4 ms·
They also use dynamic breaking resistors to the convert kinetic energy of the trains into heat energy. Fans then blow across the resistors to cool them. In Park
by twistedpair 13y ago
They also use dynamic breaking resistors to the convert kinetic energy of the trains into heat energy. Fans then blow across the resistors to cool them. In Park Street, this just ads to the inferno. It is at least 120F in there in the summer. I'll bring in a theromometer one of this summer afternoons.
- tanzam75 13y ago> They also use dynamic breaking resistors to the convert kinetic energy of the trains into heat energy. Fans then blow across the resistors to cool them. On subways, the electricity generated by dynamic braking is sent back into the third rail (or the overhead wiring). It does not get wasted in resistive grids. The resistive grids that you're thinking of are used by diesel locomotives, which do not have a convenient electric grid to dump the electricity into. Thus, they have to send it out into the atmosphere as heat.