Thermal efficiency and compression ratio, Mechanical Engineering

Assignment Help:

Thermal efficiency and compression ratio:

Calculate thermal efficiency and compression ratio for automobile working on otto cycle. If energy generated per cycle is thrice which of rejected during the exhaust. Consider fluid as an ideal gas with = 1.4       

Sol.: Since we have

Where

Wotto = (Q1  - Q2)/Q1

Q1 = Heat supplied

Q2 = Heat rejected

Given that     Q1 = 3Q2

otto = (3Q2  - Q2)/3Q2  = 2/3 = 66.6%                                                   ...(i)

We also have;

Qotto = 1 - 1/(r)  - 1

0.667 = 1/(r)1.4 - 1

r = (3)1/0.4  = 15.59

 


Related Discussions:- Thermal efficiency and compression ratio

Torsion lenght, Thin wall round tube has diameter of 60mm. The end of it wi...

Thin wall round tube has diameter of 60mm. The end of it will be compressed to square for. How many percents torsion strenght will become lower at the end tube?

What are the need of a surface condensing, (a) What are the need of a surfa...

(a) What are the need of a surface condensing ? Write disadvantages and advantages of Jet condenser and surface condenser. (b) A surface condenser is designed to handle 10000 Kg

Thermodynamics, Energy in state and it''s transition

Energy in state and it''s transitions

Electromagnetic conversion device with example., Q.  In every electromagne...

Q.  In every electromagnetic conversion device, both generator and motor action take place simultaneously. Explain. The case the output is mechanical as in a motoring mode, th

Files tool and equipment , Files: Files are used to remove excess metal by...

Files: Files are used to remove excess metal by cutting action. These can be classified according to their length, shape, cross-section.

Gathering lines, Gathering Lines: A gathering line, also called a lad...

Gathering Lines: A gathering line, also called a ladder track, is one into which a number of parallel tracks merge. This is shown in Figure. It is used in marshalling yards.

GOVERNOR, IN CASE OF WILSON HARTNELL GOVERNOR THERE TWO MAIN SPRINGS AND TH...

IN CASE OF WILSON HARTNELL GOVERNOR THERE TWO MAIN SPRINGS AND THERE ARE ONE AUXILIARY SPRING. AND NATURE OF SPRINGS ARE TENSION ALWAYS HOW IT CAN POSSIBLE? WHEN SLEEVE WILL MOVE D

Cad-cam data exchange, CAD-CAM Data Exchange: The interface SET transf...

CAD-CAM Data Exchange: The interface SET transferred information on wire-frames, surfaces, B-representation and FEM models as well as technical drawings and scientific data. I

Develop a computer-based methodology, Consider the U-shaped curved beam sho...

Consider the U-shaped curved beam shown below (with rectangular cross-section and thickness h ), which is loaded by force P as indicated. A free-body diagram reveals that a mome

What are the instructions to charge a battery?, (a) How is specific gravity...

(a) How is specific gravity of electrolyte (battery water) measured and what should be the value of specific gravity? (b) How would you measure battery voltage and what is its reco

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd