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 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.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

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 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...
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...
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 ×...
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...
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...
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...
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...
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...
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...
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 %