Wow, baru lihat yang seperti ini.... sepertinya promising... Asalkan kapal nelayan tidak lewat dan nabrak/mencurinya, sepertinya sangat menjanjikan.
Untuk turbin yang dipasang dalam air, penelitian efek suara/wave yang ditimbulkan dalam air tentu sangat sulit dilakukan. Sangat sulit mengetahui efek diletakkannya turbin ini bagi habitat fauna laut. Tapi toh harus diakui banyak kapal motor yang lalu lalang di atas permukaan tidak ada orang yang komplain dengan suaranya/efeknya bagi penangkapan ikan/habitat laut. Dari segi teknis, saya tidak bisa membayangkan bagaimana caranya menjaga karet sepanjang 200 meter agar tidak sobek saat digoyang oleh ombak, namun cukup tipis/fleksibel untuk dapat menerima tepukan ombak dan menekan air yang ada di dalam tabung karet tersebut. Tapi tentu saja saya bukan engineer ahli. Saya tidak tahu bagaimana teknisi pembangkit listrik dari generator bisa menjaga suhu tungku pembakarannya tanpa merusak pabrik, atau bagimana pabrik baja bisa meleburkan besi tanpa membuat kehancuran alat-alat pembuatnya. Saya yakin teknisi-teknisi Indonesia tentu bisa mencari pemecahan atas masalah-masalah yang ada berkaitan dengan operasional sistem ini sehingga biaya pemeliharaannya bisa semurah mungkin. Info yang sangat menarik pak... terima kasih. --- On Sat, 28/11/09, Hok An <ho...@t-online.de> wrote: From: Hok An <ho...@t-online.de> Subject: Re: [Keuangan] Energi Arus Laut To: "Bali da Dave" <dfa...@yahoo.com> Received: Saturday, 28 November, 2009, 1:28 AM Yang cantumkan dua isi saja: proyek seagen/seaflow untuk arus laut dan proyek anaconda untuk ombak. Kedua proyek ini dimensi dana masih belum besar, jadi Indonesia kalau mau masih bisa ikut (maksudnya beli atau lebih murah lagi tiru perusahaan yang terlibat dalam proyek2 ini). Anaconda sangat menarik, sebab bahan baku utama adalah karet, jadi yang masalah adalah komponen2 lain yang juga harus tahan air laut. Jadi yang punya semangat silahkan investasi. Salam Hok An Seagen: http://en.wikipedia.org/wiki/SeaGen http://www.marineturbines.com/3/news/article/26/marine_current_turbines_reveals_details_of_seagen_s_operating_performance/ Anaconda: http://www.newscientist.com/article/dn14258 Giant rubber snake could be the future of wave power * 14:09 04 July 2008 by *Tom Simonite* <http://www.newscientist.com/search?rbauthors=Tom+Simonite> * Video: Giant rubber snake could be the future of wave power <http://www.youtube.com/watch?v=VamSAbwgJKk> A giant rubber snake could be the future of renewable energy. The rippling "Anaconda" produces electricity as it is squeezed by passing waves. Its developers say it would produce more energy than existing wave-energy devices and be cheaper to maintain. Retired physicist Francis Farley and Rod Rainey of Atkins Global <http://www.atkinsglobal.com/> dreamed up a flexible tube filled with seawater and sealed at both ends like a giant sausage. The structure streams out in the waves like a windsock pushed by the wind. The passage of each wave squeezes the rubber and produces a bulging pressure wave that travels down its length. When the bulge reaches the end it sets turbines spinning to generate electricity. Slippery customer Eventually, full-scale versions should be 7 metres across, 200 m long and be anchored at one end in water between 40 m and 100 m deep. For now, however, engineers John Chaplin <http://www.soton.ac.uk/mediacentre/guidetoexpertise/john_chaplin.html> and Grant Hearn at the University of Southampton are testing mini Anacondas, a few metres long, in a wave tank. "The top barely breaks the surface, and you can see the bulges moving down the tube," says Chaplin. "In engineering terms, it is unlike any other offshore structure," he told *New Scientist*. "It's not a solid structure like an oil platform and it doesn't behave like a boat either." Preliminary results are promising, says Chaplin. By tuning the diameter, flexibility and thickness of the rubber tube it is possible to make the Anaconda's pressure bulges travel at roughly the same speed as the waves outside. As a result they gradually gather more energy from the waves as they travel down the tube. Snake scales A full-scale device should produce 1 megawatt - enough to power around 2000 houses. By comparison, each jointed steel cylinder of the Pelamis wave power system <http://www.newscientist.com/article/mg19425996.400-eel-feel-helps-wave-power-go-with-the-flow.html>Movie Camera which is being trialled in Portugal generates just 0.75 MW. Anaconda's unique design should also handle the greatest challenge of wave energy better. "The ocean is a very hostile environment," says Chaplin. "The structure has got to be there and still working after the largest storms." What's more, saltwater corrodes metal structures, making maintenance costs high, he says. A rubber structure with few mechanical parts exposed to the sea should be more resilient. Chaplin hopes to have a one-third scale model for testing in the sea next year and says full-scale Anacondas could be commercially available in five years. __________________________________________________________________________________ Last chance to win a Sony entertainment pack thanks to Yahoo!7. Hurry, ends Nov 30. Enter now: http://au.docs.yahoo.com/homepageset/ [Non-text portions of this message have been removed]
