heat engine
TRANSCRIPT
Sub:-Elements of Mechanical Engineering
Topic:- Heat Engines
Shroff S.R. Rotary Institute Of Chemical Technology (Managed by Ankleshwar Rotary Education Society ) Approved by AICTE, New Delhi, Govt. of Gujarat & GTU Affiliated
What is Heat Engine?
• Heat Engine is the device which converts chemical energy of fuel into heat energy & this heat energy is utilized converting it to mechanical work.
• A heat engine is a system that performs the conversion of heat to mechanical energy which can then be used to do mechanical work.
Elementary Heat Engine
Classification of Heat Engines
• External combustion engines
• Internal combustion Engines
Heat Engine Cycles
1. CARNOT CYCLE
• Carnot theorem says that No cycle can be more efficient than a reversible cycle operating between the same temperature limits.
• There are some assumption made in the working of the Carnot cycle.
Carnot cycle processes
Limitation of Carnot cycle
• The Carnot Cycle is Hypothetical ( something that doesn't really exist )
• Practically it is not possible to neglect friction between piston & cylinder.
• It is impossible to construct cylinder walls which are perfect insulator.
• The output obtained per cycle is very small.
RANKINE CYCLE
OTTO CYCLE ( constant volume cycle )
P-V and T-S diagram for Otto cycle
Application
DIESEL CYCLE
P-V & T-S diagram for Diesel cycle
Application