Question

Steam power plants are responsible for the production of most
electric power in the world. A small increase in thermal efficiency
can mean large savings from the fuel requirements. Consider a steam
power plant that operates on a simple ideal Rankine cycle. Steam is
cooled in the condenser at a pressure of 75 kPa by running cooling
water at 16°C from the nearby river through the tubes of the
condenser. To increase the thermal efficiency of the power cycle, a
junior engineer proposed to decrease the operating pressure of the
condenser to 2 kPa while maintaining the turbine inlet conditions
at constant.

You are asked to assist the junior engineer with the analysis of
the feasibility of the proposal. Include the following in your
report:

i. Outline the function, modes of energy transfer, and energy
balance for each device in the steam power plant.

ii. Select appropriate turbine inlet conditions (i.e. pressure and
temperature) with justifications. Analyse and discuss the effect of
the condenser pressure as it is varied from 75 kPa to 2 kPa on the
performance of the steam power plant while the turbine is operated
and maintained at the selected inlet conditions. Organize relevant
data/findings in a table and appropriate charts to illustrate the
effect of varying condenser pressure on the performance of the
steam power plant. Show one set of detailed sample calculation

Answer #1

Consider a steam power plant which operates on the Rankine
cycle. The pressures in the boiler and the condenser are 5000 kPa
and 40 kPa, respectively. The temperatures at the inlet of the
turbine and at the inlet of the pump are 500oC and 70oC,
respectively. The isentropic efficiency of the turbine is 94
percent, pressure and pump losses are negligible. If the mass flow
rate of steam is 10 kg/s. Determine (a) the heat transfer rate in
the boiler,...

Consider a 210-MW steam power plant that operates on a simple
ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500°C
and is cooled in the condenser at a pressure of 7.5 kPa.
a.)Determine the quality of the steam at the turbine exit. Use
steam tables.
b.)Determine the thermal efficiency of the cycle.
c.)Determine the mass flow rate of the steam

Consider a 210-MW steam power plant that operates on a simple
ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500°C
and is cooled in the condenser at a pressure of 7.5 kPa. Determine
the quality of the steam at the turbine exit. Use steam tables.
(You must provide an answer before moving on to the next part.)
a.)The quality of the steam at the turbine exit is?
b.)Determine the thermal efficiency of the cycle.The thermal
efficiency of...

Please find the correct option.(A-B-C-D)
In a steam power plant with a net power of 30 MW and operating
according to the ideal Rankine cycle, the steam enters the turbine
at 10MPa and 500 ° C and is condensed in a condenser at a pressure
of 10 kPa. Find the thermal efficiency of the cycle.
A-) 15 %
B-) 34 %
C-) 20 %
D-) 40 %

Steam enters the turbine of an ideal Rankine cycle power plant
with a pressure of 12.5 MPa and a temperature of 600°C and expands
adiabatically to condenser pressure equal to 30 kPa . Please answer
the following: a. Represent the cycle on a T-s diagram, indicate
the values of the isobars and temperature and entropy on the axes.
b. Compute the thermal efficiency for this cycle.

QUESTION 5
A steam power plant is designed to operate on a reheat Rankine
cycle to produce 115 MW
of a net power output. Due to metallurgical limitation, the
high-pressure turbine is limited to
operate at maximum pressure and temperature of 15 MPa and 650°C,
respectively. The lowpressure
turbine is to operate at maximum pressure and temperature of 3.5
MPa, and
500°C, respectively. Both high and low pressure turbines have
maximum isentropic
efficiency of 87 percent. The maximum reheat pressure...

A steam power plant of 15 MW operates on the simple ideal
Rankine cycle such that the water leaves the condenser as a
saturated liquid at a pressure of 15 kPa. The pressure of the water
leaving the pump is 5.0 MPa, and the temperature of the steam
entering the turbine is 650 ºC. (a) Show the sketch and cycle on a
T-s diagram. Determine (b) the thermal efficiency of the cycle and
(c) the mass flow rate in kg/s....

In a steam power plant which has a net power output of 45 MW,
steam is supplied at 10 MPa and 500°C. The steam is reheated after
passing through high pressure turbine to its original temperature
at a pressure of 1 MPa. Then the steam expanded to condenser
pressure. The condenser pressure is 5 kPa. Show the cycle on a T-s
diagram with respect to saturation lines, and determine; (i) the
thermal efficiency of the cycle; and (ii) the mass...

Increasing the temperature of the heat addition (T subscript
H) in any heat engine cycle, with keeping all other parameters
unchanged:
A.
None of the answers.
B.
Decreases the heat added at high temperature.
C.
Increases the thermal efficiency of the cycle.
D.
Decreases the thermal efficiency of the cycle.
1 points
QUESTION 2
The maximum thermal efficiency of the Rankine cycle power
plant is achieved when:
A.
it works on Carnot heat engine cycle.
B.
the pump work...

A steam power plant operates on the simple ideal rankine cycle
between the pressure limits of 50 kPa and 20 MPa, with a turbine
inlet temperature of 600 Degree C. Disregarding the pump work,
then:
(a) Show the T-S diagram of the entire cycle.
(b) Solve the total heat (kJ/kg) input for the cycle.
(c) Solve the total heat (kJ/kg) reject by the cycle.
(d) Solve the thermal efficiency of this plant.

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