalpy at state

3

Q. A steam powe cycle with regneration as shown below on the

T - s

diagram employs a single open feedwater heater for efficiency improvement. The fluids mix with each other in an open feedwater heater. The turbine is isentropic and the input (bleed) to the feedwater heater from the turbine is at state

2

as shown in the figure. Process

3 - 4

occurs in the condenser. The pump work is negligible. The input to the boiler is the state

5

. The following information is available from the steam tables:
3350

State	$1$	$2$	$3$	$4$	$5$	$6$
Enthalpy $k J / k g$	$3350$	$2800$	$2300$	$175$	$700$	$1000$

The mass flow rate of steam bled from the turbine as a percentage of the total mass flow rate at the inlet to the turbine at state

1

Q. Consider an actual regenerative Rankine cycle with one open feed water heater. For each

k g

steam entering the turbine, if

m k g

steam wit ha specific enthalpy of

h_{1}

is balde from the turbine, and the specific enthalpy of liquid water entering the heater is

h_{2}

h_{3}

the specific enthalpy of saturated liquid leaving the heater is equal to

Q. In a Rankine cycle, the enthalpies at turbine entry and outlet are

3159 k J / k g

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

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

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Calorimetry

PHYSICS

Watch in App

explore_more_icon

Explore more

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon