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

Boiler, boiler performance.

boiler performance.

What do you mean by turret nozzle, Q. What do you mean by turret Nozzle? ...

Q. What do you mean by turret Nozzle? Turret Nozzle - Turret nozzles are large nozzles that can deliver large quantities of water quickly. They are used on very large fires whe

Design air coolers for plant layout, Q. Design Air Coolers for plant layout...

Q. Design Air Coolers for plant layout? As air coolers (sometimes called aerial coolers, or fin-fans) have extensive heat transfer surfaces, they are more vulnerable to failure

Determine the actual average pressure, A multiple disc clutch, steel on bro...

A multiple disc clutch, steel on bronze, is to transmit 4.5 kW at 750 r.p.m. The inner radius of contact is 40mm and outer radius of the contact is 70 mm. The clutch operates in oi

Advantage of flash butt welding, Advantage of flash butt welding 1. Hig...

Advantage of flash butt welding 1. Higher weld strength 2. Higher production rate 3. Better heat concentration 4. Simple weld surface preparation 5. Wide range of m

Thermodynamic equilibrium - thermodynamics, Thermodynamic equilibrium - The...

Thermodynamic equilibrium - Thermodynamics: Equilibrium is the state of a system in which the state does not undergo any change in itself with the passage of time without the

Computer integrated manufacturing, methods involved in grouping the parts i...

methods involved in grouping the parts into families?

Evaluate maximum stress, Show that for a flat circular steel plate subjecte...

Show that for a flat circular steel plate subjected to uniform pressure on one surface, the maximum stress when the periphery is freely supported is 1.65 times that when the periph

Dryness fraction of steam - thermodynamics, Drynes s Fraction of Steam: ...

Drynes s Fraction of Steam: Dryness fraction of steam is factor which used to specify the quality of steam. It can be defined as the ratio of weight of dry steam W d s pr

Measurement in production system, Measurement in Production System: Th...

Measurement in Production System: This unit explain the performance measurement in an organisation. More than just a passive means for assessing what has already occurred, the

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