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The repair of a damaged giat la cooling system on the International Space Station will start the weekend giat la up until Christmas Eve, when two astronauts for six hours at a time to replace a heating valve on the outside of the station. By Henrik Nordström Mortensen 18 December 2013 kl. 11:57
On 11 December 2013 stopped one of the space station's two cooling systems, and has since NASA's people and its occupants astronauts discussed their options. But now it is clear that the two astronauts Rick Mastracchio and Mike Hopkins Saturday starts the first of three spacewalks out to the damaged cooling system.
The first spacewalk begins initiated on 21 December at 12.15 Danish time, and from time 13:15 you can here on ing.dk follow the astronauts' journey, when we stream from NASA TV channel. The damaged valve on the space station requires three spacewalks, as the two astronauts Rick Mastracchio and Mike Hopkins giat la on weekends up until Christmas Eve to perform for six hours at a time. Photo: ESA / NASA Space Station's cooling system works by tubes filled with ammonia is distributed around the space station through panels. But an error in the station pump module on the starboard side has stopped the normal flow of ammonia.
The flow of ammonia ensures an even distribution of heat and cold on the station. It makes cooling hoses so cold - currently minus 32 degrees Celsius - the station heat exchangers shut out sending waste heat from the space station into the hoses.
At the same time the heat exchanger on the space station closed by the heat, which would normally be sent around the station facility. Therefore, the two astronauts replace a valve in the cooling system on the starboard side during the 21, 23 and 25 December, according to Nasa.
The worst consequence is right now that the smoke alarms, warning systems and some modules are off. The reason is that the nominal and maximum temperature in the ammonia refrigeration system pipe may be, is 3.9 degrees Celsius.
"The greatest challenge of the spacewalk is in my opinion the major joints between tubes with fluid and pump module. But of course we have a lot of tools with if we have problems to fix them, "said Rick Mastracchio last week told Reuters.
Torben Lintrup Kirkholt two months ago, NASA has established the dangerous spacewalk
Also the purely technical content of the article is beneath contempt - what others before have pointed out as the same article was used for a week or so ago. That we now recycle the same text, it does not make it right! Here a few gems from the article:
What is a "heat valve"? Such a've never heard of physics, if I did not know better giat la I would probably conclude that it was a valve which only need to be opened so the heat can escape. What do you heat is? Phlogiston? Valve is one of many components of a pump module, and that's the whole pump module to be replaced.
So maybe cooling hoses are minus 32 degrees or 4.5 degrees? I guess 4.5 degrees when the cold hoses are unlikely to lead to the heat exchangers were close by to send heat through hoses to the station's dark side - on the contrary! giat la
It's probably dangerous because the last time NASA conducted a spacewalk astronaut was being strangled by some ice that built up in suit and that in the meantime have not found the cause. So there is a lack of confidence giat la in the U.S. suits.
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