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    Ettin in the Playground
     
    Maquise's Avatar

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    Default High-EM Radiating Materials

    Is it at all feasible for certain materials to radiate their thermal energy as EM at a higher rate than typical blackbody radiation? Iím looking in particular for something that could be used to radiate heat waste rapidly on a spacecraft.
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    Default Re: High-EM Radiating Materials

    Quote Originally Posted by Maquise View Post
    Is it at all feasible for certain materials to radiate their thermal energy as EM at a higher rate than typical blackbody radiation? Iím looking in particular for something that could be used to radiate heat waste rapidly on a spacecraft.
    Nope, ideal black body is the best at radiating out heat. It all comes down to the balance between emission and absorption qualities of a given material. The best emitter needs to absorb every EM wave fully. Hence the name of "ideal black body".
    Last edited by Radar; 2019-07-14 at 07:36 PM.
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    Excession's Avatar

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    Default Re: High-EM Radiating Materials

    There are still a few things you can do to cool a spacecraft faster than just painting it black. Increasing the radiating area and increasing the temperature of that area are your two main closed-system options. Practically, use a heat pump to concentrate waste heat into big radiators. One idea I saw somewhere was for that radiator to be a stream or sheet of coolant fluid droplets sprayed out of one boom and collected by another. That doesn't require any pipes to contain the coolant, has less parts that can be damaged, and the coolant radiates directly into space.

    Another option is to heat something up and throw it away. Boiling off liquid helium then venting it for example. Or boiling water and venting the steam.

    Edit: found the page talking about liquid droplet radiators.
    Last edited by Excession; 2019-07-14 at 07:55 PM.

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    BlackDragon

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    Default Re: High-EM Radiating Materials

    Quote Originally Posted by Excession View Post
    Another option is to heat something up and throw it away. Boiling off liquid helium then venting it for example. Or boiling water and venting the steam.
    You could even use that as part of your thrust system. There was a short story I read once (forget the author) where all spacecraft use superheated steam rockets for thrust, and Mars have to send an expedition to Saturn's rings to find a large ice asteroid they can use for water since Earth are going to cut off their supply.

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    PaladinGuy

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    Default Re: High-EM Radiating Materials

    Quote Originally Posted by factotum View Post
    You could even use that as part of your thrust system. There was a short story I read once (forget the author) where all spacecraft use superheated steam rockets for thrust, and Mars have to send an expedition to Saturn's rings to find a large ice asteroid they can use for water since Earth are going to cut off their supply.
    "The Martian Way" by Isaac Asimov.
    They are use nuclear piles to heat the water for propulsion, so it is just forming a convenient liquid to turn into gas for a reaction engine.
    Last edited by Khedrac; 2019-07-15 at 09:20 AM.

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    BlackDragon

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    Default Re: High-EM Radiating Materials

    Quote Originally Posted by Khedrac View Post
    "The Martian Way" by Isaac Asimov.
    They are use nuclear piles to heat the water for propulsion, so it is just forming a convenient liquid to turn into gass for a reaction engine.
    Yeah, that was the one--kind of embarrassing I forgot such a famous author!

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