10206Re: [carfree_cities] Metro in power failure
- Apr 5, 2007quick reply to Matt:
>Thinking recently about emergency planning, it came to my mind: whatsay about 50 trains, 10 cars = 500 cars
>happens to a metro in a power failure? A few thoughts come to mind:
>- In Joel's carfree city prototype, what's the maximum number of metro
>and metro-freight trains that would be in operation at any given
>moment? What would the maximum power consumption be?
600 kW per car (max), say 150 kW average = 75,000 kW
this assumes the high rates of acceleration proposed in the book
>- In the event of a municipal utility failure, what happens with thesupercapacitors should probably be installed; these can store
>metro? Are the trains able to glide without power to the next station
>to allow a total evacuation without making passengers walk through
enough power to move trains into stations; they also help with
>- Is an emergency diesel or NG generation system out of the questionWell, only about 1000 times more ;-)
>for a metro to keep it running? My school has a roughly 80 kW propane
>generator to run the elevator, fire pump, emergency lighting, phone
>system, and intercom. I assume a metro would need _slightly_ more. *grin*
Actually, to keep the system operating in limp-along,
probably 20,000 kW would do it.
To put this in perspective, the largest diesel engines,
used to power ships, are something like 75,000 kW each.
>I'm assuming, though, that Joel's carfree city probably has all theabsolutely!
>electric lines underground, reducing storm-related failures.
>way, where would the metro's maintenance area be? In edge utility
>BTW, for a city the size of Joel's prototype, would a dedicated citycan't give a definitive answer; it depends on the power
>power plant be called for?
sources and where the energy supply is
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J.H. Crawford Carfree Cities
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