4 ms·

This[1] says it uses Peltier devices. They are not very efficient and, of course, also need to get rid of the heat somehow. I'm skeptical about the utility of

• anotheryou 7y ago
  Peltier + fan, you can see it here: https://first-flight.sony.com/images/projects/reonpocket/image03.jpg https://first-flight.sony.com/images/projects/reonpocket/ima... Looks like it blows the heat away? So it's really just a spot-cooler, which would be uncool because a cold spot will fool the body in to thinking of an inflamation I think (so you'll get a stiff neck).
  • jaclaz 7y ago
    >Looks like it blows the heat away? ... and possibly just in the face of the guy/gal behind you (I am thinking of a typically crowded Tokyo metro/station).
• londons_explore 7y ago
  Does anyone may tiny compressors? I'm thinking a micromachined scroll compressor could be far more efficient, silent, and perhaps fit in a unit the size of a matchbox and still provide a welcome 25 watts of cooling (from ~5 watts of input power, since the input/output temperature difference is small)
  • FiatLuxDave 7y ago
    If anyone has an answer to this question, I'm definitely interested in a mini compressor. As in, my credit card is ready and waiting.
    • londons_explore 7y ago
      The best I can find today is something like this: https://www.aliexpress.com/item/32911065860.html https://www.aliexpress.com/item/32911065860.html Looks like you could combine that with a butane-propane mix as a refrigerant, and make a decent little 2 watt chiller - although it really depends what the efficiency of that compressor is. I wonder if it would be more efficient than a peltier unit?
      • FiatLuxDave 7y ago
        Thank you for the response. I will check that out. It would have to be better than a peltier, since the efficiency for most peltiers is equivalent to a compressor mechanical efficiency of less than 10%. Most cheap-o compressors have a mechanical efficiency better than 50%.