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Subways in NYC are not fun in the summer either. I always assumed it was because when they were designed they didn't consider a future state where air conditio

by kator 9y ago

Subways in NYC are not fun in the summer either. I always assumed it was because when they were designed they didn't consider a future state where air conditioners on the trains dump their heat into the tunnel. I tried searching for a similar study for NYC but all I found was old articles from years back. It doesn't look like the MTA shares any measurements of temperature in their data feeds: http://web.mta.info/developers/download.html http://web.mta.info/developers/download.html Does anyone have ideas on how we could get this sort of data for NYC subways?

ice109 9y ago
there is no way that the NYC Subway's AC's dumping heat into the tunnels contributes in any meaningful way to the temperature inside the stations - the tunnel system is enormous relative to the trains. much more it's simply NYC summers are sweltering and the stations aren't well ventilated at all.
- CydeWeys 9y ago
  Did you read the linked article? The heat of the London Underground tube tunnels is directly caused by heat released by trains (though primarily from brakes and friction, not AC), and has nothing to do with season. It's swelteringly hot down there in winter. I don't see why it'd be any different for NYC, where I live.
  - pvg 9y ago
    Many NYC subway tunnels are not 'tubes' and are shallow enough to have surface access. So part of the answer is probably that the NYC subway is a more open system.
    - CydeWeys 9y ago
      The same is true of London (also mentioned in the linked article). The linked article is explicitly only talking about the deep tunnels, which NYC also has.
      - pvg 9y ago
        The point is there are more shallow, cut-and-cover tunnels in NYC than in London. London has entire high-traffic lines that are deep tunnels.
        jrockway 9y ago
        Yeah, NYC is a very different system. The deep tunnels are very well ventilated. Go to a station at the end of a deep section, like High Street and you can feel the wind blowing out because of the forced-air ventilation system. You can also see daylight from the subway trains throughout the system, because it's that close to street level and there are ventilation grates every hundred-ish feet.
- maxerickson 9y ago
  For London the passengers contribute 2% of the heat. In a more efficient system they would contribute a larger percentage.
- silviogutierrez 9y ago
  Actually it is related to the air conditioning. Prior to AC, the subway and its platforms were cooler than the outside. Still not pleasant on a 100 degree day, but certainly not as it is today: the platform will be significantly hotter than outside. Just gotta survive long enough to board the train. https://cityroom.blogs.nytimes.com/2008/08/08/complaints-about-hot-platforms-as-old-as-the-subway/?mcubz=1 https://cityroom.blogs.nytimes.com/2008/08/08/complaints-abo...
jrcii 9y ago
https://www.dnainfo.com/new-york/20160812/midtown/we-measured-subway-temperatures-it-wasnt-pretty https://www.dnainfo.com/new-york/20160812/midtown/we-measure...

by kator 9y ago

ice109 9y ago

there is no way that the NYC Subway's AC's dumping heat into the tunnels contributes in any meaningful way to the temperature inside the stations - the tunnel system is enormous relative to the trains. much more it's simply NYC summers are sweltering and the stations aren't well ventilated at all.

CydeWeys 9y ago
Did you read the linked article? The heat of the London Underground tube tunnels is directly caused by heat released by trains (though primarily from brakes and friction, not AC), and has nothing to do with season. It's swelteringly hot down there in winter. I don't see why it'd be any different for NYC, where I live.
- pvg 9y ago
  Many NYC subway tunnels are not 'tubes' and are shallow enough to have surface access. So part of the answer is probably that the NYC subway is a more open system.
  - CydeWeys 9y ago
    The same is true of London (also mentioned in the linked article). The linked article is explicitly only talking about the deep tunnels, which NYC also has.
    - pvg 9y ago
      The point is there are more shallow, cut-and-cover tunnels in NYC than in London. London has entire high-traffic lines that are deep tunnels.
      - jrockway 9y ago
        Yeah, NYC is a very different system. The deep tunnels are very well ventilated. Go to a station at the end of a deep section, like High Street and you can feel the wind blowing out because of the forced-air ventilation system. You can also see daylight from the subway trains throughout the system, because it's that close to street level and there are ventilation grates every hundred-ish feet.
maxerickson 9y ago
For London the passengers contribute 2% of the heat. In a more efficient system they would contribute a larger percentage.
silviogutierrez 9y ago
Actually it is related to the air conditioning. Prior to AC, the subway and its platforms were cooler than the outside. Still not pleasant on a 100 degree day, but certainly not as it is today: the platform will be significantly hotter than outside. Just gotta survive long enough to board the train. https://cityroom.blogs.nytimes.com/2008/08/08/complaints-about-hot-platforms-as-old-as-the-subway/?mcubz=1 https://cityroom.blogs.nytimes.com/2008/08/08/complaints-abo...

jrcii 9y ago

https://www.dnainfo.com/new-york/20160812/midtown/we-measured-subway-temperatures-it-wasnt-pretty https://www.dnainfo.com/new-york/20160812/midtown/we-measure...