Ionized Fluid Heat-to-Electric Conversion Beyond Space-Charge Limits
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Solution Overview
Problem
Current technologies for converting thermal energy into electrical energy, such as thermoelectric power generation, electro-hydrodynamics, and thermionic generators, suffer from low efficiency due to limitations in electron capacity and space-charge constraints, making them inefficient for direct heat-to-electric energy transformation.
Innovation Solution
A device utilizing a container filled with a fluid that accepts electrons, a cathode emitting electrons, and an anode that accepts these electrons, with a heat sink to transfer ambient heat and generate an electric field, allowing for the direct conversion of thermal energy into electrical energy through the diffusion of ionized particles against the electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If thermoelectric power generation based on the Seebeck Effect is used to convert thermal energy into electrical energy, then electrical power can be generated from heat, but the conversion efficiency is very low (about 10%)
Solution Approach 1:
The patent introduces an ionized gas as an intermediary medium between the heat source and the electrical energy generation process. The gas particles absorb thermal energy, become ionized, and transport charge through the gas phase, enabling more efficient energy conversion compared to direct solid-state thermoelectric conversion.
Solution Approach 2:
The patent changes the physical state of the working medium from solid (in thermoelectric generators) to ionized gas phase. This parameter change allows for better thermal energy absorption and charge transport, significantly improving conversion efficiency beyond the 10% limitation of conventional thermoelectric materials.
2Use of energy by moving object
If thermionic generators are used to transform thermal energy to electric energy, then electrons can be emitted from a hot cathode, but the space-charge limit restricts electron density and current flow, reducing efficiency
Solution Approach 1:
The patent uses an ionized gas medium instead of vacuum or direct electron emission. The gas-phase ion transport mechanism replaces the vacuum-based electron flow in thermionic generators, eliminating space-charge limitations and enabling higher current densities through diffusion and drift of ionized particles.
3Power
If electro-hydrodynamics or magneto-hydrodynamics are used for power generation, then charged particles can be moved by electric or magnetic fields, but these systems use energy from fluid streams rather than heat, making them unsuitable for direct heat-to-electric conversion
Solution Approach 1:
The patent creates a system that combines the advantages of thermal energy absorption with charge transport. The ionized gas medium serves dual functions: absorbing thermal energy from heat sources and enabling electrical energy generation through ion drift and diffusion, making the system adaptable to direct heat-to-electric conversion applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly enhances the efficiency of thermal-to-electrical energy conversion by leveraging the kinetic energy of particles to generate electric energy, reducing gas temperature and effectively transforming heat into usable electrical power.
Implementation Method 1
a heatsink transfers ambient heat to the gas
Implementation Method 2
a cathode that emits electrons to the gas
Implementation Method 3
an electric field is established that pushes the ionized particles towards the cathode and away from the anode
Implementation Method 4
particles move in space and hit each other permanently. With a certain probability, particles move a certain distance towards the anode. Also with a certain probability, an ion may hit a neutral particle and transfer its electron to the neutral particle. Both, movement and electron transfer, create a diffusion effect that transports the charges against the force of the electric field
Implementation Method 5
an anode that accepts electrons from the fluid
Data Source
Figure 1
Figure 2~3
AI summary
Devices and methods are provided for transformation of thermal energy directly into electrical energy. A fluid having particles adapted to accept and emit electrons is accommodated in a container. At the container, a cathode is configured to emit electrons, wherein the particles of the fluid accept electrons emitted by the cathode, and an anode is configured to accept electrons, wherein the particles of the fluid emit electrons accepted by the anode. Further, a heat transfer unit is configured to exchange heat with the fluid so that the particles of the fluid are accelerated, and an electric field generator is configured to generate an electric field so that negatively charged particles of the fluid are driven in a direction towards the cathode, while positively charged particles are driven towards the anode. In such an arrangement, kinetic energy can be transformed directly into electrical energy.