Download or read book Design Analysis and Optimization of a Radioisotope Thermophotovoltaic RTPV Generator and Its Applicability to an Illustrative Space Mission written by and published by . This book was released on 1994 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paper presented at the 45th Congress of the IAF in Jerusalem, Israel, October 1994. The paper describes the results of a DOE-sponsored design study of a radioisotope thermophotovoltaic generator (RTPV), to complement similar studies of Radioisotope Thermoelectric Generators (RTGs) and Stirling Generators (RSGs) previously published by the authors. To focus the design effort, it was decided to direct it at a specific illustrative space mission, Pluto Fast Flyby (PFF). That mission, under study by the JPL, envisages a direct eight to nine-year flight to Pluto (the only unexplored planet in the solar system), followed by comprehensive mapping, surface composition, and atmospheric structure measurements during a brief flyby of the planet and its moon Charon, and transmission of the recorded science data to Earth during a six-week post-encounter cruise.
Download or read book Analysis Optimization and Assessment of Radioisotope Thermophotovoltaic System Design for an Illustrative Space Mission written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A companion paper presented at this conference described the design of a Radioisotope Thermophotovoltaic (RTPV) Generator for an illustrative space mission (Pluto Fast Flyby). It presented a detailed design of an integrated system consisting of a radioisotope heat source, a thermophotovoltaic converter, and an optimized heat rejection system. The present paper describes the thermal, electrical, and structural analyses which led to that optimized design, and compares the computed RTPV performance to that of a Radioisotope Thermoelectric Generator (RTG) designed for the same mission. RTPV's are of course much less mature than RTGs, but our results indicate that - when fully developed - they could result in a 60% reduction of the heat source's mass, cost, and fuel loading, a 50% reduction of generator mass, a tripling of the power system's specific power, and a quadrupling of its efficiency. The paper concludes by briefly summarizing the RTPV's current technology status and assessing its potential applicability for the PFF mission. For other power systems (e.g. RTGs), demonstrating their flight readiness for a long mission is a very time-consuming process to determine the long-term effect of temperature-induced degradation mechanisms. But for the case of the described RTPV design, the paper lists a number of factors, primarily its cold (0 to 10 degrees C) converter temperature, that may greatly reduce the need for long-term tests to demonstrate generator lifetime. In any event, our analytical results suggest that the RTPV generator, when developed by DOE and/or NASA, would be quite valuable not only for the Pluto mission but also for other future missions requiring small, long-lived, low mass generators. Another copy is in the Energy Systems files.
Download or read book Radioisotope Thermophotovoltaic RTPV Generator and Its Applicability to an Illustrative Space Mission written by and published by . This book was released on 1994 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper describes the results of a DOE-sponsored design study of a radioisotope thermophotovoltaic generator (RTPV), to complement similar studies of Radioisotope Thermoelectric Generators (RTGs) and Stirling Generators (RSGs) previously published by the author. Instead of conducting a generic study, it was decided to focus the design effort by directing it at a specific illustrative space mission, Pluto Fast Flyby (PFF). That mission, under study by JPL, envisages a direct eight-year flight to Pluto (the only unexplored planet in the solar system), followed by comprehensive mapping, surface composition, and atmospheric structure measurements during a brief flyby of the planet and its moon Charon, and transmission of the recorded science data to Earth during a post-encounter cruise lasting up to one year.
Download or read book Radioisotope Thermophotovoltaic RTPV Generator and Its Application to the Pluto Fast Flyby Mission written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the results of a DOE-sponsored design study of a radioisotope thermophotovoltaic generator. Instead of conducting a generic study, it was decided to focus the design by directing it at a specific space mission, Pluto Fast Flyby (PFF). That mission, under study by JPL, envisages a direct eight-year flight to Pluto (the only unexplored planet in the solar system), followed by comprehensive mapping, surface composition, and atmospheric structure measurements during a brief flyby of the planet and its moon Charon, and transmission of the recorded science data to Earth during a one-year post-encounter cruise. Because of Pluto's long distance from the sun (30-50 A.U.) and the mission's large energy demand, JPL has baselined the use of a radioisotope power system for the PFF spacecraft. The chief advantage of Radioisotope Thermophotovoltaic (RTPV) power systems over current Radioisotope Thermoelectric Generators (RTGs) is their much higher conversion efficiency, which greatly reduces the mass and cost of the required radioisotope heat source. Those attributes are particularly important for the PFF mission, which - like all NASA missions under current consideration - is severely mass- and cost-limited. The paper describes the design of the radioisotope heat source, the thermophotovoltaic converter, and the heat rejection system; and presents the results of the thermal, electrical, and structural analysis and the design optimization of the integrated RTPV system. It briefly summarizes the RTPV system's current technology status, and lists a number of factors that my greatly reduce the need for long-term tests to demonstrate generator lifetime. Our analytical results show very substantial performance improvements over an RTG designed for the same mission, and suggest that the RTPV generator, when developed by DOE and/or NASA, would be quite valuable not only for the PFF mission but also for other future missions requiring small, long-lived, low-mass generators. There is a duplicate copy.
Download or read book Design Analysis and Optimization of a Radio isotrope Thermo photovoltaic RTPV Generator and Its Applicability to an Illustrative Space Mission written by A. Schock and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermophotovoltaics written by Thomas Bauer and published by Springer Science & Business Media. This book was released on 2011-06-17 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermophotovoltaics is the science and technology associated with the direct generation of electricity from high temperature heat. Potential applications include combined heat and power, portable and auxiliary power, radioisotope space power, industrial waste heat recovery and concentrated solar power. This book aims at serving as an introduction to the underlying theory, overview of present day components and system arrangements, and update of the latest developments in the field. The emphasis is placed on the understanding of the critical aspects of efficient thermophotovoltaic system design. The aim is to assist researchers in the field.
Download or read book Second NREL Conference on Thermophotovoltaics written by David S. Ginley and published by American Institute of Physics. This book was released on 2000-04-14 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Thermophotovoltaic (TPV) Energy Converters generate electricity by photovoltaic conversion of photons emitted from a radiant heat source. A wide range of fuels can drive the heat source, and the technology supports a diverse range of potential applications. The proceedings of the July 1995 conference, sponsored by the National Renewable Energy Laboratory (NREL) under contract to the US Dept. of Energy, include sessions on thermophotovoltaic systems design and performance; markets and applications; optical system development; TPV cells (two sessions--one devoted to InGaAs cells); and emitter design and testing. No index. Annotation c. by Book News, Inc., Portland, Or.
Download or read book Rectenna Solar Cells written by Garret Moddel and published by Springer Science & Business Media. This book was released on 2013-09-16 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rectenna Solar Cells discusses antenna-coupled diode solar cells, an emerging technology that has the potential to provide ultra-high efficiency, low-cost solar energy conversion. This book will provide an overview of solar rectennas, and provide thorough descriptions of the two main components: the diode, and the optical antenna. The editors discuss the science, design, modeling, and manufacturing of the antennas coupled with the diodes. The book will provide concepts to understanding the challenges, fabrication technologies, and materials required to develop rectenna structures. Written by experts in their specialized fields.
Download or read book Space Technology Applications International Forum STAIF 96 written by Mohamed S. El-Genk and published by A I P Press. This book was released on 1996 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermophotovoltaic Generation of Electricity written by Ashok Gopinath and published by American Institute of Physics. This book was released on 2004-12-07 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermophotovoltaic (TPV) technology is a promising new means for the direct conversion of thermal to electric energy. This conference volume presents a broad range of peer-reviewed papers on various potential and current applications.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the 31st Intersociety Energy Conversion Engineering Conference written by and published by . This book was released on 1996 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermophotovoltaic Generation of Electricity written by Timothy J. Coutts and published by American Institute of Physics. This book was released on 1999-03-18 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermophotovoltaic technology has re-emerged during the last 8 years as being of potential importance for a wide variety of applications in both the military and non-military areas. The NREL TPV Conferences (of which there have been four) attract a diversity of scientists and engineers from all aspects of the technology, from the semiconductor converters to complete systems incorporating heat recuperation and photon recirculation. This book contains virtually all the papers presented at the 4th NREL TPV Conference: the presenters all being specialists in the field. This is the only source of complete state-of-the-art information on the subject. It also contains reviews of the seven individual sessions, prepared by the Session Chairs.
Download or read book Space Technology and Applications International Forum 1998 written by S. El-Genk and published by American Inst. of Physics. This book was released on 1998 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Thermophotovoltaic Cells Modeling Optimized for Use in Radioisotope Thermoelectric Generators RTGs for Mars and Deep Space Missions written by Bradley P. Davenport and published by . This book was released on 2004-06-01 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: To accommodate the need for power on deep space missions, satellites must carry a source capable of providing adequate power for the life of the mission. This is currently done using radioisotope thermoelectric generators (RTGs). Current RTGs consist of a heat source, Pu-238, and a thermocouple that inefficiently converts heat into electricity. To improve the overall efficiency of RTGs, a better thermoelectric converter is needed to replace the thermocouple. This thesis examines the possible use of thermophotovoltaic (TPV) cells in RTGs. Two cells were developed and optimized for the spectrum from a 1300K blackbody that simulates the spectrum of an RTG heat source. Current TPV cells are built and tested with different thicknesses and doping levels to the most efficient design, an expensive and time-consuming method. This thesis presents a model that can predict the output of a cell under various spectra. The model can easily be changed to simulate different cell thicknesses and doping levels, and it can be changed to simulate cells of different materials. The models presented in this thesis were built using the Silvaco Virtual Wafer Fabrication software package. To prove the capabilities of this software package in designing TPV models, an initial cell was designed using a well-documented material: gallium arsenide (GaAs). Voltage-current characteristics and frequency response data were recorded from this model and compared with experimental data from a similar cell. Once the model was verified, more exotic materials could be examined: gallium antimonide (GaSb) and indium gallium arsenide (InGaAs). As with the GaAs cell model, the GaSb and InGaAs models were first optimized for the AM0 spectrum and compared to experimental results. Programs were written using Matlab to run iterations of Silvaco to change layer thicknesses and doping levels. Other programs also were used to help determine the most efficient TPV cell design. (41 figures, 48 refs.)
Download or read book Proceedings of the Intersociety Energy Conversion Engineering Conference written by and published by . This book was released on 1996 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Technology and Applications International Forum STAIF 2005 written by Mohamed S. El-Genk and published by American Institute of Physics. This book was released on 2005-03-03 with total page 1512 pages. Available in PDF, EPUB and Kindle. Book excerpt: 3rd Symposium on Space Colonization. 2nd Symposium on New Frontiers and Future Concepts, Albuquerque, New Mexico, 13-17 February 2005
