8 ms·
as for the uk train stations, the temperatures are in part due to their age - London Underground was built in 1870s, and since that time rocks accumulated so mu
by kolinko 1y ago
as for the uk train stations, the temperatures are in part due to their age - London Underground was built in 1870s, and since that time rocks accumulated so much heat that it is extremely difficult to maintain human-friendly temperatures. Japan subway is 70 years younger, so it’s easier for them to maintain temps.
(And my hometown Warsaw subway is even younger - 50 years, and we don’t have AC whilst temperatures are at a perfect level).
What London underground might need is not AC, but a process to cool down rocks - importing coolness during winters. To maintain equilibrum you’d need to pump out around 1TWh heat every year. To bring it down to normal levels in say 20-30 years you’d need to pump out 2-5TWh a year.
- BlueTemplar 1y agoIt's still a ventilation issue rather than directly an age issue : it's the equilibrium that matters at these timescales.
- mixmastamyk 1y agoWhat does that mean, “rocks accumulate heat”? Should be an even cool temp down there, as long as tunnels aren’t too deep. A few vents to allow hot air to rise should work, no?
- isatty 1y agoMore input than output in assuming and vents were probably not built back in the day.
- walthamstow 1y agoThe ambient temperature of the clay earth around the tunnels has been rising since the tube was built https://en.wikipedia.org/wiki/London_Underground_cooling#Source_of_the_heat https://en.wikipedia.org/wiki/London_Underground_cooling#Sou...