Thermionic Converter Reservoir and Getters for Space Charge Control
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Solution Overview
Problem
Existing energy converter systems face challenges in efficiently converting thermal energy to electrical energy, particularly due to high space charge effects and undesired species that affect efficiency and longevity, and there is a need for improved thermal management and work function modification in thermionic energy converters.
Innovation Solution
The system employs thermionic energy converters with a novel design incorporating a collector body with a reservoir containing porous capture materials to store work function modification materials, such as cesium, and getters to manage undesired species, along with a conduit system to maintain optimal vacuum conditions, enhancing thermal energy conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermionic energy converters are used to convert thermal energy to electrical energy, then energy conversion is achieved, but space charge effects reduce efficiency
Solution Approach 1:
The patent extracts and removes undesired species (including space charge) from the converter environment using getters. The getter materials are specifically designed to absorb and remove charged particles that create space charge effects, thereby improving energy conversion efficiency by eliminating this harmful factor.
Solution Approach 2:
The patent modifies the work function of the emitter surface by introducing alkali metal species (such as cesium) that change the surface properties. This parameter change reduces the energy barrier for electron emission, increasing current density and improving overall conversion efficiency while managing space charge through controlled vapor pressure.
2Productivity
If work function modification materials like cesium are used to improve emission, then electron emission efficiency increases, but cesium vapor pressure creates harmful effects
Solution Approach 1:
The patent employs porous getter materials with high surface area to volume ratios. These porous structures provide extensive adsorption sites for cesium vapor, effectively reducing cesium vapor pressure in the converter while maintaining the beneficial work function modification effects on the emitter surface.
Solution Approach 2:
The patent converts the harmful high vapor pressure of cesium into a beneficial controlled low vapor pressure environment. By using getters to adsorb excess cesium vapor, the system maintains optimal cesium coverage on the emitter for work function modification while eliminating the harmful effects of high vapor pressure, such as condensation and performance degradation.
3Reliability
If getters are added to remove undesired species, then converter longevity improves, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the getter component: it serves as both a vacuum maintenance element and a species removal mechanism. The getter simultaneously removes undesired species, manages cesium vapor pressure, and protects converter components, thereby improving longevity without proportionally increasing complexity.
Solution Approach 2:
The getter materials are designed to automatically adsorb and remove undesired species from the converter environment without requiring external control systems. This self-service mechanism passively maintains optimal operating conditions and extends converter life while adding minimal structural complexity.
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 design significantly reduces space charge effects and undesired species, improving the efficiency and longevity of thermionic energy converters by maintaining optimal vacuum conditions and reducing cesium vapor pressures, thereby enhancing thermal-to-electrical energy conversion.
Implementation Method 1
a reservoir (115) containing porous capture materials to store work function modification materials like cesium
Implementation Method 2
converting thermal energy to electrical energy (e.g., at the TECs, via thermionic emission)
Implementation Method 3
along with getters to remove undesired species
Data Source
AI summary
An energy converter system, preferably including one or more thermionic energy converters (TECs), and optionally including an electrical power converter. A TEC, preferably including a collector body, an emitter body, and a seal. A method of operation for an energy converter system, preferably including providing a heat source; converting thermal energy to electrical energy; and/or providing one or more electrical energy outputs.