Heat engine

elements of mechanical

1. Sub:-Elements of Mechanical Engineering Topic:- Heat Engines Branch:- Mechanical Engg . ( 3 nd SEM) Prepared By Chintan Charola Shroff S.R. Rotary Institute of Chemical Technology Principle Supporter & Sponsor-United Phosphorous Ltd(UPL)/Shroff family Managed By Ankleshwar Rotary Education Society Approved by AICTE, New Delhi, Govt. of Gujarat & GTU Affiliated

2. 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 .

3. Elementary Heat Engine

4. Classification of Heat Engines External combustion engines

5. Internal combustion Engines

6. Heat Engine Cycles 1. Carnot Cycle 2. Rankine Cycle 3. Otto Cycle 4. Diesel Cycle

7. 1. CARNOT CYCLE

8. 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.

9. Assumptions Working fluid is a perfect gas. Piston Cylinder arrangement is weightless & does not produce Produce Friction during motion. The wall of cylinder & piston are considered as perfectly insulated. Compression & expansion are reversible. The transfer of heat does not change the temperature of source or sink.

10. Carnot cycle processes

11. 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.

12. RANKINE CYCLE

13. OTTO CYCLE ( constant volume cycle )

14. P-V and T-S diagram for Otto cycle

15. Application

16. DIESEL CYCLE

17. P-V & T-S diagram for Diesel cycle

18. Application

19. THANK YOU FOR YOUR ATTENTION