Nasa Moonbase night power quest

[DDE]

3 hours ago, coyotesfrontier said:

Batteries can't last long enough, and the "Sisyphus Option" of using lifted rocks to store energy is ridiculous.

 

On 9/28/2020 at 6:15 AM, theJesuit said:

Specifically:

https://www.google.com/amp/s/www.popularmechanics.com/technology/infrastructure/amp29463165/concrete-block-energy-storage/

Instead making the blocks using moon rocks.

What do people think of this?

Introducing the Power Accumulator from Surviving Mars:

It starts off flat with the ground and rises as it charges. It takes concrete to build.

It is far more realistic than the super-dehumidifiers (Moisture Farms) that I've nicknamed Thunderf00t's Lament.

Spoiler

 

 

Edited September 29, 2020 by DDE
Trying to fix the damned image

[kerbiloid]

Photon gas.
We should not neglect it.

Pressure = 1/3 Internal energy = 4 σ T⁴ / (3 c)

***

Say, we have a spherical mirror with photons inside.

Pressure limit ~2 GPa.

Pressure = 4 σ T⁴ / (3 c)

Tmax = (3 c * pressure / 4 σ )^1/4 ~= (3 * 3*10⁸ * 0.3 * 10¹² / (4 * 5.67*10^-8))^1/4 ~=6 MK

But 6 MK photons have too high frequency to be reflected.

Let's store the 6 000 K natural, organic, GMO-free photons.
(Then pressure is just ~2 mPa).

Required energy (see above) ~0.3 TJ.

0.3 * 10¹² / (4 * pi * radius³ / 3)= 4 * 5.67*10^-8 * 6000⁴ / (3.*10⁸).

Radius ~4.2 km

Using some usual material  and limiting the stress with 20 MPa, we need ~2*10^-3/(2*10⁷) * 4 200 ~= 0.5 * 10^-6 m thin envelope.

Taking its density ~ 3 000 kg/m3, the total mass of the sunlight balloon ~= 330 t.

***

So, if make inflatable mirror balloons (diameter = 8.5 km, thickness ~0.5 mkm, mass ~300 t) and put them on the Moon, we can just store the sunlight in bubbles.

[James Kerman]

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