{"id":587267,"date":"2024-01-04T13:03:17","date_gmt":"2024-01-04T18:03:17","guid":{"rendered":"https:\/\/www.nasa.gov\/?p=587267"},"modified":"2024-01-04T13:03:18","modified_gmt":"2024-01-04T18:03:18","slug":"electro-luminescently-cooled-zero-boil-off-propellant-depots","status":"publish","type":"post","link":"https:\/\/www.nasa.gov\/general\/electro-luminescently-cooled-zero-boil-off-propellant-depots\/","title":{"rendered":"Electro-luminescently Cooled Zero-boil-off Propellant Depots Enabling Crewed Exploration of Mars"},"content":{"rendered":"<div id=\"\" class=\"padding-top-5 padding-bottom-3 width-full maxw-full hds-module hds-module-full wp-block-nasa-blocks-article-intro\"><div class=\"width-full maxw-full article-header\"><div class=\"margin-bottom-2 width-full maxw-full\"><p class=\"label carbon-60 margin-0 margin-bottom-3 padding-0\">3 min read<\/p><h1 class=\"display-48 margin-bottom-2\">Electro-luminescently Cooled Zero-boil-off Propellant Depots Enabling Crewed Exploration of Mars<\/h1><\/div><\/div><\/div>\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-cover \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png\"><img fetchpriority=\"high\" decoding=\"async\" width=\"2048\" height=\"1142\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?w=2048\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Artist rendition of labeled diagram Electro-luminescently cooled zero-boil-off propellant depots\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png 2454w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=300,167 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=768,428 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=1024,571 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=1536,856 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=2048,1142 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=400,223 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=600,334 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=900,502 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=1200,669 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?resize=2000,1115 2000w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" loading=\"eager\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">Graphic depiction of Electro-luminescently cooled zero-boil-off propellant depots enabling crewed exploration of Mars <\/div><div class=\"hds-credits\">Aaswath Pattabhi Raman<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p><strong>Aaswath Pattabhi Raman<\/strong><br><em>University of California, Los Angeles<\/em><\/p>\n\n\n\n<p>Exploration of Mars has captivated the public in recent decades with high-profile robotic missions and the images they have acquired seeding our collective imagination. NASA is actively planning for human exploration of Mars and laid out some of the key capabilities that must be developed to execute successful, cost-effective programs that would put human beings on the surface of another planet and bring them home safely. One crucial area where new missions and enabling technologies are needed is the long-duration storage of cryogenic propellants in various space environments; relevant propellants include liquid Hydrogen (LH2) for high specific impulse Nuclear Thermal Propulsion (NTP) which can be deployed in strategic locations in advance of a mission. Such LH2 storage tanks could be used to refill a crewed Mars Transfer Vehicle (MTV) to send and bring astronauts home quickly, safely, and cost-effectively.<\/p>\n\n\n\n<p>We propose a breakthrough mission concept: a cryogenic liquid storage depot capable of storing LH2 with ZBO even in the severe and fluctuating thermal environment of LEO. Our innovative storage depot mission employs thin, lightweight, all-solid-state panels attached to the tank\u2019s deep-space-facing surfaces that utilize a long-understood but as-yet-unrealized cooling technology known as Electro-Luminescent Cooling (ELC) to reject heat from cold solid surfaces as non-equilibrium thermal radiation with orders of magnitude more power density than Planck\u2019s Law permits for equilibrium thermal radiation. Such a depot and tank would drastically lower the cost and complexity of propulsion systems for crewed Mars missions and other deep space exploration by allowing spacecraft to refill propellant tanks after reaching orbit rather than launching on the much larger rocket required to lift the spacecraft in a single-use stage. To achieve ZBO, a storage spacecraft must keep the storage tank\u2019s temperature below the boiling point of the cryogen<\/p>\n\n\n\n<p>(e.g., \u224820 K for liquid H2). Achieving this in LEO-like thermal environments requires both excellent reflectivity toward sunlight and thermal radiation from the Earth and other nearby bodies as well as a power-efficient cooling mechanism to remove what little heat inevitably does leak in, a pair of conditions ideally suited to the the ELC panel concept that enables our mission. By enabling ZBO LH2 storage in LEO, our mission will enable cost-effective, and flexible crewed exploration of Mars. Our mission will also demonstrate capabilities with ancillary benefits to cryogenic storage in terrestrial applications and solid-state cooling technologies more generally.<\/p>\n\n\n\n<p><strong><a href=\"\/general\/niac-2024-selections\">2024 Phase I Selection<\/a><\/strong><\/p>\n\n\n<div id=\"\" class=\"hds-topic-cards nasa-gb-align-full maxw-full width-full padding-y-6 padding-x-3 color-mode-dark hds-module hds-module-full wp-block-nasa-blocks-topic-cards\">\t\t<div class=\"grid-container grid-container-block-lg padding-x-0\">\n\t\t\t<div class=\"grid-row flex-align-center margin-bottom-3\">\n\t\t\t\t<div class=\"desktop:grid-col-8 margin-bottom-2 desktop:margin-bottom-0\">\n\t\t\t\t\t<div class=\"label color-carbon-60 margin-bottom-2\">Keep Exploring<\/div>\n\t\t\t\t\t<h2 class=\"heading-36 line-height-sm\">Discover More NIAC Topics<\/h2>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t<div class=\"grid-row grid-gap-2 hds-topic-cards-wrapper\">\n\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/space-technology-mission-directorate\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>Space Technology Mission Directorate<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"525\" height=\"800\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/12\/stmd.jpg?w=525\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/12\/stmd.jpg 525w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/12\/stmd.jpg?resize=197,300 197w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/12\/stmd.jpg?resize=263,400 263w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/12\/stmd.jpg?resize=394,600 394w\" sizes=\"(max-width: 525px) 100vw, 525px\" \/><\/figure>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/stmd-the-nasa-innovative-advanced-concepts-niac\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>NASA Innovative Advanced Concepts<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"1041\" height=\"521\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/12\/niac_magnetosphere.png?w=1041\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); 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transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png 4053w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=300,92 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=768,236 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=1024,315 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=1536,473 1536w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=2048,630 2048w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=400,123 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=600,185 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=900,277 900w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=1200,369 1200w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2022\/02\/2022_niac_ph_i_ii_selections_web_graphic_banner_final_v2.png?resize=2000,615 2000w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/about-niac\/\" class=\"mobile:grid-col-12 tablet:grid-col-6 desktop:grid-col-3 topic-card margin-bottom-4 desktop:margin-bottom-0\">\n\t\t\t\t<div class=\"hds-topic-card hds-cover-wrapper cover-hover-zoom bg-carbon-black\">\n\t\t\t\t\t<div class=\"skrim-overlay skrim-overlay-dark skrim-left mobile-skrim-top padding-3 display-flex flex-align-end flex-justify-start z-200\">\n\t\t\t\t\t\t<div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"hds-topic-card-heading heading-29 color-spacesuit-white line-height-sm margin-top-0 margin-bottom-1\">\n\t\t\t\t\t\t\t\t<span>About NIAC<\/span>\n\t\t\t\t\t\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"color-nasa-red\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg>\n\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"649\" height=\"766\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2019\/09\/niac_2019_howe_troy.png?w=649\" class=\"attachment-1536x1536 size-1536x1536\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2019\/09\/niac_2019_howe_troy.png 649w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2019\/09\/niac_2019_howe_troy.png?resize=254,300 254w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2019\/09\/niac_2019_howe_troy.png?resize=339,400 339w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2019\/09\/niac_2019_howe_troy.png?resize=508,600 508w\" sizes=\"(max-width: 649px) 100vw, 649px\" \/><\/figure>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Aaswath Pattabhi RamanUniversity of California, Los Angeles Exploration of Mars has captivated the public in recent decades with high-profile robotic missions and the images they have acquired seeding our collective imagination. NASA is actively planning for human exploration of Mars and laid out some of the key capabilities that must be developed to execute successful, […]<\/p>\n","protected":false},"author":66,"featured_media":587270,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"66","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"","nasa_hds_core_meta_linked_locations":[],"nasa_hds_core_meta_article_related_articles":[],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"footnotes":""},"categories":[1],"news-tags":[],"internal-terms":[9529,12691],"coauthors":[8624],"parsely":{"version":"1.1.0","meta":{"@context":"https:\/\/schema.org","@type":"NewsArticle","headline":"Electro-luminescently Cooled Zero-boil-off Propellant Depots Enabling Crewed Exploration of Mars","url":"https:\/\/www.nasa.gov\/general\/electro-luminescently-cooled-zero-boil-off-propellant-depots\/","mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/www.nasa.gov\/general\/electro-luminescently-cooled-zero-boil-off-propellant-depots\/"},"thumbnailUrl":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?w=150&h=150&crop=1","image":{"@type":"ImageObject","url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png"},"articleSection":"General","author":[{"@type":"Person","name":"Loura Hall"}],"creator":["Loura Hall"],"publisher":{"@type":"Organization","name":"NASA","logo":"https:\/\/www.nasa.gov\/wp-content\/themes\/nasa\/assets\/images\/nasa-logo.svg"},"keywords":["General"],"dateCreated":"2024-01-04T18:03:17Z","datePublished":"2024-01-04T18:03:17Z","dateModified":"2024-01-04T18:03:18Z"},"rendered":"<meta name=\"parsely-title\" content=\"Electro-luminescently Cooled Zero-boil-off Propellant Depots Enabling Crewed Exploration of Mars\" \/>\n<meta name=\"parsely-link\" content=\"https:\/\/www.nasa.gov\/general\/electro-luminescently-cooled-zero-boil-off-propellant-depots\/\" \/>\n<meta name=\"parsely-type\" content=\"post\" \/>\n<meta name=\"parsely-image-url\" content=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png?w=150&h=150&crop=1\" \/>\n<meta name=\"parsely-pub-date\" content=\"2024-01-04T18:03:17Z\" \/>\n<meta name=\"parsely-section\" content=\"General\" \/>\n<meta name=\"parsely-tags\" content=\"General\" \/>\n<meta name=\"parsely-author\" content=\"Loura Hall\" \/>","tracker_url":"https:\/\/cdn.parsely.com\/keys\/nasa.gov\/p.js"},"read_time":3,"time_ago":"5 months","featured_image":{"id":587270,"file":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/01\/2024-ph-i-pattabhi-raman-graphic.png","title":"NIAC 2024 Raman","alt":"Artist rendition of labeled diagram Electro-luminescently cooled zero-boil-off propellant depots","caption":"Graphic depiction of Electro-luminescently cooled zero-boil-off propellant depots enabling crewed exploration of Mars "},"_links":{"self":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/587267"}],"collection":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/users\/66"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/comments?post=587267"}],"version-history":[{"count":2,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/587267\/revisions"}],"predecessor-version":[{"id":587951,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/587267\/revisions\/587951"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media\/587270"}],"wp:attachment":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media?parent=587267"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/categories?post=587267"},{"taxonomy":"news-tags","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/news-tags?post=587267"},{"taxonomy":"internal-terms","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/internal-terms?post=587267"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/coauthors?post=587267"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}