Life after cheap oil: April 2009 Archives

Dirty

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Mobility has brought us global sourcing of goods: China as the proverbial factory churning out cheap goods that are brought to us by giant container ships. But a recent article in the Guardian reports that the hidden price of this mode of transportation is quite high. 

Confidential data from maritime industry insiders based on engine size and the quality of fuel typically used by ships and cars shows that just 15 of the world's biggest ships may now emit as much pollution as all the world's 760m cars. Low-grade ship bunker fuel (or fuel oil) has up to 2,000 times the sulphur content of diesel fuel used in US and European automobiles.
Cars driving 15,000km a year emit approximately 101 grammes of sulphur oxide gases (or SOx) in that time. The world's largest ships' diesel engines which typically operate for about 280 days a year generate roughly 5,200 tonnes of SOx.

The numbers....

The world's biggest container ships have 109,000 horsepower engines which weigh 2,300 tons.
Each ship expects to operate 24hrs a day for about 280 days a year
There are 90,000 ocean-going cargo ships
Shipping is responsible for 18-30% of all the world's nitrogen oxide (NOx) pollution and 9% of the global sulphur oxide (SOx) pollution.
One large ship can generate about 5,000 tonnes of sulphur oxide (SOx) pollution in a year
70% of all ship emissions are within 400km of land.
85% of all ship pollution is in the northern hemisphere.
Shipping is responsible for 3.5% to 4% of all climate change emissions

Small is not beautiful

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At least when you are considering windturbines or windmills. Lowtech Magazine reports about a real life test conducted in the Southwest of the Netherlands (Zeeland), a relatively windy and open area near the sea. If small windmills can perform, they must be able to do it over there. As earlier predicted the test proved that the concept of a small windmill is fundamentally flawed. Size of the rotor matters.

Close to the test site stands a (relatively) large windmill with a rotor diameter of 18 meters. It delivers 143,000 kWh per year, or an average power output of 16,324 watts. It can power 42 Dutch households. This large windmill costs only slightly more than all small windmills combined (17 percent more, to be exact, or 190,000 euro), but it delivers almost 20 times more energy. This comes down to 4,523 euro per household.
Wind power rules, but small windmills are a swindle. Bigger is, in this case, better.



Unexpected benefits

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There are a lot of windmills generating electricity in Denmark. 

Two Danish researchers have conducted a fascinating study on the effect of these windmills on the prices of electricity on the spot market (day trading between big producers/users of capacity). Spot market prices have a real economic effect which businesses (large consumers) do see but end-users who buy electricity at fixed prices usually do not see. The spotmarket prices indicate the real-time mismatch between demand and supply. If demand starts to exceed the base load the producers have to start up (expensive) gas-fired plants.

Their conclusion is that windmills do reduce spot market prices with a sizable amount, generating real benefits for consumers.
One should add this effect to the economic benefit of windmills. According to the researchers this effect compensates the subsidies granted to windmills if you consider it at the level of society (taxpayers/consumers).
An unexpected benefit.....

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Hot air

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David J Mackay is a professor of physics at Cambridge University (UK). Frustrated by the abundance of biased and misleading statements about sustainable energy he has put himself to the task of getting the facts and the numbers right. Debunking myths and doing the hard work of getting the numbers right. Something that fits with our philosophy....

It has led to 500 pages of facts and figures, written in an easy style. You can buy the book or download the pdf for free. Mackay has even published (most of) the book under a Creative Commons License, allowing you to re-use most of his graphs and texts.

A Herculean job, a must read for anybody who is interested in facts and figures, even when you do not agree with all his examples and conclusions. Some of them are a bit simple and do not dig deep enough, some methods of comparing energy-efficiency may lead you easily to the wrong conclusions. (Just nit-picking...).

Anyway, a major and important effort to make the facts and figures accessible for everybody.

The sound of fusion

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Nuclear fusion reactors are the holy grail of energy production. A promise of virtually waste-free, CO2-free production using relatively abundant sources. But fusing deuterium and tritium into helium requires enormous pressures and temperatures to start with. The mainstream approach is to use lasers to create the pressures and contain the superhot plasma  with strong magnetic fields. A seven-country consortium behind the International Thermonuclear Experimental Reactor, or ITER, is planning to spend $17 billion over 30 years to prove fusion power plants are commercially viable. Construction on the massive project is expected to begin this year in France.

Fortunately there are underdogs that take a different approach. The Canadian newspaper the Star reports on a few mavericks who have revived an old idea: use sound waves to create the pressure. They believe that with modern day digital controls you can manage the speed and precision required to create a spherical pressure wave with over 180 actuators.

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General Fusion's approach can be found here
At least it does not violate laws of physics as we know them.

Anyway, my sympathy is for the guys who have the audacity to leave the beaten track and think of something new. Todays crackpot may become tomorrows genius....



Improved mistake

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As long as we keep our eyes open for the unexpected we tend to learn more from "failed" experiments than expected. Take penicilline for example.


"We were studying making hydrogen in microbial electrolysis cells and we kept getting all this methane," said Bruce E. Logan, Kappe Professor of Environmental Engineering, Penn State. "We may now understand why."
Methanogenic microorganisms do produce methane in marshes and dumps, but scientists thought that the organisms turned hydrogen or organic materials, such as acetate, into methane. However, the researchers found, while trying to produce hydrogen in microbial electrolysis cells, that their cells produced much more methane than expected.
"All the methane generation going on in nature that we have assumed is going through hydrogen may not be," said Logan. "We actually find very little hydrogen in the gas phase in nature. Perhaps where we assumed hydrogen is being made, it is not."  

The cells are about 80 percent efficient in converting electricity to methane and because they use carbon dioxide as feed stock, would be carbon neutral if the electricity comes from a non-carbon source such as solar or wind power.

Great. 
Microbes generating methane from carbondioxied when stimulated by electricity.



World Car of the Year has announced that te winner of the 2009 World Green Car Award is the Honda FCX Clarity. Jurors felt that "The FCX clarity is an utterly real, hydrogen-fuelled luxury sedan that provides the amenities people expect in a premium car with 430 km range, fuel consumption of about 3.3 litres/100 km (72 mpg US) equivalent and zero tailpipe emissions. While there is only so much the automotive industry can do when it comes to this technology - governments need to come onboard to help create a true refuelling infrastructure - Honda must be credited for taking a bold step in leasing FCX Clarity to customers in California for US$600 per month. There's still a long way to go before fuel-cell cars will become a commercial success, but hats off to Honda for continuing to advance this expensive technology during a time when every cent counts.." 

Now we know that this is just marketing speak, but I do like the $600 lease. As a customer who is in to some adventure, you can get it without too big of a financial risk. Shouldn't governments facilitate this? Thedailygreen also drove the car and is quite positive. However, they conclude with the so true statement: "If the car itself were the only factor, the FCX Clarity would be in showrooms now. But hydrogen costs approximately $10 a gallon equivalent to make, and we're nowhere near having an affordable production plan for these vehicles." Nevertheless, I think we should definitely start using them. Now.

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Import wood or electricity?

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Biomass has a large potential as a renewable source of energy. A lot of research is done on the gasification of wood, such as the biomass-to-Synthetic Natural Gas (SNG) reactor of ECN in the Netherlands. 
Gasification of wood is an old process, used for instance in the second world war to fuel cars. The research is focused on large scale (up to 1000 MW) continous gasifications plants that convert the gas to methane with the same high specifications as natural gas. Compared with the existing simple (small) gasifications reactors this is a highly sophisticated chemical processing plant.

You have to aim at these sizes if you want to replace a sizable amount of our natural gas consumption with SNG . The amount of wood needed to feed these plants is massive, millions of tons of wood per year, chopped to small chips. You have to import this wood by ship, you cannot  harvest these quantities in the Netherlands.

That raises two questions. One: transportation and chopping of wood requires energy and creates CO2 emissions (assuming diesel is burned), how is the balance? Two: why transport wood to the Netherlands, is it not cheaper/easier to generate the gas or the electricity in Finland, in the middle of the forest, and transport the endproduct to the Netherlands?

The answers are surprising.  

You can generate approx. 275 cubic meters of SNG out of  1000 kg of chopped wood. Burning this amount of natural gas equals approx. 530 kg of CO2 emissions. Using wood as a source for SNG means you do not add to the amount in the atmosphere, provided you renew the forestation. Suppose you have to use 2 liters of diesel to chop up and transport the 1000 kg. Burning these 2 litres generates 5,3 kg CO2, a ratio of 1 %. Surprisingly low.

What if you transport the gas or the electricity? Well the losses (powering compressors for gas, transmission losses for electricity) during the transportation are higher than incurred by transporting the wood. For instance, you lose several % in long high voltage transmission lines. Over there you probably cannot reuse the waste heat, which you can do when generating gas/electricity in the Netherlands close to urban areas.

So yes, it does make sense, both economically and in terms of GHG emissions to import wood from far away to the Netherlands and create gas, heat and electricity over here.

 

Puma

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BoingBoing Gadgets points us to this Segway/GM collaboration prototype. Apparently it is not an Aprils fool joke....


Recycle

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Great handicraft.

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