Question

At a steam power plant, steam engines work in pairs, the heat output of the first one being the approximate heat input of the second. The operating temperatures of the first are 710 ∘C and 440 ∘C, and of the second 415 ∘C and 250 ∘C.

If the heat of combustion of coal is 2.8×107J/kg, at what rate must coal be burned if the plant is to put out 960 MW of power? Assume the efficiency of the engines is 65% of the ideal (Carnot) efficiency.

Express your answer using two significant figures.

Answer #1

At a steam power plant, steam engines work in pairs, the heat
output of the first one being the approximate heat input of the
second. The operating temperatures of the first are 770 ∘C and 430
∘C, and of the second 405 ∘C and 290 ∘C.
A) If the heat of combustion of coal is 2.8×107J/kg2.8×107J/kg,
at what rate must coal be burned if the plant is to put out 950
MWMW of power? Assume the efficiency of the engines...

A typical coal-fired power plant generates 1000 MW of usable
power at an overall thermal efficiency of 40%.
PART A:
What is the rate of heat input to the plant? Answer in MW
PART B:
The plant burns anthracite coal, which has a heat of combustion
of 2.65×107J/kg. How much coal does the plant use per day, if it
operates continuously? Answer in kg
PART C:
At what rate is heat ejected into the cool reservoir, which is
the nearby...

The power output of a power plant is 5MW.The power plant rejects
heat to a nearby lake at the rate of 6MW. (a) What is the heat
input to the power plant? (b) What is the efficiency of the power
plant The temperature of the heat source is 600K while the
temperature of the ambient is 270C. (c) What is the Carnot
efficiency of this power plant? (d) Does the operation of this
power plant violate the second law of...

Part A A coal-fired plant generates 600 MW of electric power.
The plant uses 4.8 × 106 kg of coal each day. The heat produced by
the combustion of coal is 3.3 × 107 J/kg. The steam that drives the
turbines is at a temperature of 300°C, and the exhaust water is at
37°C.
Part A
(a) What is the overall efficiency of the plant for generating
electric power?
Part B
(b) What is the maximum efficiency that this plant...

A coal-burning power plant that uses an evaporating water tower
to cool the generated steam has the following characteristics: uses
about 2,000 metric tons/day of bituminous coal, has an overall
efficiency of 35% in converting the energy from the combustion of
coal to electricity, and 10% of the heat energy produced is lost to
the surrounding environment as hot air through the chimney of the
plant (stack). Determine how much water is required to run the
plant, i.e., to cool...

1. Calculate the efficiency of a fossil-fuel power plant that
consumes 360 metric tons of coal each hour to produce useful work
at the rate of 740 MW. The heat of combustion of coal (the heat due
to burning it) is 28 MJ/kg. (2 significant figures)
2. A heat pump is used to heat a building. The external
temperature is lower than the internal temperature. The pump's
coefficient of performance is 4.20, and the heat pump delivers 4.58
MJ as...

Consider a power plant operating on a Rankine cycle
using steam as the
working fluid. The boiler pressure is 2.8 MPa and the steam leaving
the boiler is
superheated to a temperature 110 0C above its saturation
temperature. The condenser
temperature is 49 0C. Condenser discharges saturates liquid. The
efficiency of the
turbine is 0.90 and of the pump 0.8 as compared to reversible and
adiabatic
machines operating at the same pressure ranges.
a) Sketch the cycle on a T-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...

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

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 %

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 7 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago