No trousers day
Posted: Wed Dec 28, 2022 6:08 pm
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This is the London underground they're talking about. There's 150 years of accumulated heat there. As long as they don't go to any outdoor stations they'll be fine.moonshadow wrote: âThu Dec 29, 2022 2:32 am It seems this would be more practical in the summer time.
You mean the London underground has no ventilation !?!rode_kater wrote: âThu Dec 29, 2022 2:54 pmThis is the London underground they're talking about. There's 150 years of accumulated heat there. As long as they don't go to any outdoor stations they'll be fine.moonshadow wrote: âThu Dec 29, 2022 2:32 am It seems this would be more practical in the summer time.
Now you made me look it up. It's actually quite interesting. From wikipedia:r.m.anderson wrote: âThu Dec 29, 2022 4:31 pm"
You mean the London underground has no ventilation !?!
So it's one of those "it worked in the original design and after 150 years of changes it now doesn't work any more" things.In the original Tube design, trains passing through close fitting tunnels act as pistons to create air pressure gradients between stations. This pressure difference drives ventilation between platforms and the surface exits through the passenger foot network. This system depends on adequate cross-sectional area of the airspace above the passengersâ heads in the foot tunnels and escalators, where laminar airflow is proportional to the fourth power of the radius, the HagenâPoiseuille equation. It also depends on an absence of turbulence in the tunnel headspace. In many stations the ventilation system is now ineffective because of alterations that reduce tunnel diameters and increase turbulence. An example is Green Park tube station, where false ceiling panels attached to metal frames have been installed that reduce the above-head airspace diameter by more than half in many parts. This has the effect of reducing laminar airflow by 94%.
In London, that would never have occurred in the first place.r.m.anderson wrote: âThu Dec 29, 2022 4:31 pm What would Marilyn do not having her dress embellished by the air flow topside ?