Question

At a steam power plant, steam engines work in pairs, the heat output of the first...

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 is 65% of the ideal (Carnot) efficiency.

B) Water is used to cool the power plant. If the water temperature is allowed to increase by no more than 4.5∘C∘C, estimate how much water must pass through the plant per hour.

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
At a steam power plant, steam engines work in pairs, the heat output of the first...
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. A. 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...
At a steam power plant, steam engines work in pairs, the heat output of the first...
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...
A coal-burning power plant that uses an evaporating water tower to cool the generated steam has...
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...
The power output of a power plant is 5MW.The power plant rejects heat to a 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...
A typical coal-fired power plant generates 1000 MW of usable power at an overall thermal efficiency...
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...
Part A A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 ×...
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...
Consider a power plant operating on a Rankine cycle using steam as the working fluid. The...
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...
The condenser of a large steam power plant is a heat exchanger in which steam is...
The condenser of a large steam power plant is a heat exchanger in which steam is condensed to liquid water. Assume the condenser to be a parallel flow shell-and-tube heat exchanger consisting of a single shell and 10,000 tubes, each executing two passes. The tubes are of thin wall construction with D = 30 mm and the steam condenses on their outer surface. The heat transfer rate that must be effected by the exchanger is Q = 2 × 10^9...
Consider a steam power plant which operates on the Rankine cycle. The pressures in the boiler...
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,...
1. Calculate the efficiency of a fossil-fuel power plant that consumes 360 metric tons of coal...
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...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT