Navitron Renewable Energy and Sustainability Forum

Announcements & News => Media Watch => Topic started by: stannn on March 16, 2019, 01:49:27 PM



Title: HS2 could heat hundreds of homes.
Post by: stannn on March 16, 2019, 01:49:27 PM
https://www.gov.uk/government/news/hs2-could-provide-green-energy-to-hundreds-of-new-homes


Title: Re: HS2 could heat hundreds of homes.
Post by: noah on March 17, 2019, 11:52:35 AM
Mind you, cost of HS2 could pay for heat pumps for half the country....


Title: Re: HS2 could heat hundreds of homes.
Post by: rogeriko on March 17, 2019, 09:43:03 PM
Mind you, cost of HS2 could pay for heat pumps for half the country....

Didnt you know HS2 is just a way to transfer your tax dollars into the pockets of a few ******


Title: Re: HS2 could heat hundreds of homes.
Post by: kristen on March 27, 2019, 12:01:24 PM
I expect this is a really dumb question ...

How do HS2 trains produce so much waste heat that it is worth using heat-pump to recover it?


Title: Re: HS2 could heat hundreds of homes.
Post by: dan_b on March 27, 2019, 05:58:19 PM
Heat generation from braking a thousand tons of train from high speed whilst inside a tunnel


Title: Re: HS2 could heat hundreds of homes.
Post by: Countrypaul on March 27, 2019, 06:09:16 PM
The maximum traction expected is between 9.5 and 9.8MW with another 350KW used for ancillary services per HS2 train of 200m (though they also say 400m in places).

So if it uses 10MW when accelerating the train to 225kmh, it will take roughly the same to slow it down assuming it does not need to brake any harder. No idea how long it takes to get up to speed, but that amount of energy certainly looks significant to me. Should they be insulating the inside of the tunnelsto make the HPS more effective? :hysteria


Title: Re: HS2 could heat hundreds of homes.
Post by: kristen on March 27, 2019, 07:51:26 PM
Heat generation from braking a thousand tons of train from high speed whilst inside a tunnel

No Regen? Or does that create heat?


Title: Re: HS2 could heat hundreds of homes.
Post by: dan_b on March 27, 2019, 08:27:25 PM
I expect the trains that eventually run on HS2 will have regen braking, but typically intercity high speed trains use a mixture of braking systems in combination - mechanical friction brakes, regenerative braking, and magnetic induction braking. Friction and magnetic induction braking will all throw a lot of heat out into the system right around the train of course (the brake discs and the rail head itself) whilst regenerative braking will cause some heat output in the motors and electric power control systems as they're turned into generators and create resistance to slow the train against.

Interestingly, the new "TGV for the future" (now also known as the Alstom Horizon), which is being developed for SNCF as their new more efficient, cheaper to run, replacement/upgrade for current TGV fleet - they're claiming a 20% reduction in electricity consumption vs the current TGV fleet whilst having a higher running speed.  Most of the energy efficiency claims are coming from increased use of, and more effective and efficient regenerative braking.


Title: Re: HS2 could heat hundreds of homes.
Post by: Philip R on March 28, 2019, 12:58:19 PM
Extracting heat for centralised heating from the london underground would be a far more sensible place to start.

Philip R


Title: Re: HS2 could heat hundreds of homes.
Post by: dan_b on March 28, 2019, 07:48:02 PM
Itís being looked at

https://ktn-uk.co.uk/news/cooling-the-london-underground-to-power-islingtons-heating-network