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Post by ianvisits on Nov 3, 2010 17:01:06 GMT
Everyone agrees that the temperatures will rise, and that the excess heat has to go somewhere! Actually the temperature is not expected to rise - but stabilise at the current levels. Although capacity on the network will rise, the new trains (etc) will use far less power than the older units, so the overall impact should be negligible. With interesting timing, I have just updated an older blog post of mine based on a lecture given by the "cooling the tube" team back in March 2008. www.ianvisits.co.uk/blog/2010/11/02/cooling-the-london-underground-2/
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Deleted
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Post by Deleted on Nov 4, 2010 5:26:29 GMT
Dude, wasn't that about station cooling? We're in the Trains section, mate. But I get your post. Excellent post.
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Phil
In memoriam
RIP 23-Oct-2018
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Post by Phil on Nov 4, 2010 7:55:53 GMT
Although capacity on the network will rise, the new trains (etc) will use far less power than the older units, so the overall impact should be negligible. Are we sure about that on LU? One of the major complaints on NR is that the new stocks draw far more current (mainly due to being heavier) and so produce more waste heat in the process. Do we know if the new trains are lighter than the ones they replace??
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Post by ianvisits on Nov 4, 2010 8:19:47 GMT
Its a combination of issues, but the general understanding is that the amount of heat produced will remain roughly stable, while the amount of rolling stock will increase.
A net reduction per unit.
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Deleted
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Post by Deleted on Nov 4, 2010 10:04:02 GMT
Although capacity on the network will rise, the new trains (etc) will use far less power than the older units, so the overall impact should be negligible. Are we sure about that on LU? One of the major complaints on NR is that the new stocks draw far more current (mainly due to being heavier) and so produce more waste heat in the process. Do we know if the new trains are lighter than the ones they replace?? My understanding is that power consumption will increase where AC is installed or trains lengthened, so on the SSL. But clearly this will have a cooling effect upon those services. Otherwise as ianvisits has suggested. Regen braking should make a big difference converting friction (heat) into electricity. One point I'm less sure about. If there is a greater frequency of trains with wider doors meaning a greater number of passengers can be transported ( more bodies generating heat) but also that the time spent on platforms waiting for a train that is not rammed will be shorter. Will the greater frequency of piston effect and shorter dwell times reduce by the same factor the additional heat generated by extra bodies? Only time will tell as I'm not sure that with the best will in the world mathematical modelling can account for this and all the other variables.
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