how come nobody has invented a practical Dune style stillsuit yet? or have they and I haven't heard?
moisture wicking fabric, reverse osmosis capture, micro solar-powered heat exchanger...
I suspect you can't shrink the heat exchanger down to body size
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The number of watts of cooling & the optionality of it (not just the maximum power, but the rate of power change, working gracefully with a human metabolism in the control loop) seems hard to miniaturize.
Space suits are mostly these functions, by mass.
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space suits keep heat in though, in a cold environment... there is radiation, but that's a different problem than convective/conductive heat regulation which is to a cold boundary...
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It’s sunny out there, sometimes. Like, sunnier than it get here.
And the sky is cold re:radiation, but the lack of convection means it isn’t quite as you might imagine. The system needs to do several kinds of heat management.
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I would think that the difference is it's relatively easy and thin to make an electric blanket heating suit, but cooling (below air temps, like, more than just a radiator and a liquid loop) needs a compressor and everything.
imagine carrying a window AC unit everywhere with you
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