1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ladessa [460]
3 years ago
5

A steam power plant with a power output of 230 MW consumes coal at a rate of 60 tons/h. If the heating value of the coal is 30,0

00 kJ/kg, determine the overall efficiency of this plant.
Engineering
1 answer:
NARA [144]3 years ago
7 0

Answer:

\eta =46\%

Explanation:

Hello!

In this case, we compute the heat output from coal, given its heating value and the mass flow:

Q_H=60\frac{tons}{h}*\frac{1000kg}{1ton}*\frac{1h}{3600s}*\frac{30,000kJ}{kg}\\\\Q_H=500,000\frac{kJ}{s}*\frac{1MJ}{1000J} =500MW

Next, since the work done by the power plant is 230 MW, we compute the efficiency as shown below:

\eta =\frac{230MW}{500MW}*100\% \\\\\eta =46\%

Best regards!

You might be interested in
One kg of an idea gas is contained in one side of a well-insulated vessel at 800 kPa. The other side of the vessel is under vacu
laiz [17]

Answer:

Option C = internal energy stays the same.

Explanation:

The internal energy will remain the same or unchanged because this question has to do with a concept in physics or classical chemistry (in thermodynamics) known as Free expansion.

So, the internal energy will be equals to the multiplication of the change in temperature, the heat capacity (keeping volume constant) and the number of moles. And in free expansion the internal energy is ZERO/UNCHANGED.

Where, the internal energy, ∆U = 0 =quantity of heat, q - work,w.

The amount of heat,q = Work,w.

In the concept of free expansion the only thing that changes is the volume.

7 0
3 years ago
A crude fermenter is set up in a shed in the backyard of a suburban house. Under anaerobic conditions with ammonia as the nitrog
Aleks04 [339]

Answer:

using calculations Heat losses will be 4512 J

5 0
3 years ago
3.8 LAB - Select lesson schedule with multiple joins
dem82 [27]

Answer:

The database has three tables for tracking horse-riding lessons: Horse with columns: ID - primary key; RegisteredName; Breed; Height; BirthDate.

Explanation:

4 0
2 years ago
What is electromagnetic induction?
Over [174]
The process of using magnetic fields to produce voltage.
6 0
3 years ago
In order to protect yourself if you have a dispute with another drivers insurance company you should:
klio [65]

Answer:

  C. Get the names and addresses of witness to the crash

Explanation:

The best approach is to let your insurance company handle the dispute. Since that is not an option here, the best thing you can do is make sure you know who the witnesses are, so your insurance company can call upon them as needed.

8 0
3 years ago
Other questions:
  • A mass of 0.3 kg is suspended from a spring of stiffness 0.4 N/mm. The damping is 3.286335345 kg/s. What is the undamped natural
    5·1 answer
  • This is a blueprint drawing of the stage area at Millennium Park. The length of one square on the grid is equal to 5 feet. Accor
    14·1 answer
  • 2.4 kg of nitrogen at an initial state of 285K and 150 kPa is compressed slowly in an isothermal process to a final pressure of
    8·1 answer
  • Finally you will implement the full Pegasos algorithm. You will be given the same feature matrix and labels array as you were gi
    12·1 answer
  • A piston–cylinder device contains 0.78 kg of nitrogen gas at 140 kPa and 37°C. The gas is now compressed slowly in a polytropic
    11·1 answer
  • Cho biết tác dụng chung của các hệ giằng khung ngang nhà công nghiệp nhẹ 1 tầng 1 nhịp.
    13·1 answer
  • (I really need help ASAP please!! this is for science her is the problem)
    5·2 answers
  • What can be used to measure the alcohol content in gasoline? A. Graduated cylinder B. Electronic tester C. Scan tool D. Either a
    5·1 answer
  • : A drive system using the electric motor is under load as 75Nm with an angular velocity of 100rad/s, then the electric motor is
    11·1 answer
  • Which of the following might a cement mason or concrete finisher be responsible for? (Select all that apply).
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!