Power, heat and connectivity
Error correction and redundancy help within their limits. An unrecoverable failure needs another plan; maintenance is not free.
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The ideas to retain
1. Why the cold of space does not mean free cooling
On Earth, a data center can reject heat using moving air, chilled water and cooling towers. All of that already exists around the installation and works continuously, but in space there is…
The real scale of radiators
In a 2 MW installation operating at reasonable temperatures, each square metre of radiator rejects only around 500 W. That requires deploying almost 4,000 m² of radiator surface, roughly…
Why in-orbit validation is still limited
What has been demonstrated reliably in orbit so far remains modest in scale: systems handling thousands of watts, not millions. That difference matters because moving from a powerful GPU…
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00:00 — Energy ends up in a thermal balance.
The equipment converts much of the electricity it uses into heat.
If it generates heat faster than it rejects it, energy accumulates and temperature rises.
At equilibrium, thermal inputs and outputs must balance.
Illustrative example; assumptions, not operational measurements.
00:24 — More power requires more radiating area.
Assume net heat rejection of 500 watts per square metre.
Rejecting 2 megawatts then requires 4,000 square metres under that assumption.
Real capacity depends on temperature, surface properties and absorbed heat.
Illustrative example; assumptions, not operational measurements.
00:48 — Energy is the area under the power curve.
Two panels with the same instantaneous power need not deliver the same energy.
Illumination and eclipses change how long they generate power.
The design must also cover periods without generation.
Illustrative example; assumptions, not operational measurements.
01:10 — A direct link exists only during contact.
A ground station sees only part of a low Earth orbit.
Data waits outside contact and can be downlinked during a pass.
More stations or relays change coverage but add infrastructure.
Illustrative example; assumptions, not operational measurements.
01:32 — Rate times time: the link budget.
Here, 1 Gbit/s for 300 seconds allows at most 37.5 GB.
A 60 GB dataset does not fit; a 20 GB result fits that ideal budget.
Protocols, errors and other users reduce useful capacity.
Illustrative example; assumptions, not operational measurements.
01:56 — Detecting an error does not fix everything.
Radiation can change a memory state or damage components.
Error correction and redundancy help within their limits.
An unrecoverable failure needs another plan; maintenance is not free.
Illustrative example; assumptions, not operational measurements.
