https://blog.etsy.com/en/2012/the-einstein-refrigerator-built-to-last-100-years/
 
Maybe this is what cools Traveller starships so efficiently? With no moving parts and a relatively-miniscule heat source, it would seem to contribute only a minimal amount of heat itself.

--
Richard Aiken

"Never insult anyone by accident."  Robert A. Heinlein
"A word to the wise ain't necessary -- it's the stupid ones that need the advice." - Bill Cosby
"We know a little about a lot of things; just enough to make us dangerous." Dean Winchester