zlacker

>>lawren+(OP)
Nice, should also solve global warming when the radiators they propose to dissipate a GW of waste heat blot out the sun.

>>kristj+Q2
> radiating towards deep space

Literally ctrl-f heat in the pdf.

>>Feepin+O3
Yeah another poster did the back of the napkin math to find the area these radiators would have to have: twice the size of the pentagon. Launch cost: 30 billions.

This kind of pdf is what you get when your genius startup doesn't have a single engineer with half a brain and everybody does enough coke to believe you can beat physics with sheer enthusiasm.

That, or it is calculated fraud.

>>atoav+f6
Weird to call it fraud for not having mentioned or calculated what's literally the first most visible thing you see on their front page.

https://www.lumenorbit.com/

>>Veedra+Bb
Not sure what you're on about, I have read their whitepaper in which they talk about building a large radiator assembly and mention the low temperature of space -- a fact that is absolutely irrelevant since the thermal capacity of a vacuum is nearly zero. In their table on page 1 they imply the cost of cooling is completely free in space, which I doubt, especially given the fact that the compute hardware you shoot up there is likely outdated within years and so you can hardly call a complex radiator of gigantic proportions that you had to shoot into space "free" unless you engage in very creative book keeping.

The low temperature of space is mentioned to trick non-critical people into thinking "wow smart, basically free cooling", when it is anything but. I am all for the idea of putting money into researching the topics needed to get those things going, but misleading investors like that is plainly wrong.

>>atoav+Xe
From the paper,

> As conduction and convection to the environment are not available in space, this means the data center will require radiators capable of radiatively dissipating gigawatts of thermal load. [...] This component represents the most significant technical challenge required to realize hyperscale space data centers.

and

> A 5 GW data center would require a solar array with dimensions of approximately 4 km by 4 km

> [...]

> A 1m x 1m black plate kept at 20°C can radiate about 850 watts to deep space, which is roughly three times the electricity generated per square meter by solar panels. As a result, these radiators need to be about one-third the size of the solar arrays, depending on the radiator configuration.

Seriously, what more of an acknowledgement do you want? The paper covers everything you are complaining about in pretty plain and frank language.