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Optimal thermionic energy conversion with established electrodes for high-temperature topping and process heating. [coal combustion product environments
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Morris, J. F. |
| Copyright Year | 1980 |
| Description | Applied research-and-technology (ART) work reveals that optimal thermionic energy conversion (TEC) with approximately 1000 K to approximately 1100 K collectors is possible using well established tungsten electrodes. Such TEC with 1800 K emitters could approach 26.6% efficiency at 27.4 W/sq cm with approximately 1000 K collectors and 21.7% at 22.6 W/sq cm with approximately 1100 K collectors. These performances require 1.5 and 1.7 eV collector work functions (not the 1 eV ultimate) with nearly negligible interelectrode losses. Such collectors correspond to tungsten electrode systems in approximately 0.9 to approximately 6 torr cesium pressures with 1600 K to 1900 K emitters. Because higher heat-rejection temperatures for TEC allow greater collector work functions, interelectrode loss reduction becomes an increasingly important target for applications aimed at elevated temperatures. Studies of intragap modifications and new electrodes that will allow better electron emission and collection with lower cesium pressures are among the TEC-ART approaches to reduced interelectrode losses. These solutions will provide very effective TEC to serve directly in coal-combustion products for high-temperature topping and process heating. In turn this will help to use coal and to use it well. |
| File Size | 1468290 |
| Page Count | 38 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800024713 |
| Archival Resource Key | ark:/13960/t2p60cq6g |
| Language | English |
| Publisher Date | 1980-07-01 |
| Access Restriction | Open |
| Subject Keyword | Plasma Physics Electrodes Coal Utilization Cogeneration Stirling Cycle Thermionic Power Generation Tungsten Combustion Products Boilers Cesium Energy Policy High Temperature Environments Energy Conversion Efficiency Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
