View
1.481
Download
19
Category
Tags:
Preview:
DESCRIPTION
STIRLING RADIOISOTOPE GENERATOR
Citation preview
Seminar Guide-Ms. MANU SINGH
Presented By:Md. PARVEZ ALAM
Seminar Coordinator-Mr. NITIN SAXENA
STIRLING RADIOISOTOPE GENERATOR
1. INTRODUCTION2. OBJECTIVES3. COMPONENTS OF SRG4. WORKING OF COMPONENTS OF SRG5. ENERGY CONVERSION DIAGRAM6. OUTCOMES7. TECHNICAL CHALLENGES OF SRG DEVELOPMENT8. CURRENT DEVELOPMENT PLANS9. CONCLUSIONS
What is stirling engine?
•It is a heat engine operating by the cylic compression and expansion of gas
•The process occurs at various temperature levels
•Net conversion of heat energy to mechanical energy
•Mechanical energy electrical energy
Plutonium -238 fuel• (generates the heat)
Cladding • (encases the fuel)
Graphite heat source• (protects fuel and clad)
Converter• (heat electricity)
Radiator (removes excess heat)
Stirling generator system outputs • 120Vac• 60Hz, 130-140 watt of power• Continous power supply for ~14 years
To potentially reduce the amount and cost of fuel(plutonium-238-dioxide)
To enable cost effective space
exploration
HEAT SOURCE
STIRLING ENGINE
PM-DC BRUSH
GENERATOR
DC-AC INVERTER
DC-DC CONVERTER
HEAT SOURCE• It acts energy input of the entire system• Provide temperature difference needed to
operate stirling engine• Output of heat source = input of stirling engine
STIRLING ENGINE• Prime mover of system• Cooling, compression, heating and expansion• Thermal energy mechanical work• Output of engine shaft of PM-DC
generator
PM DC GENERATOR• Mechanical work electrical energy• The output is ‘dc’ due to presence of
brushes• Output fed to dc-dc converter
DC CONVERTER• It acts voltage regulator of system• It’s output is a clean dc signal of 170V dc• Output served to DC AC converter
DC AC INVERTER• It acts frequency regulator of system• Convert 170V dc 120V ac,60 Hz• Connected to load
Constant output power for long durations High efficiency(>27%) Low maintenance Can be implemented with any type of
heat source
Natural vibrations and electromagnetic interference should be below specified levels as given by DOE
Use of 55 watt electric converter could reduce the amount of Pu-238 fuel
At output a minimum of 10 W power Obtain minimum output efficiency of 25% Obtain a 120V (+/-5 %)signal of 60 Hz
Need of safe, reliable , long-lived exploration on space bodies such as MARS and in vacuum
Design of SRG giving output 100-120V of dc electric power
Some earlier successful launches were-• GALILIEO SPACECRAFT in orbit about jupiter• CASSINI SPACECRAFT in saturn’s moon• NEW HORIZON SPACECRAFT flying by pluto
Extensive efforts are taken to examine the relaibility of SRG
Traditoinal methods eg. failure mode graphs,criticality analysis of converter etc.
Generators undergo a series of performance tests like vibration, shock and thermal tests etc.
SYSTEM FAILURE CAUSES
The Pu-238 fuel is kept in steel containment capsules
Radioactive wastes dumped underground
Can be implemented with any type of heat source
Can be implemented in remote locations
RPS missions have changed our understanding of our solar system; to continue this increased understanding requires expanded used of RPS
QUERIES?????
THANKS
Recommended