Calculating Efficiency of Diesel Cycle

In summary, the conversation discusses how to calculate the efficiency of a diesel cycle given known values for pressure and volume at different stages, as well as the initial temperature and specific heat capacity and gas constant values. The person is unsure of how to incorporate the compression index and calculate the temperatures at each stage, but has already calculated the work done in a previous part of the question. Possible resources for further guidance on the diesel cycle are also provided.
  • #1
newe999
2
0
1. Homework Statement
given:
diesel cycle,
P1V1 P2V2 P3V3 P4V4 - all known
T1 = 20°c
specific heat capacity constant pressure = 1000j/kgk
specific gas constant = 287j/kgk
compression index = 1.4

2. Homework Equations
heres where i am stuck!


3. The Attempt at a Solution
Hi all, I am unsure where to go with this one. I am guessing that i need to work out T2.T3.T4, but can't find in any of my notes where any of the γ or R come into play or how to get T2T3T4?. i have already calculated the work done for each stage in a previous part of the question so i have that. Just not too sure on where to go from here to calculate the efficiency of the cycle?
 
Engineering news on Phys.org

What is the diesel cycle?

The diesel cycle is a thermodynamic cycle that describes the process of a diesel engine converting fuel into mechanical work. It consists of a compression stroke, fuel injection, expansion stroke, and exhaust stroke.

How do you calculate the efficiency of the diesel cycle?

The efficiency of the diesel cycle can be calculated by taking the ratio of the net work output of the engine to the energy input from the fuel. This is known as the thermal efficiency and is typically expressed as a percentage.

What factors can affect the efficiency of the diesel cycle?

The efficiency of the diesel cycle can be affected by various factors such as the compression ratio, air-fuel ratio, fuel injection timing, and engine speed. Other factors include the quality of the fuel, engine design, and operating conditions.

What is the ideal efficiency of the diesel cycle?

The ideal efficiency of the diesel cycle is determined by the Carnot efficiency, which is based on the maximum theoretical efficiency of a heat engine. The ideal efficiency of the diesel cycle is typically around 55-60%, but in reality, it is lower due to various inefficiencies.

How can the efficiency of the diesel cycle be improved?

The efficiency of the diesel cycle can be improved by optimizing the engine design and operating conditions, using higher quality fuel, and implementing technologies such as turbocharging and exhaust gas recirculation. Regular maintenance and proper driving habits can also help improve efficiency.

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