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Elon Musk'ın Yeni Hedefi: Atmosferdeki Karbondioksiti Yakıta Çevirmek! - HAKANSEYHAN
Time dergisi tarafınca kısa bir süre ilkin Senenin Kişisi seçilen Elon Musk , SpaceX’in atmosferdeki karbondioksiti roket yakıtına dönüştürmek için bir program başlattığını duyurdu. Şimdiye kadar verilen ayrıntıların oldukca azca bulunduğunu söyleyebiliriz, sadece Musk, atmosferik karbondioksitin eve dönüş yolculuklarına güç sağlamak için kullanılabilecek birkaç şeyden birini temsil ettiğini ve bu idealin “Mars için de mühim olacağını ” düşünüyor.
Musk “SpaceX, CO2’yi atmosferden alıp roket yakıtına dönüştürmek için bir program başlatıyor ” diyor ve ekliyor: “İlgileniyorsanız lütfen katılın. “
İnsanların nasıl “katılacağı” hemen hemen belli değil. Bu detay da, bu emek verme ile ilgili hemen hemen cevaplanmamış birçok sorudan yalnız biri.
Gezinsel uçuşların uzayın sınırına ulaşmış olması, bu tür görevlerin atmosfere verdiği zararın eleştirilmesine yol açtı. Blue Origin yada Virgin Galactic ‘in aksine SpaceX , NASA’nın araştırmalarına sağlamış olduğu yardımlar ile insanlığın yüzde birlik ufak bir parçasından daha çok yarar sağlaması yardımıyla bu eleştirilerden birazcık korunuyor.
Gene de, bir SpaceX roketi her havalandığında salınan çok önemli miktarlardaki karbondioksit, Musk’ın Tesla vasıtasıyla karada fosil yakıtları bitirme çabalarına pek uymuyor.
Mars görevlerinin kıymetli olduğu kati. Başka bir gezegene gidiş – dönüş yolculuğun yeniden havalanmak ve eve dönüş yolculuğu yapmak için yakıtı taşıması gerekiyorsa, dışarı doğru seyahat oldukca daha ağır olacak, daha çok yakıt gerektirecek ve bir kısır döngü yaratacaktır. Bu yüzden varış noktasında mevcut olan hammaddelerden mümkün olduğunca fazla yararlanmak oldukca daha iyi bir seçenek şeklinde görünüyor. Mars söz mevzusu olduğunda bu, Mars atmosferinin yüzde 96’sını oluşturan karbondioksit yardımıyla oldukca net bir potansiyel hedef anlamına geliyor.
Dünya üstünde ergonomik yapmanın da gezegenimizin geleceği için oldukça lüzumlu olan avantajları bulunuyor. Atmosferden uzaklaştırılan herhangi bir miktar karbondioksit geleceğimiz için bir bonus olacaktır.
Öte taraftan, SpaceX’in mevcut fırlatma takvimine güç sağlayacak kadar fazla roket yakıtını ekonomik bir halde havadan üretmesi o kadar da kolay olmayacak. Ne Musk ne de SpaceX internet sayfası, bunu nasıl başarabileceklerinin ayrıntılarını vermiş değil.
Açıklığa kavuşturmak için elimizdeki en iyi şey, Musk’ın karbondioksit ve hidrojenin birleşerek metan, potansiyel bir roket yakıtı ve su oluşturduğu Sabatier reaksiyonuna atıfta bulunan bir mühendise verdiği “Evet ” yanıtı.
Pek oldukca kişinin cevap olarak belirttiği şeklinde, karbondioksitin yakıta dönüştürülmesi, özgür bırakıldığında kullanılabilecek şekilde ortaya çıkana nazaran oldukca daha çok enerji girişini gerektirir. Ucuz elektrik, bu fikrin gerçeğe dönüşmesi için lüzumlu bir girdidir ve bu da dönüşüm verimliliğinin düşük olması durumunda önemini azaltır, sadece kendi başına kafi değildir.
Eğer Musk’ın planı Sabatier reaksiyonunu kullanmaksa, bunun dezavantajı, yanmadan kaçan herhangi bir metanın, onu yapmak için kullanılan karbondioksitten birçok kat daha büyük bir ısınma etkisine haiz olacağı gerçeği. Bu, gezegenler arasındaki seyahat esnasında büyük bir mesele olmayabilir sadece kalkış esnasında oldukca daha büyük problemler yaratabilir.
Alternatif olarak, karbondioksitin sıvı yakıta dönüştürülmesi de mümkün. Bu seçeneklerden herhangi birinin direkt hidrojen yada başka bir karbon içermeyen yakıt kullanmaktan daha iyi olup olmadığı hemen hemen net değil, sadece bunun nasıl yapılacağına dair fikirleri olanlara, katkıda bulunmaları için Musk’tan bir çağrı gelmiş durumda…
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