Editing Talk:2812: Solar Panel Placement
Please sign your posts with ~~~~ |
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 7: | Line 7: | ||
::...hmmm, hang on, maybe that's what the cables back to Earth are for. Spooled in/out just at the right rate (perhaps some bungee-chord included), it's how you stop ''just above'' the Sun's surface (at the limit of the conductive cable, then cut the retarding bungee just as you're stable enough at the bottom of the bounce!) and stay there. Ok, not a problem. It'll work after all{{Actual citation needed}} and I withdraw all my petty objections! [[Special:Contributions/172.71.242.82|172.71.242.82]] 10:43, 8 August 2023 (UTC) | ::...hmmm, hang on, maybe that's what the cables back to Earth are for. Spooled in/out just at the right rate (perhaps some bungee-chord included), it's how you stop ''just above'' the Sun's surface (at the limit of the conductive cable, then cut the retarding bungee just as you're stable enough at the bottom of the bounce!) and stay there. Ok, not a problem. It'll work after all{{Actual citation needed}} and I withdraw all my petty objections! [[Special:Contributions/172.71.242.82|172.71.242.82]] 10:43, 8 August 2023 (UTC) | ||
::: And then you'll have to deal with the end of the bungee cord retracting under it's own tension... and since it's no longer tethered to the craft it would probably whip back towards Earth. As an afterthought, have you ever been whipped by a released rubber band? Imagine that... but at a cosmic scale. I'd probably take my chances with the cables. [[User:Xkcdjerry|Xkcdjerry]] ([[User talk:Xkcdjerry|talk]]) 14:39, 8 August 2023 (UTC) | ::: And then you'll have to deal with the end of the bungee cord retracting under it's own tension... and since it's no longer tethered to the craft it would probably whip back towards Earth. As an afterthought, have you ever been whipped by a released rubber band? Imagine that... but at a cosmic scale. I'd probably take my chances with the cables. [[User:Xkcdjerry|Xkcdjerry]] ([[User talk:Xkcdjerry|talk]]) 14:39, 8 August 2023 (UTC) | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
Congrats, you've just made the universe's smallest Dyson sphere component! [[Special:Contributions/162.158.2.38|162.158.2.38]] 07:33, 8 August 2023 (UTC) | Congrats, you've just made the universe's smallest Dyson sphere component! [[Special:Contributions/162.158.2.38|162.158.2.38]] 07:33, 8 August 2023 (UTC) | ||
Line 19: | Line 12: | ||
I'd just like to point out an error in Randall's math: | I'd just like to point out an error in Randall's math: | ||
The light incident on the panel would only be from the portion of the surface with line-of-sight to the panel. This fraction is called the "view factor", and has its own Wikipedia page, which I'm too lazy to link since I'm editing this on my phone. Carry on! [[Special:Contributions/172.70.126.217|172.70.126.217]] 13:26, 8 August 2023 (UTC) | The light incident on the panel would only be from the portion of the surface with line-of-sight to the panel. This fraction is called the "view factor", and has its own Wikipedia page, which I'm too lazy to link since I'm editing this on my phone. Carry on! [[Special:Contributions/172.70.126.217|172.70.126.217]] 13:26, 8 August 2023 (UTC) | ||
− | :I thought Sun luminosity (total outgoing light, in all directions from all points of itsvsurface) divided by Sun area (total luminescing surface area) multiplied by the 1m² (the actual 'capturable' parts | + | :I thought Sun luminosity (total outgoing light, in all directions from all points of itsvsurface) divided by Sun area (total luminescing surface area) multiplied by the 1m² (the actual 'capturable' parts normalised to the effectively-in-contact portion of the Sun exactly in the way you're defining the view factor. |
:Further out, distance from the Sun factors in as an inverse square relationship, but it'll be negligable when you're practically at the Surface and close to the full 2pi steradian of incident light from a significantly greater area of emitting surface than the unit-area of receiving surface. Once you're at Earth-orbit distance, it's a tad below 70 nanosteradian of "panel view" and almost none of the light even from the directly facing square metre of Sun even comes close to the even smaller solid angle subtending the outwards spread of light. | :Further out, distance from the Sun factors in as an inverse square relationship, but it'll be negligable when you're practically at the Surface and close to the full 2pi steradian of incident light from a significantly greater area of emitting surface than the unit-area of receiving surface. Once you're at Earth-orbit distance, it's a tad below 70 nanosteradian of "panel view" and almost none of the light even from the directly facing square metre of Sun even comes close to the even smaller solid angle subtending the outwards spread of light. | ||
:Set your panel at the height of various solar-surface features, you might not intercept much of the light (hence division by Sun's area) yet what you'll capture will be significant. Probably well beyond any long-(/medium-, perhaps even short-)term survivability of a lump of plastic, silicon and metals normally stuck on a house roof. [[Special:Contributions/172.70.91.161|172.70.91.161]] 15:36, 8 August 2023 (UTC) | :Set your panel at the height of various solar-surface features, you might not intercept much of the light (hence division by Sun's area) yet what you'll capture will be significant. Probably well beyond any long-(/medium-, perhaps even short-)term survivability of a lump of plastic, silicon and metals normally stuck on a house roof. [[Special:Contributions/172.70.91.161|172.70.91.161]] 15:36, 8 August 2023 (UTC) | ||
− | |||
− | |||
− | |||
I was briefly confused because HVAC usually stands for heating, ventilation, and air conditioning, but is here used to mean high-voltage alternating current. [[Special:Contributions/172.69.247.50|172.69.247.50]] 13:31, 8 August 2023 (UTC) | I was briefly confused because HVAC usually stands for heating, ventilation, and air conditioning, but is here used to mean high-voltage alternating current. [[Special:Contributions/172.69.247.50|172.69.247.50]] 13:31, 8 August 2023 (UTC) | ||
:I often have the ''opposite'' confusion... ;) [[Special:Contributions/172.70.91.161|172.70.91.161]] 15:36, 8 August 2023 (UTC) | :I often have the ''opposite'' confusion... ;) [[Special:Contributions/172.70.91.161|172.70.91.161]] 15:36, 8 August 2023 (UTC) | ||
− | + | ||
I ran some calculations on using rechargeable batteries to get power from the Sun to Earth, full markdown file is [https://github.com/xkcdjerry/markdown-pages/blob/main/explainxkcd-2812-talk-calcuations.md here] is anyone to check it out. | I ran some calculations on using rechargeable batteries to get power from the Sun to Earth, full markdown file is [https://github.com/xkcdjerry/markdown-pages/blob/main/explainxkcd-2812-talk-calcuations.md here] is anyone to check it out. | ||
Line 35: | Line 25: | ||
: New idea: maybe we can make some sort of belt in which one side has fully discharged batteries and the other has fully charged ones, so that gravity balanced out and we only need to do work against friction, that should raise the efficiency greatly, with some engineering we might get it above 0.1% or even 1%, however I don't have exact data on this so this remains the work of someone with more knowledge than me XD [[User:Xkcdjerry|Xkcdjerry]] ([[User talk:Xkcdjerry|talk]]) 15:38, 8 August 2023 (UTC) | : New idea: maybe we can make some sort of belt in which one side has fully discharged batteries and the other has fully charged ones, so that gravity balanced out and we only need to do work against friction, that should raise the efficiency greatly, with some engineering we might get it above 0.1% or even 1%, however I don't have exact data on this so this remains the work of someone with more knowledge than me XD [[User:Xkcdjerry|Xkcdjerry]] ([[User talk:Xkcdjerry|talk]]) 15:38, 8 August 2023 (UTC) | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− |