ISS Active Thermal Control System (ATCS) Overview [pdf]

Lots of talk about sending datacenters, gpus, etc. into space...one relevant case study is understanding how the ISS sheds excessive heat.

Little snippet from the paper that states radiation is the thermal manner used for cooling..

The heated ammonia circulates through large radiators located on the exterior of the Space Station, releasing the heat by radiation to space that cools the ammonia as it flows through the radiators. .