Author Topic: General ISS Q&A thread  (Read 374498 times)

Offline Space Pete

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Re: General ISS Q&A thread
« Reply #1920 on: 05/30/2012 09:03 PM »
I believe they're getting the new intercom keysets.

Yes, I've seen posts about this on Twitter - the old DVIS keysets are being replaced with DVICE ones.
Electronic Engineer by day, NASASpaceflight's ISS Editor by night | Read my NASASpaceflight articles here

Offline Jorge

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Re: General ISS Q&A thread
« Reply #1921 on: 05/30/2012 09:20 PM »
I believe they're getting the new intercom keysets.

Yes, I've seen posts about this on Twitter - the old DVIS keysets are being replaced with DVICE ones.

Pic that a friend posted, with comparison to the Gemini/Apollo era VIS.
JRF

Offline erioladastra

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Re: General ISS Q&A thread
« Reply #1922 on: 05/31/2012 05:21 PM »
the FGB panels produce up to about 500W of power.  The Russians use this power and reduce what the pull from the USOS based on how much they are getting.

Really?

Do you have a good source for this????


Yep, i was just looking at a plot of the power output.

Offline Danderman

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Re: General ISS Q&A thread
« Reply #1923 on: 05/31/2012 05:31 PM »
the FGB panels produce up to about 500W of power.  The Russians use this power and reduce what the pull from the USOS based on how much they are getting.

Really?

Do you have a good source for this????


Yep, i was just looking at a plot of the power output.

If the aging FGB panels are still producing power in their folded state, then it is reasonable to assume that new panels in a different form factor that would allow full deployment within the available area would produce a lot more power.  We know that solar panels on earlier TKS vehicles can be moved around.

 This might be a topic for the Advanced Concepts section.

Offline Jim

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Re: General ISS Q&A thread
« Reply #1924 on: 05/31/2012 05:45 PM »

If the aging FGB panels are still producing power in their folded state, then it is reasonable to assume that new panels in a different form factor



Not really.  The same area is exposed for the same given length  and so the power output would not change

Offline Danderman

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Re: General ISS Q&A thread
« Reply #1925 on: 05/31/2012 07:11 PM »

If the aging FGB panels are still producing power in their folded state, then it is reasonable to assume that new panels in a different form factor



Not really.  The same area is exposed for the same given length  and so the power output would not change

I believe that solar energy striking a panel that is at an angle, as are the folded FGB panels, will always produce less power than a panel that is perpendicular to the incoming solar rays. Therefore, a flat panel would produce more power than a folded panel.

More to the point, a new solar panel for FGB could be made wider and shorter to provide for more area for energy production.

Lastly, new panels could use new technology for the panels to provide for greater efficiency.
« Last Edit: 06/01/2012 11:58 AM by Danderman »

Offline Nicolas PILLET

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Re: General ISS Q&A thread
« Reply #1926 on: 06/01/2012 04:49 AM »

If the aging FGB panels are still producing power in their folded state, then it is reasonable to assume that new panels in a different form factor



Not really.  The same area is exposed for the same given length  and so the power output would not change

No, because in this position, FGB's panels are unable to track the Sun.
Nicolas PILLET
kosmonavtika.com : The French site on Russian Space

Offline Jim

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Re: General ISS Q&A thread
« Reply #1927 on: 06/01/2012 12:52 PM »

I believe that solar energy striking a panel that is at an angle, as are the folded FGB panels, will always produce less power than a panel that is perpendicular to the incoming solar rays. Therefore, a flat panel would produce more power than a folded panel.


Not true, the panels at an angle still provide the same projected area as a flat panel

Online Ronsmytheiii

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Re: General ISS Q&A thread
« Reply #1928 on: 06/01/2012 04:27 PM »
Does it really matter, as the US SAW's are producing more than enough power for both the USOS and RS.....

Offline peter-b

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Re: General ISS Q&A thread
« Reply #1929 on: 06/01/2012 09:50 PM »
Sorry if this has been asked before, but could someone make a sketch or something that illustrates exactly what a "beta" angle is and how it affects the ISS? I had great difficulty visualising it from the descriptions I've read. Thanks in advance. :)
Research Scientist (Sensors), Sharp Laboratories of Europe, UK

Online AnalogMan

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Re: General ISS Q&A thread
« Reply #1930 on: 06/01/2012 10:18 PM »
Sorry if this has been asked before, but could someone make a sketch or something that illustrates exactly what a "beta" angle is and how it affects the ISS? I had great difficulty visualising it from the descriptions I've read. Thanks in advance. :)

This Flash presentation may be of help - click on the "Beta Angle" button to see an explanation and animations of ISS in high and low beta angle conditions.

http://spaceflight.nasa.gov/station/flash/start.swf

Offline peter-b

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Re: General ISS Q&A thread
« Reply #1931 on: 06/01/2012 10:26 PM »
Sorry if this has been asked before, but could someone make a sketch or something that illustrates exactly what a "beta" angle is and how it affects the ISS? I had great difficulty visualising it from the descriptions I've read. Thanks in advance. :)

This Flash presentation may be of help - click on the "Beta Angle" button to see an explanation and animations of ISS in high and low beta angle conditions.

http://spaceflight.nasa.gov/station/flash/start.swf

That was awesome, thanks!
Research Scientist (Sensors), Sharp Laboratories of Europe, UK

Offline Solon

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Re: General ISS Q&A thread
« Reply #1932 on: 06/03/2012 05:01 AM »
I was trying to find out how many portholes there are on the ISS, and where they are located, but no luck, so thought I'd try here. I found info for the Russian components, but nothing for the US. I read James Oberg saying there were quite a few, of good optical properties, but where are they? What direction do they face? Any help appreciated!

Offline Sparky

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Re: General ISS Q&A thread
« Reply #1933 on: 06/03/2012 05:12 AM »
There is a window in Destiny, facing the Earth, and two in Kibo, facing port. And of course, Cuploa. Other than that, there are CBMs with small windows in the hatches, but I'm not sure if all of them do.

Offline Space Pete

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Re: General ISS Q&A thread
« Reply #1934 on: 06/03/2012 02:42 PM »
I was trying to find out how many portholes there are on the ISS, and where they are located, but no luck, so thought I'd try here. I found info for the Russian components, but nothing for the US. I read James Oberg saying there were quite a few, of good optical properties, but where are they? What direction do they face? Any help appreciated!

On the Russian Segment, there are six nadir-facing portholes in the Service Module (SM), as well as one porthole on each of the two EVA hatches of both the Docking Compartment-1 (DC-1) and Mini Research Module-2 (MRM-2). All four of these portholes are "clocked" at plus/minus 45 degrees to the positive/negative velocity vector - so DC-1 has portholes facing port-forward and starboard-aft, while MRM-2 has portholes facing starboard-forward and port-aft.

In addition, Soyuzes offer three portholes when docked - via two side-looking portholes in the Descent Module, and one forward-looking porthole in the Orbital Module. Due to their specific clocking when docked, a Soyuz docked to MRM-2 has portholes facing port, starboard, and nadir, while a Soyuz docked to MRM-1 has portholes facing starboard-forward, port-aft, and zenith.

On the US Segment, in addition to the obvious Cupola, there is one large nadir-facing optical-quality porthole on the US lab (which is used exclusively for Earth observation payloads via the WORF rack), and two port-facing portholes on the JPM.

In addition, every USOS CBM hatch has a porthole, however the portholes on unused ports/hatches are covered with an external flap (called a CBCS flap), which can only be uncovered via EVA if the port is unused. The only portholes on unused CBM ports that are currently NOT covered with a CBCS flap are the Node 2 nadir and zenith ports - so these are the only CBM hatch portholes that the crew can "see" out of (and there isn't really much to see out of the Node 2 zenith porthole - except the blackness of space). ;)
« Last Edit: 06/03/2012 02:52 PM by Space Pete »
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