So my Cloud-cities, were practically Rigid-Hull Airships made of titanium and graphene to withstand severe wind-speeds and turbulent weather on Saturn. The Cloud-cities in question, are floating in the altitude of Saturn's atmosphere, where the pressure is about 1-bar, temperatures are about -180$^\circ$C, and the air density is about 0.30 kg/m3, according to this wonderful answer from BMF on my previous question. The average area of one "Cloud-City" is about 100,000 km2. Electricity comes from titanium wind turbines, that harvest the intense winds of Saturn, and produce energy for generating light for Algae-O2 generators and food crops.
In my old questions, I used to feature a common feature in my cloud-city- Kronothermal Cables.
The concept was really, really simple- They were graphene cables with extremely high tensile strength, which were plunged deep into Saturn's atmosphere, attached with a bunch of copper weights to serve as ballast. The graphene cables would then absorb this heat and conduct them upwards, to the airship-hull, which contained pure hydrogen. This hydrogen envelope would get heated up and get less denser than the surrounding Saturnian atmosphere, and buoy up the balloon.
However, I am no longer optimistic about that idea, due to the following reasons:
- Since these cables are too long, they will not be able to efficiently conduct up heat to the cloud-city, and hence not work.
- These cables along with the copper blocks, won't act like a ballast for the ship to stay anchored in place.
So, I came up with a new idea.
Kronothermal Hydrogen Pumps
So this idea is very similar to the "cables" idea, but with a twist: There is no conduction of heat being used here.
The basic principle here is:
- First, a extremely long hose is lowered/dipped deep into the Saturnian Atmosphere, till it reaches the depth, where the temperature is 400$^\circ$C. The hose in question is made up of an composite titanium alloy that is flexible and strong.
- Then, a large pressure difference is created, via starting a vacuum chamber connected to the hose. This creates a pressure difference that lowers the pressure inside the hose.
- The hot Saturnian gas at the bottom of the hose is sucked up due to the low pressure inside the pipe. This gas rises up till it reaches the cloud-city, where it is made to contact the cloud-city's supporting gas-envelope, heating up the gas inside it. This heated hydrogen then buoys up the cloud-city.
What are the problems with my design? If so, what should I do to fix them?