A petrol engine produces 250 kW while using 1.014 kg of fuel per minute. The fuel has a lower heating value of 45000 kJ/kg, and the engine has bore of 100 mm and the stroke-to-bore ratio of 1.2. The clearance volume of the cylinder is 1.178×10° mm³. The friction power is found to be 10% of the power that engine produces. Sketch (your own) the simple neat and clean block diagram of the engine, clearly indicating the control volume and control surface, with all the given data displayed on it. For air take the value of y=1.4.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter6: Forced Convection Over Exterior Surfaces
Section: Chapter Questions
Problem 6.10P
icon
Related questions
Question

solve it carefully

A petrol engine produces 250 kW while using 1.014 kg of fuel per minute. The fuel
has a lower heating value of 45000 kJ/kg, and the engine has bore of 100 mm and the
stroke-to-bore ratio of 1.2. The clearance volume of the cylinder is 1.178×10° mm.
The friction power is found to be 10% of the power that engine produces. Sketch
(your own) the simple neat and clean block diagram of the engine, clearly indicating
the control volume and control surface, with all the given data displayed on it. For air
take the value of y= 1.4.
Determine the following:
(a) The brake thermal efficiency (N, th).
(b) The indicated thermal efficiency ( 7,md,ch)-
(c) The mechanical efficiency ( 7mch ).
(d) The brake engine efficiency (7,).
(e) The indicated engine efficiency (7ina).
(Hint: Engine efficiency is a function of how the ideal work or power is calculated.
Frequently, the air-standard cycle is used for calculating the theoretical work.)
NOTE (Q 4): Use standard symbols and write units is each and every step
of the problem.
Transcribed Image Text:A petrol engine produces 250 kW while using 1.014 kg of fuel per minute. The fuel has a lower heating value of 45000 kJ/kg, and the engine has bore of 100 mm and the stroke-to-bore ratio of 1.2. The clearance volume of the cylinder is 1.178×10° mm. The friction power is found to be 10% of the power that engine produces. Sketch (your own) the simple neat and clean block diagram of the engine, clearly indicating the control volume and control surface, with all the given data displayed on it. For air take the value of y= 1.4. Determine the following: (a) The brake thermal efficiency (N, th). (b) The indicated thermal efficiency ( 7,md,ch)- (c) The mechanical efficiency ( 7mch ). (d) The brake engine efficiency (7,). (e) The indicated engine efficiency (7ina). (Hint: Engine efficiency is a function of how the ideal work or power is calculated. Frequently, the air-standard cycle is used for calculating the theoretical work.) NOTE (Q 4): Use standard symbols and write units is each and every step of the problem.
Expert Solution
steps

Step by step

Solved in 2 steps with 3 images

Blurred answer
Knowledge Booster
Dimensional Analysis
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Principles of Heat Transfer (Activate Learning wi…
Principles of Heat Transfer (Activate Learning wi…
Mechanical Engineering
ISBN:
9781305387102
Author:
Kreith, Frank; Manglik, Raj M.
Publisher:
Cengage Learning