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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A while back I think did a tear down of body cooling solutions that are out there. There indeed seem to be hard limits.
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So active personal cooling should work pretty well also right? Not so fast, keeping the 100w of heat your body generates in and adding a few more watts in a cold environment is a lot easier than taking heat out of your body and finding a place to dump it in a hot environment.
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You can't have reverse osmosis without an enormous (by stillsuit standards) amount of waste I think?
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I have a similar idea for a helmet that does similar.
- liquid cooling
- HEPA filter
- Displays and speaker on the outside to map your facial expressions to whatever avatar you want
- Eventually, a VR headset and cameras to allow all sorts of connected mixed reality experiences
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These aren’t stillsuits but fan jackets are very common for construction workers in Japan:
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