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#11
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"Backblaze Hard Drive Stats Q1 2019"
Rene Lamontagne wrote:
On 05/07/2019 3:34 PM, Lynn McGuire wrote: On 5/7/2019 2:51 AM, Paul wrote: Lynn McGuire wrote: Sure, we could use hydrogen for hard drive cooling. Older power plant generators use pure hydrogen gas for cooling. With a very involved purging and oil based sealing process. Of course, hydrogen filled hard drives could bring back excitement to computing when they have a containment breach. Lynn I've been burned by hydrogen. I have "experience" :-( Unfortunately, the Hydrogen reacts with some of the metals, whereas the Helium is nicely inert. Hydrogen is also exothermic upon expansion, so if a hole develops in a high pressure cylinder, the stream of gas should self ignite from the heat. Many years ago, they experimented with zeolite filled cylinders, to reduce the rate of gas escape from high pressure hydrogen cylinders. You could shoot a cylinder with a high power rifle, and the gas stream was gentle enough (because of the zeolite rate limiting) to not catch fire. Until someone smoking a cigarette sets it off, of course. Then if you're in a contained area, look out. If you order a cylinder of hydrogen from Liquid Air, of course that won't have any rate limiting. Just whatever your gas regulator might apply. The zeolite experiment was intended as a solution for carrying the gas in a moving vehicle, as a fuel store. Paul Hydrogen just wants to be free ! I used to buy 30 to 50 high pressure cylinders of hydrogen from Air Liquide a month. You've never lived until your cylinder farm rots through the piping and vents to atmosphere one day. Lynn On a small scale, back when I was an automotive mechanic in the dead of winter I had put a fast charger on a cars dead battery outside near the fence where the ac plugs where, after about an hour I went out to shut down and remove the charger in the dark, Inadvertently I must have hit the metal hold down and the plus+ terminal with the charger clip and caused a spark. Well all that freshly produced hydrogen in the empty space in the battery blew and threw parts of the battery top and a good batch of sulfuric acid in my face, I ran like hell back into the garage and grabbed the water hose and doused my face and front with plenty of cold water. For the first time ever I was lucky I wore glasses and did not get any in my Eyes. Since then I have had a great respect for hydrogen gas. Rene Why is it, we always learn how evil hydrogen is, the hard way :-/ Paul |
#12
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"Backblaze Hard Drive Stats Q1 2019"
On 05/07/2019 4:41 PM, Paul wrote:
Rene Lamontagne wrote: On 05/07/2019 3:34 PM, Lynn McGuire wrote: On 5/7/2019 2:51 AM, Paul wrote: Lynn McGuire wrote: Sure, we could use hydrogen for hard drive cooling.Â* Older power plant generators use pure hydrogen gas for cooling.Â* With a very involved purging and oil based sealing process.Â* Of course, hydrogen filled hard drives could bring back excitement to computing when they have a containment breach. Lynn I've been burned by hydrogen. I have "experience" :-( Unfortunately, the Hydrogen reacts with some of the metals, whereas the Helium is nicely inert. Hydrogen is also exothermic upon expansion, so if a hole develops in a high pressure cylinder, the stream of gas should self ignite from the heat. Many years ago, they experimented with zeolite filled cylinders, to reduce the rate of gas escape from high pressure hydrogen cylinders. You could shoot a cylinder with a high power rifle, and the gas stream was gentle enough (because of the zeolite rate limiting) to not catch fire. Until someone smoking a cigarette sets it off, of course. Then if you're in a contained area, look out. If you order a cylinder of hydrogen from Liquid Air, of course that won't have any rate limiting. Just whatever your gas regulator might apply. The zeolite experiment was intended as a solution for carrying the gas in a moving vehicle, as a fuel store. Â*Â*Â* Paul Hydrogen just wants to be free ! I used to buy 30 to 50 high pressure cylinders of hydrogen from Air Liquide a month.Â* You've never lived until your cylinder farm rots through the piping and vents to atmosphere one day. Lynn On a small scale, back when I was an automotive mechanic in the dead of winter I had put a fast charger on a cars dead battery outside near the fence where the ac plugs where, after about an hour I went out to shut down and remove the charger in the dark, Inadvertently I must have hit the metal hold down and the plus+ terminal with the charger clip and caused a spark. Well all that freshly produced hydrogen in the empty space in the battery blew and threw parts of the battery top and a good batch of sulfuric acid in my face, I ran like hell back into the garage and grabbed the water hose and doused my face and front with plenty of cold water. For the first time ever I was lucky I wore glasses and did not get any in my Eyes. Since then I have had a great respect for hydrogen gas. Rene Why is it, we always learn how evil hydrogen is, the hard way :-/ Â*Â* Paul I Dunno! lots of things in this life we seem to learn the hard way. :-( Rene |
#13
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"Backblaze Hard Drive Stats Q1 2019"
On Tuesday, May 7, 2019 at 7:16:17 PM UTC-4, Rene Lamontagne wrote:
Rene Why is it, we always learn how evil hydrogen is, the hard way :-/ Â*Â* Paul I Dunno! lots of things in this life we seem to learn the hard way. :-( Rene All the more remarkable that the Zeppelin the Hindenburg only had one accident, at the very end, and the Zeppelins themselves were very safe, except when they weren't. The Boeing 737-MAX of their day... RL |
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