Inductorless DC-DC converters for space application

[p1ayaone1]

I got that 12 C meant 12 deg Celcius, I meant what body has that temp? The Earth? So what you're saying is that the side of the satellite facing the Earth will have the same temperature as it?

If I've understood, then the side of the satellite facing the Sun will have the same temperature as the Sun's surface? Seems a bit hot?

I've been told that while there will be no convective heat dissipation, there will still be conductive and radiative. I.e. the aluminum chassis should sink some heat, as well as IR emitted by the hot satellite. Any need to put a CPU-style passive heatsink, or do those work purely on convective principle?

And then the side(s) of the satellite facing empty space will simply sink heat from the other sides?

Why oh why did I never take a course in thermodynamics?

 

[skeptic2]

I got that 12 C meant 12 deg Celcius, I meant what body has that temp? The Earth? So what you're saying is that the side of the satellite facing the Earth will have the same temperature as it?

Since the Earth covers nearly 180 deg of the sky, if the satellite were to get cooler than the earth, would it not receive more heat from the Earth than it is able to radiate and so warm back up. It may still conduct some of its heat to the other side of the satellite away from the earth.

If I've understood, then the side of the satellite facing the Sun will have the same temperature as the Sun's surface? Seems a bit hot?

Yes, except that instead of covering half the sky, the sun is only 0.5 degrees in diameter. In all directions other than that of the sun, the satellite would lose heat (assuming that while on the sunny side of the earth, the satellite is hotter than the earth).

I've been told that while there will be no convective heat dissipation, there will still be conductive and radiative. I.e. the aluminum chassis should sink some heat, as well as IR emitted by the hot satellite. Any need to put a CPU-style passive heatsink, or do those work purely on convective principle?

I was working at Motorola when they developed the first flip phone. Though I didn't personally work on that phone, the story I heard was that they had a serious heat dissipation problem and used a somewhat unconventional solution. Instead of a fiberglass circuit board, they used solid copper. Onto the copper they silkscreened a number of layers. The first layer was an insulating layer with holes for ground connections. The next layer was for circuit traces and wherever a ground was needed, that trace was routed over a hole in the insulating layer. That layer was covered by another insulating layer again with holes left for interlayer connections. The surface mount components were added last and soldered. The copper was able to conduct the heat away much better than fiberglass making the phone possible.

And then the side(s) of the satellite facing empty space will simply sink heat from the other sides?

...and radiate it away, but not very efficiently.