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A heat exchanger includes a porous cylindrical sleeve with a bore into which liquid coolant is admitted. The liquid permeates the sleeve but cannot leave the outer surface. A pipe surrounds the sleeve. The pipe has a cylindrical outer surface and an inner surface defining protrusions and vapor chann

A heat exchanger includes a porous cylindrical sleeve with a bore into which liquid coolant is admitted. The liquid permeates the sleeve but cannot leave the outer surface. A pipe surrounds the sleeve. The pipe has a cylindrical outer surface and an inner surface defining protrusions and vapor channels about the protrusions. The inner ends of the protrusions bear against the outer surface of the sleeve. A plurality of helical channels are helically arranged about and in thermal contact with the outer surface of the pipe. The ends of the helical channels are coupled to plenums. Each plenum is coupled by a pipe and a fluid disconnect to one end of a thermal loop including a heat source. Heat-laden vapor passes through the helical channels and is cooled to liquid. The heat is withdrawn into the pipe and passes through the protuberances to vaporize the liquid near the surface of the porous sleeve. The resulting vapor is collected and coupled to a condenser.

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A heat exchanger for a first spacecraft module including a heat rejection arrangement, adapted for rejecting heat received from a first pipe in the form of heat-laden first vapor for condensing said vapor to a first liquid which is returned by way of a second pipe, which first spacecraft module is a

A heat exchanger for a first spacecraft module including a heat rejection arrangement, adapted for rejecting heat received from a first pipe in the form of heat-laden first vapor for condensing said vapor to a first liquid which is returned by way of a second pipe, which first spacecraft module is adapted to be mated to a second spacecraft module which includes a capillary pumped loop for absorbing heat from a source and for transferring the heat to a working liquid received over a third pipe to generate heat-laden of said working liquid vapor in a fourth pipe, said heat exchanger comprising: a porous sleeve defining a cylindrical outer surface and also defining a central bore closed at a first end and open at a second end, said second end being adapted for receiving liquid working fluid from said radiator by way of said third pipe, whereby said liquid working fluid permeates said sleeve; a thermally conductive elongated fifth pipe including a cylindrical outer surface centered on an axis and an inner surface defining protuberances projecting toward said axis and also defining vapor channels about said protuberances, said protuberances bearing against said outer surface of said sleeve, said vapor channels being closed in a region near said second end of said sleeve and open near said first end of said sleeve; and a plurality of passages helically arranged about, and in thermal contact with, said outer surface of said fifth pipe, said passages being connected to a common first junction near said first end of said sleeve, and connected to a common second junction near said second end of said sleeve, said first junction being adapted to be coupled to said first pipe for receiving said heat-laden first vapor therefrom for coupling said first vapor into said plurality of passages for condensing said first vapor into said first liquid by transferring heat to said fifth pipe, said second junction being adapted for collecting said first liquid and for coupling said first liquid to said second pipe, whereby said heat transferred to said fifth pipe causes said liquid permeating said porous sleeve to change to vapor and to flow in said vapor channels to said fourth pipe.