I can only say that it's from higher powers. I'm in the union, so I get to go to LMCs all the time. It's our direct managers who have told us this, and one who is directly responsible for the ESAP program.
Initially, the talk was about 100°C or 185°F, which is lower, about 90°C. They kept on singing the same tune for 10 years. Now they're singing a different tune. We always told them that it probably wouldn't work. Even at 150°C, I'm not sure. I haven't calculated the numbers, but at 150°C we're getting closer to the target numbers, so that you would be able to transfer that amount of heat over long distances to supply buildings and to keep the buildings from freezing. Unlike steam, if you have a freeze situation, water is relentless and you'll just rip the pipes.
Let's say your fresh air coils.... All buildings require a certain amount of fresh air entering the building to keep the carbon dioxide at a safe limit—ashtray standards, we'll say. In order to achieve that, you need a certain amount of fresh air coming in. At -30C°, you need so many BTUs of heat so that coil doesn't freeze. If it's water, it could freeze. If it's steam, it goes down into a trap. The steam condenses, goes down into a trap and is evacuated.
There are a lot of issues they have to look at, but I don't know....