Answer to Question #275685 in Mechanical Engineering for RAVI

Question

(a) Explain various process of Carnot cycle with the help of P-V and T-S diagrams and mention various assumptions made in the analysis of Carnot cycle.

(b) The following details refers to a four stroke engine:

Cylinder diameter = 220 mm

Length of stroke = 330 mm

Speed = 5 rev/second

Effective brake load = 500 N

Mean circumstances of the brake drum = 4·5 m

IMEP = 5·6 bar

Calculate

(a) Indicated power, (b) Brake power and (c) Mechanical efficiency.

Answer 1

Carnot cycle P-V and T-s diagrams.

A carnot cycle undergoes four processes as explained before.

Process 1-2: This is an isothermal expansion process. Heat supplied is fully absorbed by the air

Process 2-3: this is an adiabatic expansion, no heat is transferred to the system. Work is done by the air

Process 3-4: this is an isothermal compression. Heat is released to the environment

Process 4-1: this is an adiabatic compression. It occurs at constant entropy. Work is done on the air.