I don't entirely follow. A lot of existing nuclear plants use ambient temperature for cooling, via cooling towers, no? They use pumped coolant to get the heat out of the reactor, sure, but the cold end is just air.
Also, I guess you could have the hot end very hot too..? This improving efficiency. Especially if, by virtue of cooling being safer, you could run it at a higher temperature (less safety margin needed).
Also, I guess you could have the hot end very hot too..? This improving efficiency. Especially if, by virtue of cooling being safer, you could run it at a higher temperature (less safety margin needed).