You are not meant to question greenwash or eco bollox - you take at at face value :)
The 45 ton vehicle will be used in a open cast mine where it will be empty on the way down and fully loaded with another 20 tons on the way up hence it's likely to require a lot more energy to climb the hill.
I see that from the article that they are not confident that the battery will actually last in a 45 ton vehicle. It has to supply 3000 Amps for the uphill climb. Something is likely to run hot.
This is just an innefficient cable car, where cars going down offset the cars coming up.
We need a better system of electricity storage, it is quite clear. Brian
The Cruachan dam is effective. Reversible hydro electric.
Quote "Essentially, energy harvested from the truck's transition down the hill is used when it moves back up. When conditions are optimal, the truck could generate more electricity than it needs to make its ascension".
Jeeze, these people are idiots! It'll only do that if it weighs less, and probable a lot less, on the way up than on the way down. Hardly likely if they're emptying a hole!
but not a very large capacity. There's now a bigger on near Fort Augustus (Glendoe)
What follows is based on the information in JWS' link and some notes I made almost exactly a year ago on this project. I make no claims for the logic or accuracy of my maths!
Some of the most powerful tidal streams in the world are in the Pentland Firth and around Orkney. Commercial turbine arrays are now being installed there by Meygen, 85% owned by Atlantis Resources
What's being referred to here is phase 1A, consisting of 4 turbines of 1.5MW each. They claim 700MWh in August, capable of powering 2000 homes. 2000 typical UK homes would use 2000x3,300 kWh =
6,600,000 kWh in a year, or have a power requirement of 753kW. In a 31-day month such as August, this amounts to 753x24x31 = 560.5 MWh. So their claim of being able to power 2000 homes by generating 700MWh is an underestimate. They may have used a higher value for domestic electricity consumption than I've used here.The two turbines are rated at 1.5MW each, total maximum output 3MW. So in August they should have produced 3x24x31=2232MWh. Hence their capacity factor is 700/2232x100=31.4%. This is significantly higher than the figures for their Phase 1 and Phase 2 installations of around 17%, that I calculated from figures available this time last year, see below. Again, those figures depend on the value used for the annual domestic electricity consumption.
Phase 1 (now called phase 1B I think, which makes more sense) will consist of 61 turbines of 1.5MW capacity (91.5MW in total), to be completed by 2020,
The full Meygen installation is expected to consist of 269 turbines and to have a capacity of 398MW. Phase 1 is said to be capable of generating enough power for 42,000 homes, which gives a capacity factor of 17.3% **
Phase 2 (now called phase 1C) is said to be capable of generating enough power to supply, 175,000 homes, and gives an output of 65.9MW, i.e. a capacity factor of 16.6%***, close to the value for phase 1 (or 1B).
(I have no idea what the new phase 2 is going to be, or even if there is a phase 2. Somewhere else perhaps; it says they're planning a total of 600MW in Scotland, 200MW more than the total Inner Sound Stroma project) .
To match Hinkley Point C, you'd need about 11,800 turbines (2880/65.9)x269, assuming a capacity factor of 90% for Hinkley), and HPC will produce 24/7, clearly better value for money.
*the capacity factor can be calculated from the number of homes they claim to be able to supply, and OFGEM's figure of 3,300 kWh for the average household annual electricity consumption.
As I have said before Brian, you have a talent for stating the bleeding obvious. Now tell us what this better system is going to be and how we get it.
That's for the group to discuss and patent.
LOL!
It's classic cat belling isn't it?
Watching the greens and their followers reinvent the wheel, only to find out that while square ones can be made to work, really round ones is where it's at.
Or those shaped like the 50p coin.
ote:
ord-tidal-power
made almost exactly a year
nd Firth and around Orkney.
owned by Atlantis Resources
ng =A3300 per MWh. See
l a total of 398MW of turbine
island of Stroma, a couple of
he turbines are installed
C will be at that time, who
not on-off four times a day in
1.5MW each. They claim 700MWhuse 2000x3,300 kWh =3D
I guess I'm not typical, I use 10,500kWh a year.
-- =
I've taken a vow of poverty. To annoy me, send money.
the hill is used when it moves
ectricity than it needs to
and probable a lot less, on
Regenerative braking is a piece of s*it. BBC's Top Gear proved this by = showing a BMW M3 could use less petrol than a Toyota Prius doing the sam= e speed.
-- =
Never use a long word when a diminutive one will do.
Have something to add? Share your thoughts — no account required.
Ask the community — no account required