Stirling Engine applications

8/2/2019 Stirling Engine applications

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Marthi P K P Chaitanya Raghav



Stirling Engine?

• Historical Importance

• Current significance

• Configurations of Stirling Engine – Alpha, Beta and Gamma

• LTD- stirling engine



Stirling Engine Mechanism

Beta configuration Stirling Alpha configuration Stirling



Const. Vol Heat Addition

Isothermal exp

Const Vol heat rejec.

Isothermal comp..



Striling Cycles

• 1-2 – constant expansion (heat addition from the external

source)

• 2-3

– constant regeneration (internal heat transfer fromthe working fluid to the regenerator)

• 3-4 – constant compression (heat rejection to the external

sink)

• 4-1 – constant regeneration (internal heat transfer from

the regenerator back to the working fluid)



PV and TS Diagrams of Stirling Engine

V1 = V4; V2= V3r= V4/ V3 = V1/ V3

Net work done = mR (Thigh-Tlow) ln(r)

Heat Supplied = mR Thigh ln(r)

Efficiency = 1 – (TL / TH )



D il d Vi f C



Detailed View of Components

Fly Wheel

Power Piston

DISPLACER

D il d Vi f C



Detailed View of Components

From Here Cold Region

Hot Plate

Fly Wheel

POWER Piston



Requirements

• Fly wheel gives the momentum to movesystem from one stage to another

• Displacer and Power Piston are keyelements in whole Stirling engine

• Counter weight to nullify the vibrations

• Hot and Cold areas• DEWAR with conducting plates



Combined Heat and Power (CHP)

• Works efficiently at low temp differences

• Decreasing thermal pollution

• Increases over all efficiency of ThermalPower Plant

– Over all efficiency = 88% (Helium)

• 80,000 units of electricity is generatedusing exhaust in 2004, UK

Exhaust



Solar power generation

• With an attached generator and parabolicmirror electricity is produced

• It has better efficiency better than typical

photovoltaic cells

• Parabolic Dishes: Stirling Engine, WorkingFluid: Helium (50 -200 bar, 600 - 1200°C)

• No emission of pollutants

• Uninterrupted power generation for 14 hours

– 5AM to 7PM in summers



State of Art Design

• Operates at Temp. difference of 600 kelvin

• Solar Tracker to position whole systemtowards sun

• Each modules generates 4 kilowatts ..!!

• No impact on environment

• High reliability• Zero Maintenance



Advantages of Stirling Engine

• Impossible to explode

• Refilling not required

• Any kind of fuel or heat source can beused

• Can be designed at zero emissions

• It can run even at small temp. diffs.• Waste heat is easily harvested eg. CHP



Electricity Crisis in India

• 800 million Indian homes do not haveproper electric supply

• Requirement in 2012 grows to 1,097

Billion kWh – Demand = 861,591 million kWh

– Produced =788,355 million kWh

• How do we meet this demands?(Commercial/ Household needs)

70 Giga kWh



Prospects in India

• Solar Potential in India is 5,000 trillion kWh perYear

• Insolation: 4 to 7 kWh /m2 / day

• 35,000 km2 Area of Thar Desert has been setaside for Power Projects, Sufficient to Generate7,00, 000MW to 21,00,000 MW

• Electricity costs can be reduced



Conclusion

• Perfect Solution for India’s energy needs

– Zero Thermal Pollution

– Low Maintenance

– No Fuel required

• Noise free operation and No Vibrations

• To meet the energy requirements of thecountry and electrify rest of the villages inIndia



Courtesy

• A review of solar-powered Stirling engines and low temperaturedifferential Stirling engines by Bancha Kongtragool, SomchaiWongwises

• Gas Power Cycles Prof. U.S.P. Shet , Prof. T. Sundararajan andProf. J.M . Mallikarjunahttp://www.nfc-forum.org

• www.wikipedia.com

• www.indexmundi.com/India/Economy

• www.eurosolar.in/electricity_india.htm

• http://www.robertstirlingengine.com

• Documents from “Plataforma Solar de Almería”

• Solar Thermal Market in India, Dr. Nilesh Bhatt

http://www.wikipedia.com/


http://www.indexmundi.com/India/Economy


http://www.eurosolar.in/electricity_india.htm


http://www.robertstirlingengine.com/












THANK YOU

Stirling Engine applications

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