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John Doe wrote:
It is interesting that they mentioned the Mir-1 O2 generator as having shown very good long term reliability. A statement, when coming from NASA, is emphatically *not* to be trusted. NASA has already been shown as being complicit in covering up Russian problems and lying outright about the safety and reliability of their craft. (Not to mention that the statement about MIR-1 generator contradicts evidence from elsewhere.) Also interesting that they mention that it is not maintainable in space. Not a good idea I warrant. If the cores of the Mir O2 generator and Elektron on ISS are roughly the same, then perhaps the problems on ISS arise from the new controls and sensors that were put in as a result of moving the unit from a manual control to a computer control with telemetry data being fed to computers etc etc. Possibly. It's also probable that they haven't fixed the problems already existing. D. -- Touch-twice life. Eat. Drink. Laugh. |
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from rusty bartons excellent thread found he
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&c2coff=1&safe=off&threadm=slrncl9824.var.andrew. gray%40compsoc.dur.ac.uk&prev=/groups%3Fnum%3D25%26hl%3Den%26lr%3D%26ie%3DUTF-8%26group%3Dsci.space.history%26c2coff%3D1%26safe% 3Doff%26start%3D25 Less detail: http://www.jamesoberg.com/elektron2_tec.html http://www.spaceref.com/iss/ops/sm.l...port.book2.pdf One question. When you do electrolysis on earth, the bubbles of oxygen and hydrogen float up. This of course wouldn't happen in zero g. So how do they get that to work? Sorry if that's in the technical docs, haven't had time to fully digest them yet. Thanks, David |
#15
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"John Doe" wrote in message ... It is interesting that they mentioned the Mir-1 O2 generator as having shown very good long term reliability. Also interesting that they mention that it is not maintainable in space. If the cores of the Mir O2 generator and Elektron on ISS are roughly the same, then perhaps the problems on ISS arise from the new controls and sensors that were put in as a result of moving the unit from a manual control to a computer control with telemetry data being fed to computers etc etc. Elektron had many problems on Mir. By the time NASA got involved, they had to use the shuttle to bring up a new Elektron because of the many problems they were having with the units on Mir. From memory, Mir had a prototype unit in Kvant-1 and had an "operational" unit in Kvant-2. The shuttle brought up a third unit. Remember the fire on Mir from the O2 candle? They were "burning" those O2 candles on Mir because of problems with Elektron. ISS is being run the same way. Jeff -- Remove icky phrase from email address to get a valid address. |
#16
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"hop" wrote in message om... It is also interesting that the original unit lasted 3 years or so, although perhaps with a reduced duty cycle (they had 2 Elektrons avialable simulataniously on MIR in its later configurations, and still got some oxygen from progress because of power restrictions). And by the time the Shuttle-Mir program got going, the US had to bring up a third Elektron because of the many problems with the second unit. Jeff -- Remove icky phrase from email address to get a valid address. |
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Jeff Findley wrote:
Remember the fire on Mir from the O2 candle? They were "burning" those O2 candles on Mir because of problems with Elektron. ISS is being run the same way. It was my understanding that they were burning candles because they had visitors in Mir and thus more people than the elektron could support. Can anyone confirm or deny this ? |
#18
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The memory of "John Doe" coincides with mine.
BTW, "John Doe", if you want to swap email directly with me at jameseoberg at houston dot rr dot com, I'd be mightly obliged.... "John Doe" wrote in message ... Jeff Findley wrote: Remember the fire on Mir from the O2 candle? They were "burning" those O2 candles on Mir because of problems with Elektron. ISS is being run the same way. It was my understanding that they were burning candles because they had visitors in Mir and thus more people than the elektron could support. Can anyone confirm or deny this ? |
#19
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In message
David Findlay wrote: One question. When you do electrolysis on earth, the bubbles of oxygen and hydrogen float up. This of course wouldn't happen in zero g. So how do they get that to work? Sorry if that's in the technical docs, haven't had time to fully digest them yet. Thanks, Looks like there's a continuous flow past the electrodes straight into the extraction tubes, so the hydrogen bubbles get washed out along one path and the oxygen through the other. The gases get extracted and the surplus electrolyte is pumped back around. I'd guess that is where most of the cross-bleed of gases happens. Anthony |
#20
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"Jim Oberg" wrote in message ... The memory of "John Doe" coincides with mine. BTW, "John Doe", if you want to swap email directly with me at jameseoberg at houston dot rr dot com, I'd be mightly obliged.... "John Doe" wrote in message ... Jeff Findley wrote: Remember the fire on Mir from the O2 candle? They were "burning" those O2 candles on Mir because of problems with Elektron. ISS is being run the same way. It was my understanding that they were burning candles because they had visitors in Mir and thus more people than the elektron could support. Can anyone confirm or deny this ? You're both right. At that specific time, they were burning O2 candles due to the six crewmembers on Mir. However, I thought this was because the Russians only had one working Elektron at that time. If both had been working, would there have been a need to burn O2 candles when there was a visiting Soyuz? Reading the history of flights like Mir NASA 3 and 4 reveals numerous references to Elektrons breaking down: http://www.astronautix.com/flights/mirnasa3.htm http://www.astronautix.com/flights/mirnasa4.htm Jeff -- Remove icky phrase from email address to get a valid address. |
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