Applied thermodynamics

1. University Of Gujrat
• Titel of presentation
Strilling and Ericson cycle application’s
Bs Mechanical 2nd
Smester
Present By:
15053386-035
15053386-036
15053386-037

2. Stirling Cycle & its Applications

3. What is a Stirling Engine?
• Device that converts heat energy to
mechanical power by alternately compressing
and expanding a fixed quantity of working
fluid at different temperatures is called
stirling Engine.
• External Combustion Engine.

4. History:-
• Inventor = Robert Stirling.
• Stirling Engine replace the
steam turbines of his days
due to frequent explosion
caused by unsustainable high
pressure killing and injuring
workers.
• Stirling engine invented in
1816 which could not explode
and produce more power
then the steam engine used.

5. Idealised Stirling Cycle
• 1-2 isothermal expansion heat addition from external source.
• 2-3 const. volume internal heat transfer from the gas to the
regenerator.
• 3-4 isothermal compression heat rejection to the external sink.
• 4-1 const. volume heat transfer internal heat transfer from the
regenerator to the gas.

6. Alpha Stirling Engine

7. Beta Stirling Engine

8. Why use Stiriling Engine?
• The Stirling cycle engine is environmental harmless and
high theoretical efficiency and almost silent operation.
• Plenty heat sources can be employed on Stirling engine
including combustable materials, agricultural waste,
biomass, biogas, solar energy and so on.
• The fuel ,the combustion air and the products of
combustion do not enter the engine cyclinder to become
working gas.
• It is closed cyclic system.

9. APPLICATIONS OF STIRILING ENGINE:-
1.Stirling Engines for Pumping Water using Solar Energy as a source
of Power
•Limited availability of petroleum product and electricity in rural areas and high
demandable human need for water; make demand for searching another
alternative for pumping water.
•One optional and potential engine solving this problem is the solar Stirling
engine
• In this system, the solar heat collector provides heat for the solar Stirling
engine which in turn provides AC power. The electrical power can be
transferred to a battery charger.
•Cost of the equipment is low comparetively.
•Solar Stirling engine will give good hope and way for pumping water in
rural areas.

11. • Solar Stirling
engine
• Uses reflected
sun rays as heat
source
• Green energy
• Could power a
house
http://www.researchdata.us/Images/Stirlingdish2.jpg

12. • Very large solar Stirling engine Could probably
power a small city.
http://www.tommccarty.com/blog/wp-content/uploads/2008/08/brightsource-solar-mojave2.jpg

13. 2. WASTE HEAT RECOVERY USING STIRLING
ENGINE
Different Energy Utilization Systems:-
a) Thermal Power Plant
b) Nuclear Power Plant
c) Gas Turbine Power Plant
d) Process Industries
e) Automotive Applications
Drawbacks of above Mentioned Energy Utilization Systems:-
All the systems use large amount of fossil fuels and reject large
amount of energy to the atmosphere thus causing global
warming, and wastage of fuel.

14. Types of waste heat recovery systems are;
1) Recuperators,
2) Regenerator,
3) Heat wheels,
4) Heat pipe.
Above mentioned waste heat recovery systems can utilise
high and medium temperature waste heat only. They cannot recover
low temperature waste heat effectively. So if we want to recover low
and very low temperature waste heat we can go for STIRLING ENGINE,
which can recover any kind of low grade waste heat because it is
external combustion engine and also its efficiency is very good.

16. • In other words, the engine
needs to warm up to obtain
and produce the useful
power.
• The engine can not change
its power output quickly.

17. Advantages of Stiriling Engine:-
• Stirling engines can run directly on any available heat source.
• A continuous combustion process can be used to supply heat,
so those emissions associated with the intermittent
combustion processes of a reciprocating internal combustion
engine can be reduced.
• The engine mechanisms are in some ways simpler than other
reciprocating engine types. No valves are needed,

18. • A Stirling engine uses a single-phase working fluid which
maintains an internal pressure close to the design pressure,
and thus for a properly designed system the risk of explosion
is low. In comparison, a steam engine uses a two-phase
gas/liquid working fluid, so a faulty overpressure relief valve
can cause an explosion.
• Waste heat is easily harvested (compared to waste heat from
an internal combustion engine) making Stirling engines useful
for dual-output heat and power systems.

19. Disadvantages of Stiriling Engine:-
• The engine is complex due to use of heaters
regenerators coolers.
• The cost of the engine is high.
• Stiriling engine requires a blower to force air through
preheater and combustion chamber ,this reduces
engine efficiency and noise

20. Ericsson Cycle

21. Ericsson Cycle
• The Ericsson cycle is named after
inventor John Ericsson, who designed and
built many unique heat engines based on
various thermodynamic cycles.
• He is credited with inventing two
unique heat engine cycles and
developing practical engines based
on these cycles.

22. Ericsson Cycle
• His first cycle is now known as the closed Brayton cycle, while
his second cycle is what is now called the Ericsson cycle.
• The Ericsson cycle consists of two isothermal and two
constant pressure processes.
• The p-V and T-s diagram with the mainframe structure of
Ericsson Cycle is shown in Fig.1.2:

23. Ericsson Cycle

24. Ericsson Cycle
• The processes taking place in Ericsson cycle is given
below:
a) Process 1-2: At a constant temperature the pressure of
air is increased, therefore the compression takes place.
b) Process 2-3: The increased pressure during this process is
maintained and further heat is added to the cylinder.

25. Ericsson Cycle
c) Process 3-4: Now, the temperature is again maintained
constant and the volume of air increases. Therefore the
expansion takes place.
d) Process 4-1: Again maintaining the pressure constant, heat
is removed from the cylinder system. Hence the process
reaches to its initial state, making the process reversible
cyclic process.

26. Ericsson Cycle
• Application of Ericsson Cycle:
Ericsson Engine
Ericsson Cycle
Engine

27. Thankyou!