Answers to: How have space suits dissipated the heat removed from astronauts? explain how USA suits currently use open-loop cooling and do not answer this question!

Typically, space suits must dissipate several hundred watts of heat from the body of an EVAing astronaut.

The Apollo and Shuttle/ISS EVA suits used open-loop cooling by the sublimation of water into (near) vacuum, which introduced an additional consumable and is unworkable in an atmosphere.

Have any spacesuits been designed that use radiators (and presumably heat pumps) to dissipate heat? My calculations suggest that with a radiator temperature of ~ 500 K (227 deg C) you can get around 3.5 kW per square meter, which seems manageable.

  • $\begingroup$ But how do you get the radiator up to such drastic temperatures? You need some sort of heat pump/heat exchanger. $\endgroup$ Apr 24 '20 at 11:14
  • $\begingroup$ but so maybe 600 K? $\endgroup$
    – uhoh
    Apr 24 '20 at 11:59
  • $\begingroup$ I could have sworn this was asked already. $\endgroup$ Apr 24 '20 at 13:07
  • $\begingroup$ @DrSheldon that is the question linked in the first sentence of this question, which went on to explain why this question is different even before the edit just now. I think this is a reckless close vote because this question "Have any spacesuits been designed that use radiators" is not answered there, where answers are only about suits that have been used historically. This is a forward-thinking question about suits that don't require expendable water. $\endgroup$
    – uhoh
    Apr 25 '20 at 0:40
  • $\begingroup$ @DrSheldon Answers to Will suits worn on Mars lose kilograms of “expendable water” each time they are used? do not describe any designs either, so this is not a duplicate of that either. Could you please consider removing your vote to close and allow users the ability to post new answers here? $\endgroup$
    – uhoh
    Apr 25 '20 at 0:43

During the service module spacewalk during Apollo 15-17, all three astronauts' spacesuits were connected by umbilicals to the command module. This included the closed-loop cooling water circuit, which dissipated heat using radiators on the service module.

(Technically answers the question, but perhaps not in the spirit of the question.)

  • 1
    $\begingroup$ Technically correct is the best kind of correct. $\endgroup$ Jul 22 '21 at 18:40

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