s_gamer101 Posted August 25, 2020 Share Posted August 25, 2020 I'm curious what strategy they'll use to find it. @mikegarrison said that releasing smoke or something like this won't work because it would just lead to the air cleaning system. Would it be possible to disable the air cleaning system for a while (a few hours maybe) without endangering the crew too much? Quote Link to comment Share on other sites More sharing options...
mikegarrison Posted August 25, 2020 Share Posted August 25, 2020 9 minutes ago, s_gamer101 said: I'm curious what strategy they'll use to find it. @mikegarrison said that releasing smoke or something like this won't work because it would just lead to the air cleaning system. Would it be possible to disable the air cleaning system for a while (a few hours maybe) without endangering the crew too much? I'm sure that's possible. They would likely want to do it on a module-by-module basis. I don't think they would want to just shut off the entire system unless they had to. I don't know the exact details of their system configuration, though, so I don't know which systems and modules are too integrated to isolate. Quote Link to comment Share on other sites More sharing options...
DDE Posted August 26, 2020 Share Posted August 26, 2020 They can always do an EVA inside the station while the rest of the crew is locked in the Soyuz. Quote Link to comment Share on other sites More sharing options...
kurja Posted October 16, 2020 Share Posted October 16, 2020 https://www.sciencealert.com/oxygen-supply-has-failed-in-part-of-the-international-space-station Another problem with ISS life support; nothing that would be an immediate threat to crew though. "Nothing threatens the security of the crew and the ISS," said the spokesperson, adding this repair work to fix the issue would be carried out on Thursday. The ISS is getting old I wonder if it's just a matter of time that something serious comes up. Quote Link to comment Share on other sites More sharing options...
s_gamer101 Posted October 18, 2020 Share Posted October 18, 2020 On 10/16/2020 at 10:14 PM, kurja said: The ISS is getting old I wonder if it's just a matter of time that something serious comes up. I think what might happen is that the decide to take it out of service (returning the crew to the surface and deorbiting the station) Quote Link to comment Share on other sites More sharing options...
RealKerbal3x Posted November 3, 2020 Share Posted November 3, 2020 (edited) I'm a little late but happy 20th ISS! Here's Scott Manley's video on Expedition 1 Edited November 3, 2020 by RealKerbal3x Quote Link to comment Share on other sites More sharing options...
RCgothic Posted January 11, 2021 Share Posted January 11, 2021 Wow, ok. Wonder how they're launching and getting installed. Russian self-piloting extra modules you can kind of understand. Solar panels are something else entirely! Quote Link to comment Share on other sites More sharing options...
cubinator Posted January 11, 2021 Share Posted January 11, 2021 Must be to power the expansion modules. Quote Link to comment Share on other sites More sharing options...
RCgothic Posted January 11, 2021 Share Posted January 11, 2021 (edited) Apparently they're going to overlay the existing arrays, angled out at 10 Deg. Sized to go uphill rolled up in a dragon trunk, which sounds incredible to me. This offends my sense of symmetry tbh. Edited January 11, 2021 by RCgothic Quote Link to comment Share on other sites More sharing options...
Guest Posted January 11, 2021 Share Posted January 11, 2021 Boeing must not have employees who has OCD . I cringe looking at this Quote Link to comment Share on other sites More sharing options...
YNM Posted January 11, 2021 Share Posted January 11, 2021 (edited) 2 hours ago, RCgothic said: Apparently they're going to overlay the existing arrays, angled out at 10 Deg. How does that work ? Wouldn't it mean it'd just work on one side of the wing array ? Would it be the new side of the wing array or what ? I could imagine that the idea is to increase the effectiveness of the arrays... since not all the light are absorbed you can still put a PV behind another one and it'd work albeit less efficiently compared to direct illumination, but it'd increase the efficiency of the whole system wrt. the exposed area of the array. I wonder if it's the same solar panels that'd be used for Gateway and other Artemis missions. Edited January 11, 2021 by YNM Quote Link to comment Share on other sites More sharing options...
Listy Posted January 14, 2021 Share Posted January 14, 2021 On 1/12/2021 at 10:10 AM, YNM said: How does that work ? Wouldn't it mean it'd just work on one side of the wing array ? Would it be the new side of the wing array or what ? I could imagine that the idea is to increase the effectiveness of the arrays... since not all the light are absorbed you can still put a PV behind another one and it'd work albeit less efficiently compared to direct illumination, but it'd increase the efficiency of the whole system wrt. the exposed area of the array. I wonder if it's the same solar panels that'd be used for Gateway and other Artemis missions. The panel trusses have a gimbal mechanism so one side tracks the sun, keeping that side fully illuminated. It looks like the new panels will permanently shade parts of the old panels, but they are much more efficient, so it will cancel out - the original panels could generate up to ~220kW when installed , but that has now dropped to 160kW over the last 15-20 years. The new panels generate an additional 120kW, and will bring power generation back up to 220kW, so it appears about 60kW is being shaded / lost. I suspect they probably can't increase power output much above the original 220kW as the ISS solar charge controllers (or whatever the ISS equivalent is) won't be designed for it. The difference in size between the two arrays neatly illustrates the improvements made in panel efficiency over the last 20 years or so. Quote Link to comment Share on other sites More sharing options...
Codraroll Posted January 14, 2021 Share Posted January 14, 2021 I still don't get it. Solar panels tend to react to shading the same way a water pipe network reacts to a pipe being pinched: even if it happens in just one location, it reduces the flow throughout the entire system. Also, if the old arrays have deteriorated, why not replace them entirely instead of laying new arrays on top of them? Quote Link to comment Share on other sites More sharing options...
Listy Posted January 16, 2021 Share Posted January 16, 2021 On 1/15/2021 at 1:57 AM, Codraroll said: I still don't get it. Solar panels tend to react to shading the same way a water pipe network reacts to a pipe being pinched: even if it happens in just one location, it reduces the flow throughout the entire system. Also, if the old arrays have deteriorated, why not replace them entirely instead of laying new arrays on top of them? I wondered about this as well. After I had panels put on my roof I soon noticed a dip in electricity output twice a day at roughly the same time. I realised the shadow from a small vent pipe was passing across part of one panel and then another panel a bit later, and it caused the whole string of panels to decrease their power output. I had to cut the pipe a bit to resolve that. There are options for shade as well - most modern panels have bypass diodes, and you can get optimisers or micro inverters for each panel that bypass shaded panels/cells as well, so I suppose the ISS array must be designed in a way that compensates well for the effect of shading. I'd assume the old arrays are more trouble than its worth to replace entirely, especially if they are still productive. Not sure how they'd be disposed of either. Quote Link to comment Share on other sites More sharing options...
RyanRising Posted January 16, 2021 Share Posted January 16, 2021 1 hour ago, Listy said: I wondered about this as well. After I had panels put on my roof I soon noticed a dip in electricity output twice a day at roughly the same time. I realised the shadow from a small vent pipe was passing across part of one panel and then another panel a bit later, and it caused the whole string of panels to decrease their power output. I had to cut the pipe a bit to resolve that. There are options for shade as well - most modern panels have bypass diodes, and you can get optimisers or micro inverters for each panel that bypass shaded panels/cells as well, so I suppose the ISS array must be designed in a way that compensates well for the effect of shading. I'd assume the old arrays are more trouble than its worth to replace entirely, especially if they are still productive. Not sure how they'd be disposed of either. I'm sure disposal wouldn't be much of a problem, they're light and have a large surface area. Give them a little push away from the station with whatever you're using to uninstall them and the people back on Earth will be breathing them in a few months. I imagine not having a reason to dispose of them is the main reason they're staying. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted January 16, 2021 Share Posted January 16, 2021 Maybe they are afraid of letting this thing uncontrollably floating after separation? Quote Together the arrays contain a total of 262,400 solar cells and cover an area of about 27,000 square feet (2,500 square meters) -- more than half the area of a football field. A solar array's wingspan of 240 feet (73 meters) is longer than a Boeing 777's wingspan, which is 212 feet (65 meters). Quote So is EACH IEA a cube 5 meters on a side weighing 7.7 metric tons, or are ALL FOUR of these IEAs, in total, these dimensions? The total mass of the ISS is ~390 metric tons, and the radiators are huge, so the total mass of these four IEAs COULD weigh ~30 metric tons in total. Quote Link to comment Share on other sites More sharing options...
Canopus Posted January 16, 2021 Share Posted January 16, 2021 They can't do this! My lego model wouldn't be accurate anymore! Quote Link to comment Share on other sites More sharing options...
YNM Posted January 16, 2021 Share Posted January 16, 2021 (edited) 12 hours ago, RyanRising said: I'm sure disposal wouldn't be much of a problem, they're light and have a large surface area. Give them a little push away from the station with whatever you're using to uninstall them and the people back on Earth will be breathing them in a few months. I imagine not having a reason to dispose of them is the main reason they're staying. Detaching them while being opened is an exercise in believing I suppose. Plus, there might not be an actual simple way to undo the panels off from the truss, and you'd still be left with the truss itself which I'd assume is even more difficult to undo. I'm sure they want to keep the rotating hinge itself since it's pretty difficult to send a new one then undo the old one... Then again during assembly we've moved the thing several times around the station so idk. Maybe when we have the European Robotic Arm as well, and a crew of 11 instead of 7. Edited January 16, 2021 by YNM Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted January 16, 2021 Share Posted January 16, 2021 8 hours ago, Canopus said: They can't do this! My lego model wouldn't be accurate anymore! Have you pierced it in several places to leak? 56 minutes ago, YNM said: Maybe when we have the European Robotic Arm as well The solar panels are Western, so unlikely they are equipped with grappling fixtures for Soviet/Russian "Aist", used, afaik, by the European Arm. Quote Link to comment Share on other sites More sharing options...
YNM Posted January 16, 2021 Share Posted January 16, 2021 (edited) On 1/17/2021 at 1:10 AM, kerbiloid said: The solar panels are Western, so unlikely they are equipped with grappling fixtures for Soviet/Russian "Aist", used, afaik, by the European Arm. Ah alright... I though they'd have replaceable heads or something for the ERA. Edited January 17, 2021 by YNM Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted January 20, 2021 Share Posted January 20, 2021 https://www.interfax.ru/world/745980 The SKV-2 air conditioning system in the Zvezda / Star module is suddenly off. This makes to also switch off the computer and do additional tests. Its backup system is SKV-1. The same module is leaking in more than one place still needing to be found. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted January 20, 2021 Share Posted January 20, 2021 https://www.interfax.ru/world/746073 The oxygen regeneration system Electron-VM is now out of order, too. Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted March 5, 2021 Share Posted March 5, 2021 So now we know what an astronaut’s time is worth. $130k/hr! And I thought the dealership shop rates were bad! Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted March 5, 2021 Share Posted March 5, 2021 They said, reusable rockets will make the delivery cheaper... Quote Link to comment Share on other sites More sharing options...
peridoot Posted April 17, 2021 Share Posted April 17, 2021 just watched it undock. this is cool Quote Link to comment Share on other sites More sharing options...
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