Diesel Engine Problem - Find total work

In summary, the conversation discusses a problem in an attached document which involves adiabatic compression and various equations for calculating temperature and work in different stages of the process. It is noted that one of the stages is not isothermal and this can be seen on a temperature-entropy plot for the diesel cycle.
  • #1
Pauli_Pocket
4
0

Homework Statement



The problem is in the attached document

Homework Equations



attached in pdf document

The Attempt at a Solution



1->2 adiabatic compression

T2=(V2/V1)^1-(Cp/Cv) = 987.7K
w1=nCvdT = (1mol)((3/2)*8.314J/molK)(987.7K-298K) = 8601.3 J

2->3 w2=-PdV=-Pmax(V3-V2) = 66.29bar(V3-0.1L)

3->4 w=nCvdT = (1 mol)(3*8.314J/molK)(T4-T3)

4->1 w=0
dH=nCpdT?
 

Attachments

  • diesel problem.pdf
    230.8 KB · Views: 277
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  • #2
"2->3 w2=-PdV=-Pmax(V3-V2) = 66.29bar(V3-0.1L)"

This relationship is for a reversible isothermal process. 2-3 is the combustion portion of the cycle and is not isothermal. This can be noted on a temperature-entropy plot for the diesel cycle.
 

What is a diesel engine?

A diesel engine is an internal combustion engine that uses compression ignition to ignite the fuel. It was invented by Rudolf Diesel in the late 1800s and is commonly used in vehicles, heavy machinery, and power generators.

What are some common problems with diesel engines?

Some common problems with diesel engines include hard starting, loss of power, excessive smoke, and engine knocking. These issues can be caused by various factors such as dirty fuel filters, faulty injectors, or low compression.

What is total work in relation to a diesel engine?

Total work refers to the amount of energy produced by a diesel engine in a given period. It is a measure of the engine's efficiency and is usually expressed in horsepower or kilowatts.

How can I find the total work of a diesel engine?

The total work of a diesel engine can be calculated by multiplying the engine's torque by its rotational speed. This can be measured using a dynamometer, which is a device that measures an engine's torque and rotational speed.

What can cause a decrease in the total work of a diesel engine?

A decrease in the total work of a diesel engine can be caused by various factors such as worn or damaged components, low fuel quality, or improper maintenance. It is important to regularly service and maintain diesel engines to ensure they are functioning at their optimal level.

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