Quote:
Originally Posted by Zeej
The Azur cars were designed to circulate the breeze of the car moving through the metro tunnels through the actual cars - passive ventilation. Actually a really nice touch. Because the entire metro system is underground, there is no relative heat gain or loss from the outdoors to deal with.
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Line 1 in Paris has had passive ventilation for a very long time (almost 20 years I would say), so I know passive ventilation quite well. It's better than nothing, but still inferior to AC. When it's more than 30 degrees outside, passive ventilation is unable to sufficiently cool passengers. Also during rush hours, passive ventilation is unable to cool passengers due to the masses of people taking line 1.
The Paris transports authority bought some new trains with a feeble AC in 2010 for line 1 (i.e. not a real AC, but still better than just passive ventilation), but their engineers did a lousy job, and within a year that feeble AC was not working anymore in all the trains (supposedly due to the system getting too clogged with dust and impossible to clean), and so they have reverted to the old passive ventilation. What's crazy is in an Anglo-Saxon country like the UK for instance, this would have been a major scandal that would have pushed the media to hound the transports authority, but here in France our journalists are totally useless, don't work much or do any investigation, so the collapse of the AC system after just one year was not even reported in the media, and in fact whenever there is a heatwave in summer the media still say line 1 has AC, when it hasn't been been true since 2012 (it was true only for one year in 2011-2012). The reason I know about it is because a- I was a regular user of line 1 back then, and b- at the SSC forum we have someone working for the Paris transports' authority who explained to us why it's not working anymore.
Same problem with RER B by the way (the RER line going from CDG airport to central Paris). Their AC (which was a real AC, not the feeble AC of the Paris métro), which is installed in half of the carriages (the newer green carriages), doesn't work in half of those new carriages due to the overhead AC system being clogged with dust which they are unable to clean. So if you ever land at CDG airport in summer, look for the newer green carriages (each train has half of its carriages (or "cars" as you call them in North America) that are the green new ones), then enter each one until you find one where AC is working. When AC works in RER B it makes a real difference. Super pleasant trip even in horribly hot heat waves. Alas that sort of full AC is a rarity on Paris lines.
As for tunnels and AC, NYC has subway trains with full AC, and it's not an issue. All of these are excuses in order not to install AC. Yes NYC subway platforms are hot in summer due to the AC of the trains, but it's far better to withstand heat on the platforms (where there is always a breeze and you can stand away from other passengers) rather than having to withstand heat in crowded trains. Besides, even on lines with no AC such as in Paris, the platforms are super hot during heatwaves anyway.