Princeton had an "ice pond"[1][2] in the early 80's. The project was run by Dr. Ted Taylor[3] (who worked on the Manhattan project and later the Orion spacecraf

Princeton had an "ice pond"[1][2] in the early 80's. The project was run by Dr. Ted Taylor[3] (who worked on the Manhattan project and later the Orion spacecraft-- huge nuclear bomb-powered spaceships!). Snow machines made slushy ice that was stored in pond covered with insulation. Water was pumped through the pond in the summer to provide cooling. It worked well and at the end of the summer there was still ice in the pond. I read about this as a kid reading Freeman Dyson's "Imagined Worlds"[4]. Dyson's commentary is definitely worth reading. (Anything written by Freeman Dyson is worth reading.) A cheese factory used ice ponds[5] for about 10 years, eventually abandoning them because the ice didn't last through the summer and it was difficult to maintain[6]. [1]: https://en.wikipedia.org/wiki/Ice_pond https://en.wikipedia.org/wiki/Ice_pond [2]: https://www.washingtonpost.com/archive/opinions/1981/08/02/the-ice-pond-age-cometh/51396081-09a8-4afe-b69c-1217b4700408/ https://www.washingtonpost.com/archive/opinions/1981/08/02/t... [3]: https://en.wikipedia.org/wiki/Ted_Taylor_(physicist) https://en.wikipedia.org/wiki/Ted_Taylor_(physicist) [4]: https://books.google.com/books?id=MOC8UJPuvO8C&pg=PA42 https://books.google.com/books?id=MOC8UJPuvO8C&pg=PA42 [5]: http://www.nytimes.com/1984/06/03/nyregion/dairy-hoards-500-tons-of-ice-for-the-summer.html http://www.nytimes.com/1984/06/03/nyregion/dairy-hoards-500-... [6]: https://www.farmshow.com/a_article.php?aid=15129 https://www.farmshow.com/a_article.php?aid=15129