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The material outlines performance and degradation targets, design requirements for minimum EODL power under deep-space conditions, technology upgrades such as replacing thermoelectric components and increasing hot-junction temperatures, and the staged RPS technology maturation 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thermal and electrical limits.",{"name":70,"@type":61,"acceptedAnswer":71},"How does the presentation propose to enhance performance after replacing thermoelectric materials?",{"text":72,"@type":64},"It calls for replacing the PbTe with SKD in the 48-couple module, adding aerogel insulation for sublimation suppression, and raising hot-junction temperatures to realize the benefit while managing higher operating temperatures across components.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},159138,1788013428,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,105,110,115,120,123,127],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & 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Development and Infusion  \nOctober 2018  \nJoe Giglio, Chris Matthes  \nINL is a U.S. Department of Energy National Laboratory operated by Battelle Energy Alliance, LLC  \nDISCLAIMER  \nThis information was prepared as an account of work sponsored by an agency of the U.S. Government. Neither the U.S. Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness, of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. References herein to any specific commercial product, process, or service by trade name, trade mark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the U.S. Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the U.S. Government or any agency thereof.  \nINL/CON-18-51605-Revision-0  \n2018 Conference on Advanced Power Systems for Deep Space Exploration presentation-eMMRTG Development and Infusion  \nJoe Giglio, Chris Matthes  \nOctober 2018  \nIdaho National Laboratory  \nIdaho Falls, Idaho 83415  \n[http://www.inl.gov](http://www.inl.gov)  \nPrepared for the  \nU.S. Department of Energy  \nUnder DOE Idaho Operations Office  \nContract DE-AC07-05ID14517  \neMMRTG Development and Infusion  \nOctober 22, 2018  \nJoe Giglio  \n[joe.giglio@inl.gov](joe.giglio@inl.gov)  \nIdaho National Laboratory  \nChris Matthes  \n[christopher.s.matthes@jpl.nasa.gov](christopher.s.matthes@jpl.nasa.gov)  \nMulti-Mission Radioisotope Thermoelectric Generator (MMRTG)  \n• The MMRTG converts heat generated from the natural decay of Pu-238 (alpha emitter) to  \nelectricity through the thermoelectric effect.  \nTerminology  \nBOL-Beginning of Life  \nBOM-Beginning of Mission EODL – End of Design Life  \nMissions  \nMars Science Laboratory Mars 2020  \nPotential Mission Dragonfly  \n•  \n•  \n•  \n•  \nSealed thermoelectric cavity which allows planetary (atmosphere capable) and deep space use  \nBased on 1970 era thermoelectric materials ( PbTe/TAGS)  \nUses the General Purpose Heat Source (GPHS)  \nTotal power degradation is ~4 .8%/year  \n– Fuel decay ~1 . 1%  \nEnhancing the MMRTG – Replacing the TE with State ofthe Art  \nTechnology  \nRequirement:  \nMinimum EODL power of 77 W accounting for all degradation mechanisms when operated at nominal deep space conditions with minimum fuel load (1952 W BOL), fin root temperature of 157 °C and load voltage of 34 V.  \nMinimize changes to a TRL-9 generator  \n• Replace the PbTe with SKD in the 48 couple module  \n– Includes Aerogel insulation for sublimation suppression  \n• Need to increase the hot junction operating temperature to realize enough benefit for the change  \n• Increases the operating temperatures from the TE to the fuel  \n– Duplicate the emissive coating on the outside of the liner on the inside surface to lower the fuel temperature  \n– Requires the fuel support structure to operate hotter than the MMRTG  \n\n|  | MMRTG | eMMRTG |\n| --- | --- | --- |\n| Power, launch, W | 110 | 140 (goal) |\n| Efficiency, BOL | 5.5% | 7.5% |\n| Power, EODL, W | 55 | 77 |\n| Degradation rate, avg | 4.8% | 2.5% |\n| \\# GPHSs | 8 | 8 |\n| Length, m | 0.69 | 0.69 |\n| Mass, kg | 45 | 44 |\n\n[www.rps.nasa.gov](www.rps.nasa.gov) 3  \nRPS Technology Maturation Process  \neMMRTG Status  \n• Approaching Gate 2 (January 2019)– Initial Life and Performance Assessment vs Requirements, Production Capabilities  \n– SKD material fabrication transitioned from JPL to Teledyne Energy Systems (TESI) .  \n– 2 couple configurations (metallization layers) currently on test to characterize temperature dependent degradation rates.  \n• Expect 3000+ hour test data in a variety conditions  \n– Demonstrating manufac","cbCaifJjzipliP6c","https://ap.wps.com/l/cbCaifJjzipliP6c","pdf",2356867,"English","# eMMRTG Development and Infusion\n## MMRTG fundamentals and terminology\n## Missions and design requirements\n## Enhancing MMRTG with state-of-the-art technology\n## eMMRTG comparison and status\n## RPS technology maturation process\n## eMMRTG design process and thermoelectric selection","[{\"question\":\"What is the key difference between MMRTG and eMMRTG described in the presentation?\",\"answer\":\"The presentation frames eMMRTG as an enhanced design aiming for higher efficiency and lower degradation, primarily by replacing the thermoelectric elements with state-of-the-art technology and adjusting operating temperatures.\"},{\"question\":\"What minimum power requirement does the eMMRTG design case target?\",\"answer\":\"It targets a minimum EODL power of 77 W after accounting for all degradation mechanisms under nominal deep-space operating conditions with a stated minimum fuel load and specified thermal and electrical limits.\"},{\"question\":\"How does the presentation propose to enhance performance after replacing thermoelectric materials?\",\"answer\":\"It calls for replacing the PbTe with SKD in the 48-couple module, adding aerogel insulation for sublimation suppression, and raising hot-junction temperatures to realize the benefit while managing higher operating temperatures across components.\"}]","2018 Conference on Advanced Power Systems for Deep Space Exploration - eMMRTG Development and Infusion | PDF",33]