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Author Topic: Use of heat from London underground  (Read 365 times)
Nickel2
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« on: August 28, 2019, 08:29:34 AM »

Some joined-up thinking here!
A light-bulb moment in Lahndun: Heat to be recovered from the tube and used for domestic purposes.

https://www.bbc.co.uk/news/uk-england-london-49482840

Hoo - Ray! Why didn't I think of this?
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azps
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« Reply #1 on: August 28, 2019, 09:03:07 AM »

Some joined-up thinking here!
A light-bulb moment in Lahndun: Heat to be recovered from the tube and used for domestic purposes.

https://www.bbc.co.uk/news/uk-england-london-49482840

Hoo - Ray! Why didn't I think of this?

A few people thought of it. What was missing was work on studying where a readily-tapped source was within easy reach of a readily-supplied demand. Although, to be honest, when we did the study, I genuinely didn't believe that LU would ever actually accept having the kit installed into their infrastructure, given their resistance to installing mere temperature sensors on the tunnel walls!
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AndrewE
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« Reply #2 on: August 28, 2019, 06:23:30 PM »

I think they have been working on this for quite a few years now, but I haven't found a link to an article I read a while ago.  It's so obvious you can't understand why it wasn't done a decade ago, except that they are probably so busy trying to keep the basic show on the road that they can't /daren't take their eye off that ball.
In summer I suspect that they would also benefit by taking heat out of ventilating air being drawn in to the Tube, as long as condensation doesn't corrode other equipment...
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azps
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« Reply #3 on: August 28, 2019, 08:25:48 PM »

they are probably so busy trying to keep the basic show on the road that they can't /daren't take their eye off that ball.

Haha. Like I might have mentioned earlier: before I had worked at TfL, I was amazed at how badly the Tube ran. Once I'd worked there, I was amazed that it ran at all.

The engineers are working with several legacy systems, some of which are really quite ancient. They do a phenomenal job in keeping the basic show on the road as much as they do.

Yeah, that problem with pumping a load of cold air down there, knowing you're not going to find out until way too late, where all the condensation is happening ...
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stannn
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« Reply #4 on: August 28, 2019, 08:36:37 PM »

Some other waste-heat recovery schemes are mentioned in the Guardian’s item.
https://www.theguardian.com/environment/2019/aug/26/underground-line-to-heat-up-london-homes-during-winter
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Philip R
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« Reply #5 on: August 30, 2019, 02:20:35 AM »

The Munich underground provides heat to the citys district heating network.
Helsingborg in Sweden got creative and contoversial when the district heat network was connected to a waste heat exchanger fitted to the city's crematorium.
There was a gentleman speaking on BBC weatherworld this week talking about the hot London underground. Apparantly it only got hot when extended above ground when the routes were extended to the outer suburbs. He said that a major source of the heat was due to the trainsets being solar heated when above ground and carrying the heat underground. Coating the trains in solar reflective paint and more suitable window glass as used in Melbourne, Australia, would massively improve the situation.
Philip R
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