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

Refrigeration, In a steam jet refrigeration system, the ejector extracts 3....

In a steam jet refrigeration system, the ejector extracts 3.3 m3/s of saturated water vapor at a temperature of 7.2 °C from the flash chamber. The return water from the cooling coi

Lacashire boiler, LACASHIR E BOILER : It is fire tube, internally ...

LACASHIR E BOILER : It is fire tube, internally fired, stationary, horizontal, natural circulating type boiler. Evaporative capacity can be up to 8500 kg/hr. and can opera

Four-stroke - single cylinder gasoline engine, A four-stroke, single cylind...

A four-stroke, single cylinder gasoline engine having a bore of 90 mm and stroke of 100 mm has a compression ratio 7. The relative efficiency is 55% when the shown specific fuel co

Manufacturing , Differentiate between hot working and cold working process

Differentiate between hot working and cold working process

Maintenance operations, Maintenance Operations: The maintenance opera...

Maintenance Operations: The maintenance operations cover various activities such as: (a) making good rain cuts in embankment, (b) clearing the side ditches of vegetatio

Explain about ducts and flues in steam generators, Q. Explain about Ducts a...

Q. Explain about Ducts and Flues in steam generators? All air ducts and gas flues connecting the forced draft fan, fan intake silencer, preheater, and transition piece at the g

Control cables and rubber parts, Control Cables: Never bend or distort con...

Control Cables: Never bend or distort control cables. This will lead to stiff operation and premature cable failure. Rubber Parts: Beware of parts containing O-rings or oil s

Comparison of disc and drum type brakes drum brake , Comparison of Disc and...

Comparison of Disc and Drum type Brakes Drum Brake Disc Brake Drum brakes have cooling problem because the friction occurs at internal surfaces,

Simple Mechanisms, I have an assignment on kinematic chains.I have to tell ...

I have an assignment on kinematic chains.I have to tell the type of chain whether it is locked,constrained or unconstrained?? I am facing problem in counting number of joints,pair

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