Goal
Convert heat energy into usable electrical power at practical voltage and current levels.
Problem
Conventional thermionic converters require very high temperatures, extremely close electrode spacing, and cascaded units to achieve usable voltage, limiting practicality and scalability.
Concept Summary
The invention combines a thermionic emitter cylinder (coated with a BaO-SrO-CaO mixture) and a coaxial inner collector cylinder (graphite-coated) separated by a vacuum gap. Inside the inner cylinder a thermopile of SiC-carbon thermocouples generates a positive potential that assists electron emission. A solid-state switching circuit alternately connects two such generators to charging capacitors and a load, allowing continuous high-current output (~=200 A at 108 V) from modest heat (400-450 deg C).
Principles
- Thermionic emission
- Thermoelectric (Seebeck) effect
- Negative resistance in pulsed discharge
- Solid-state switching and capacitor charging
Scientific Domains
Materials
- Stainless steel
- Graphite
- Barium oxide
- Strontium oxide
- Calcium oxide
- Silicon carbide
- Carbon
- Tungsten
- Aluminum oxide
- Ceramic (insulator support, housing, seals)
Mechanisms of Action
- Electron emission from heated cathode surface
- Voltage generation by SiC-carbon thermocouples
- Positive bias from thermopile to enhance emission
- Pulsed switching to transfer energy to external capacitors
Energy Sources
Applications
- Electric vehicles
- Residential backup power
- Hospital emergency power
Claimed Performance
200 A at 108 V (~=21.6 kW) from a pair of generators heated to 400-450 deg C; earlier claim of a 20 kW output from a single pair of tubes.
Experimental Evidence
The article describes an actually constructed and operated device with the dimensions and component counts given, and states that currents of 200 A at 108 V are possible under the specified heating conditions.
Limitations
- Requires sustained heat of 400-450 deg C
- Needs high-vacuum sealed cylinder assembly
- Performance claims lack independent verification
- Potential violation of known thermodynamic limits
Red Flags
- Claims that violate conventional thermodynamics
- No peer-reviewed or independently replicated data
- Overunity-type performance statements