More of an inefficient form of energy storage than anything.. any use down the road should be justified.
snnip
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Most hydrogen is currently made by processes — such as steam reformation of natural gas (methane) — that produce large amounts of CO2 as a by-product. Although ‘green’ hydrogen can be made by using electricity from renewable sources to split water molecules, this process is costly compared with more conventional production methods.
It can also be an inefficient use of renewable resources. Using green electricity to make hydrogen at times of peak demand, when that energy could be feeding the grid and displacing electricity generated from fossil fuels, could result in higher overall emissions than intended. Making hydrogen with electricity generated from unabated use of fossil fuels would be even worse.
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proper calking
Greg posted a very useful piece on calking.
snip
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Caulk seals and spans. Providing the surface is carefully cleaned1, and an appropriate chemistry identified, sealing is often trouble-free. But "spanning" is another issue entirely if the spanned gap moves with time and temperature.
How far can you stretch caulking before failing? Well, a bead of fresh silicone caulk might stretch (and recover) by 300%, and latex by nearly 100%. That's in the lab. In the real world, performance is actually closer to 50% and 20%. Why? Well, caulking ages and dries out and may shrink. It stiffens in the cold and softens in the heat. It's exposed to cleaning solutions, sunlight, water and scratches. When stretched, those scratches explode into cracks, in the same way the nick on the top of a ketchup packet concentrates forces so you can easily rip open the foil.
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05:55 in General Commentary, Technology | Permalink | Comments (0)