David Dundas
33p40 comments posted · 6 followers · following 0
3 years ago @ http://www.conservativ... - Shapps has spotted a o... · 0 replies · +1 points
3 years ago @ http://www.conservativ... - Red Wall, go green? · 0 replies · +1 points
3 years ago @ http://www.conservativ... - Red Wall, go green? · 2 replies · +1 points
I have been following hydrogen as an energy vector for more than 10 years, and as a retired scientist and engineer with career experience in working in several sectors of the energy industries, I do know something about it. What is important to understand that all the UK's primary energy must be delivered by zero fossil fuel (green) electricity by 2050, the issue that follows that, is how to deliver it to the different consumers: either by direct connection to fixed equipment or by packaging it for moving machines, either in a battery or by hydrogen in a tank.
You can see that hydrogen is our best energy vector because it has so far been mainly carried by carbon as hydrocarbons, but these were produced by primitive plant life that used the sun's energy and photosynthesis to extract carbon dioxide from the atmosphere and water, to produce vegetation that over millions of years rotted down to form fossil fuels. The problem with fossil fuels is that when you burn them to get the sun's energy back, that releases the carbon dioxide into the atmosphere, gradually returning our atmosphere to the primeval hot state millions of years ago, of low oxygen, and high carbon dioxide, which was unfit for animal life.
Hydrogen is the best energy vector because the energy change when its outer electrons are donated to another atom such as carbon to make a compound, is very great, since they are in the innermost shell of electrons; in short it requires a great deal of energy to split hydrogen away from oxygen when you electrolyse water, but you get back the same energy when you join them together. This means that hydrogen has the greatest chemical energy potential of all the elements.
Steam reforming of methane (SMR) is the way that most hydrogen is produced worldwide; here in the UK that is around 2.5 million tons a year; the problem is that the process releases a large amount of carbon dioxide which is released into the air. Carbon capture and storage (CCS) could be a short term way of capturing the carbon dioxide, but the capture cannot be 100%, at best it is 95% efficient and the cost in the chemical plant is high, as well as the energy cost of pumping it at high pressure into deep geological formations for storage, such as old gas wells, and most importantly it has not been proven at scale. CCS is a useful stepping stone to 2050, but by then it needs to be phased out as there are alternative ways to produce hydrogen that do not release carbon dioxide.
As a final thought, one of the problems of using hydrogen as our energy carrier, is that it is a gas at room temperature which has a low energy density. This can be improved by storing it under pressure such as 700 bar (10,000 psi) for cars. It can be transported as a liquid but then it must be cooled to below -256C which requires constant energy to maintain it as a liquid. It can be stored much more easily as a liquid combined with nitrogen as ammonia, but that's an unpleasant material to handle and is likely to only be used for bulk transport such as in shipping it by sea.
The major oil producing nations such as Saudi Arabia have "seen the writing on the wall" about the demise of oil which supports most of their economies, and are starting to build facilities to produce hydrogen from the sun's rays and export it instead of oil, such as their new city NEOM.
I hope this clarifies the hydrogen saga, and thanks for reading this far.
David Dundas
3 years ago @ http://www.conservativ... - Red Wall, go green? · 3 replies · +1 points
3 years ago @ http://www.conservativ... - All of ConservativeHom... · 0 replies · +1 points
3 years ago @ http://www.conservativ... - As housing day opens a... · 3 replies · +1 points
The core reason why the UK is not building sufficient homes is because it is dominated by a few national developers who have no interest in building enough homes to see house prices fall, and no incentive to build quality homes. As the 2017 white paper said, we need to give local builders the opportunity to build a few homes on a large new estate. This has not happened for the simple reason that a small builder needs the infrastructure of roads and utilities to be able to build, which is only installed by a national developer of the whole site. The local planning authority should acquire the agricultural land, design the layout of the estate, install the infrastructure and sell the plots to any UK entity, private or public. This is a time tried and tested method that works well in many other countries.
3 years ago @ http://www.conservativ... - WATCH: Milling announc... · 1 reply · +1 points
So what did you actually do to bring the speakers into the conference website?
3 years ago @ http://www.conservativ... - WATCH: Milling announc... · 4 replies · +1 points
Is there a known problem with the conference website?
3 years ago @ http://www.conservativ... - Virginia Crosbie: Nucl... · 0 replies · +1 points
Why is climate change not a fringe meeting at conference? Is the Conservative Party asleep on the opportunities of climate change or are we fiddling while Rome burns? We have 29 years to get there and there's no Government plan to achieve it.
3 years ago @ http://www.conservativ... - A problem for Johnson.... · 5 replies · +1 points