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Andy131



Member Since: 09 Dec 2009
Location: Manchester
Posts: 1267

United Kingdom 

I have been "playing" with banks of 20kW hydrogen fuel cells for a couple of years so have an insight to how they work best.

They are far more efficient hot - so short journeys are wasteful.
The gas flows are fun to increase/decrease rapidly, you need lots of damp warm air, so getting the humidity to 90% with varying air flow is fun.

This leads to an electric vehicle with a fair sized battery, and a hydrogen re-charging system that tends to run at it's optimum rather than follow the load.

Now fuel, our 20kw fuel cells use a full size BOC bottle of hydrogen every 15 minutes, granted they are "only" filled to 150bar, and you could in theory fill to 600bar, but the fuel tank is going to be heavy.

You could in theory fill with low pressure liquid hydrogen (4 bar and minus 250C), but it leaks as it warms up, so you loose it as you are parked - lets say 70% loss if parked up for 3 days.

It's a great idea for vehicles like busses, with large storage (on the roof), predictable energy use, and running for hours on end.

It feels like groundhog day, when I was newly out of my time service engineers drove 1.3 petrol vans (Viva HB) then we all got diesels, looks like petrol is back in as the flavour of the month at present. Tangiers Orange - gone, missing her
Replaced by Ewok what a mistake - now a happy Disco Sport owner

Post #359530 28th Oct 2018 10:58 am
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dorsetfreelander



Member Since: 20 Jul 2013
Location: Dorset
Posts: 3181

United Kingdom 2014 Freelander 2 SD4 XS Auto Loire Blue

Here is a handy tool that tells you the proportion of UK power from various sources.

http://www.gridwatch.templar.co.uk/ 3 x FL1 2 manual + 1 auto no real problems
FL2 S 08 reg 100k no problems
FL2 S 10 reg Gearbox, clutch, throttle body, drive shaft, steering reservoir
FL2 GS 60 reg xfer box, diff and wheel bearings
FL2 GS 11 reg gearbox ,hesitation, exhaust sensors, wiper stalk,
FL2 XS 14 reg SD4 Auto , door lock problem @ 29k

Post #359543 28th Oct 2018 2:44 pm
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Andy131



Member Since: 09 Dec 2009
Location: Manchester
Posts: 1267

United Kingdom 

Worms wrote:
Perhaps liquid batteries are the answer!


I like the idea - pump out the discharged liquid and fill with charged liquid, lots of advantages in that we can continue to run for 100s of miles without worrying about having to charge up for hours. The "Petrol station" could in theory store large amounts that could be charged overnight.

There are currently liquid flow batteries that use vanadium, I could see a way that these could use an system where discharged fluid could be swapped for charged fluid and allow you to continue your journey. Problem is they are heavy - energy density is around 20Wh/kg, compared to 40Wh/kg for lead acid and as high as 200Wh/kg for lithium.

Google vanadium redox battery Tangiers Orange - gone, missing her
Replaced by Ewok what a mistake - now a happy Disco Sport owner

Post #359549 28th Oct 2018 4:07 pm
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