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morganism comments on August 2017 Media Thread - Less Wrong Discussion

2 Post author: ArisKatsaris 01 August 2017 08:16AM

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Comment author: ArisKatsaris 01 August 2017 08:17:13AM 0 points [-]

Short Online Texts Thread

Comment author: morganism 05 August 2017 08:33:11PM 0 points [-]

geo-engineering with tethers, or tall chimneys. Benefits include electric production and copious water condensate


25,000 chimneys will offset Global Warming.
Each chimney will produce electricity
Each chimney will induce rain generation in surrounding areas
Each chimney will transform desert into arable land capable of trapping . CO2
Comment author: morganism 12 August 2017 08:37:44PM *  0 points [-]



they can now make spidersilk at room temp, with cheap hydrogels. would help.

Comment author: Viliam 07 August 2017 02:57:50PM 0 points [-]
  1. I don't understand what is the difference between the air inside the chimney and the air outside the chimney. They have the same temperature so why will the air inside the chimney be rising?

At the bottom of the chimney air has the same temperature inside and outside. The inside and outside air will be rising up. However, the air outside will be cooling adiabatically, so its temperature will be dropping. The air inside will be not affected by adiabatic cooling and will maintain its energy, so it will be warmer and less dense than outside air. And the higher we go, the bigger that difference will be. That difference will be the driving force of the chimney.

I am bad at physics, so I want to ask others whether this part actually makes sense. I strongly suspect it does not.

Comment author: Lumifer 07 August 2017 03:08:02PM 0 points [-]

Without knowing much physics... "cooling adiabatically" means that both the temperature and the density decrease. If the air inside is not affected by this, it will be warmer, but will also be more dense.

Comment author: Viliam 07 August 2017 08:50:10PM 0 points [-]

I am suspicious about the part where the density decreases. That means, the air expands to a larger volume. But larger in which dimension: horizontally or vertically? I suppose it cannot be horizontally, because next to it there is air in exactly the same situation, which also tries to expand with equal pressure. But if vertically, then what is the difference between being in a (vertical) chimney or being outside of it?

Comment author: Lumifer 08 August 2017 02:44:20PM 0 points [-]

These superchimneys are pure nonsense. Don't bother.