{"id":714,"date":"2012-11-07T10:12:00","date_gmt":"2012-11-07T09:12:00","guid":{"rendered":"https:\/\/kids.esa.int\/from_rocket_fuel_to_clean_cars\/"},"modified":"2026-10-08T00:31:27","modified_gmt":"2026-10-07T22:31:27","slug":"from_rocket_fuel_to_clean_cars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/from_rocket_fuel_to_clean_cars\/","title":{"rendered":"Fra raketbr\u00e6ndstof til milj\u00f8venlige biler"},"content":{"rendered":"<div class=\"lede\">\n<p>Brint, den letteste af alle gasser, er det mest udbredte grundstof i universet. Det er ekstremt letant\u00e6ndeligt, hvis der er ilt til stede. Brint, der anvendes i Europas Ariane 5-raketter, er et fremragende raketbr\u00e6ndstof, men det er meget sv\u00e6rt at opbevare. Det skal opbevares i dobbeltv\u00e6ggede tanke ved meget lave temperaturer og derefter ledes til raketmotorerne gennem t\u00e6t forseglede r\u00f8r.<\/p>\n<\/div>\n<p>De seneste fremskridt fra et \u00f8strigsk firma tyder p\u00e5, at brint ogs\u00e5 kan blive det foretrukne br\u00e6ndstof til fremtidens vejtransport og dermed l\u00f8se problemet med, hvordan man skaber milj\u00f8venlige biler. I samarbejde med den tyske bilproducent BMW har dette firma tilpasset raketteknologi til at udvikle brinttanke, der er sm\u00e5 nok til at passe i bagagerummet p\u00e5 en sedan. I 2007 f\u00f8rte dette til fremkomsten af en serieproduceret bil, BMW Hydrogen 7, som kan k\u00f8re p\u00e5 enten brint eller benzin. I praksis er den eneste udledning fra bilen harml\u00f8s vanddamp!<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"400\" data-credit=\"Magna Steyr Aerospace\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2012\/10\/Hydrogen_car_fuel_tank2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2012\/10\/hydrogen_car_fuel_tank2\/18250360-2-eng-GB\/Hydrogen_car_fuel_tank.jpg\" alt=\"Hydrogen car fuel tank\"><figcaption>Brintbilens br\u00e6ndstoftank<\/figcaption><\/figure>\n<p>En af de st\u00f8rste udfordringer var at designe br\u00e6ndstoftanken. For at kunne opbevares i flydende form skal brint holdes ved \u2013253 \u00b0C. I stedet for konstant k\u00f8ling opbevarer BMW Hydrogen 7-bilerne 114 liter flydende brint i st\u00e6rkt isolerede tanke. Tankernes isolering, der svarer til et 17 m tykt lag styropor, kan holde brintet koldt i n\u00e6sten to uger.<\/p>\n<p>Der er stadig nogle problemer, der skal l\u00f8ses, f\u00f8r brintdrevne biler bliver almindelige. Et af dem er manglen p\u00e5 tankstationer. Et andet er tabet af flydende brint, n\u00e5r det opvarmes og langsomt fordamper som gas. En bilist, der for eksempel efterlader sin bil i to uger i lufthavnen, vil vende tilbage til en tom br\u00e6ndstoftank. Der er dog tydelige tegn p\u00e5, at milj\u00f8venlige biler, der k\u00f8rer p\u00e5 brint, er fremtiden for forureningsfri bilk\u00f8rsel.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hydrogen, the lightest of all gases, is the most common element in the Universe. It is extremely easy to burn, if oxygen is present. Used in Europe\u2019s Ariane 5 launchers, [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2012\/10\/liquid_hydrogen-powered_combustion_engine2\/17879995-2-eng-GB\/Liquid_hydrogen-powered_combustion_engine.jpg","esa_banner_description":"Liquid hydrogen-powered combustion engine","esa_banner_credit":"BMW\/Magna Steyr Aerospace","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2012\/10\/Liquid_hydrogen-powered_combustion_engine2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,54,40],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-714","post","type-post","status-publish","format-standard","hentry","category-learn","category-space-technologies-on-earth","category-technology"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/714","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=714"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/714\/revisions"}],"predecessor-version":[{"id":4644,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/714\/revisions\/4644"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=714"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=714"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=714"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=714"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=714"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=714"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=714"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=714"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=714"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=714"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}