Showing posts with label wind turbines. Show all posts
Showing posts with label wind turbines. Show all posts

Saturday, October 25, 2014

Wake up call for Canada


Dear Gerald,

I read with interest your article in the SPIN. May I offer my two cents of opinion on the subject?   
First I must admit I agree with many points you made. For example, there is no need in 21st century to fly over the world to demonstrate support for climate change action. I totally agree that televised video-conference would be not only more efficient but also more effective. A great example of this approach I witnessed at the Green Buildings Council Conference in Vancouver last year where Cisco technology (which was one of the sponsors of the Conference) allowed to connect live audiences from Portland Oregon, Germany (forgot the city) and Shanghai China with Vancouver over the gigantic wall screens. 
  
I would leave the discussion of the level of urgency on the climate change aside for time being – but I hope we agree that both so called “green” side and its opponents (should we call it “black” for oil?) have their agenda and political lobbies. Either side is supported and promoted by various sectors of industry and because of that they have more in common than different. They all want to build mega-gigantic projects – economy of scale of course – be it a wind farm, a solar power plant the kind you mention in your article, a hydroelectric dam nuclear power plant or any other. 
   
Any technology has its hurdles. And any large-scale projects create large-scale problems. Wind turbines kill birds and bats (by the way, encasing them in the “housing” will significantly reduce turbine's efficiency so this is not a good option). Solar plants expropriate large areas of land and contribute to the grid instability. Hydro dams flood huge areas and disturb regional ecosystems (Site C comes to mind). Fukushima disaster reminded again of potential dangers of nuclear meltdown. 
   
But keep being reliant on fossil fuels – be it oil or natural gas - is not an alternative. “Business as usual” is an equivalent of stagnation at best, and in a world moving forward with a fast pace it is a guarantee to be left behind. The statement that fossil fuels are “wonderfully efficient, abundant throughout the world’s crust and will not go away” is extremely misleading. If a definition of efficiency is simply "being cheap” in a short run, then I want to know a long-term cost. "Abundance" is a very relative notion. Distribution of fossil fuels around the planet is very uneven – this is why some parts of it have to bring them from the other side of the globe spending lots of the same fossil fuel on the way. “Will not go away” doesn’t even fit common sense. All natural resources are finite, and in the case of fossil fuels the rate of their extraction exceeds the rate of their natural generation by thousands times - this is the fact which will not go away. Don’t forget oil is used not only for fuel – all plastics, paints, a lot of cosmetics and number of other products are derived from oil. While we may change our estimates of when the so called “oil peak” occurs, new methods of the natural resources extraction can only accelerate the rate of their depletion. They are also becoming more costly, which eats into the so called “efficiency” of fossil fuels. Alternative technologies, particularly solar PV and solar thermal, at the same time are becoming less expensive and more efficient in terms of their performance. 
  
Cost of one alternative versus another deserves more discussion. Even if one would wave away an indirect cost of a long-term consequences of a greenhouse effect and global warming - which although would be not wise but it is in the human nature to think what would happen later - he or she can hardly do the same about the health affecting air, ground and water pollution. And what about after-cost of unavoidable equipment failures and human errors? Shall we recount events like oil spill in the Gulf of Mexico, derailment in Lac-Megantic, an explosion at pump station in Saskatchewan and barely avoided another disaster with the Russian cargo ship which lost power near the British Columbia coast? 
Risking of falling victim of the overused (and may be over-politicized) term “sustainability” I need to say few words about it. Any system – technical, economical, biological or social – consists of a number of components. In very general terms, sustainability is a system’s ability to remain in balance over extended period of time without need for external resources or energy. In other word’s it is a measure of a system’s stability. It is a lesson of generations of engineers that the more complex system is – i.e. consisting of a larger number of components – the less stable it is.
One of the most familiar and relevant examples of a complex system is a power grid, consisting of a large number of energy producers (typically power plants), even a bigger number of all sorts and sizes energy consumers (from residential homes to institutions and industry) and an extremely tight and interconnected energy transmission and distribution network including under and above ground power lines, substations and many other. In a centralized grid all components are highly inter-dependent, which on numerous occasions was demonstrated by big blackouts, recently in Calgary. Residents of Sun Peaks are very well familiar with the consequences of a drunk driver hitting a power pole. Several hours in darkness, and often in cold during the winter is not fun to say the least!
Take another example, from a subject which became touchy recently – distribution of oil and natural gas over pipelines. Complex, expensive, subject of environmental concerns and political disagreements, their short-term benefits are unstable. As with any resources, demand for Canadian oil is highly dependent on an unpredictable international business and political environment. Pipeline like the Northern Gateway is an easy target for terrorists’ attacks and political manipulation. Take example of Russia using its natural gas supply as a tool for political pressure on Ukraine and not too subtly - on Western Europe. Bet on China is a very risky gamble. For one, Russia will easily and happily overflow it with much cheaper oil and gas than Canada can ever afford to offer. US is already resisting Canadian oil – not only they have enough of its own but they are steadily moving away from oil dependency. 
     
I hear you asking - what is the alternative? Glad to oblige. I am not a supporter of government mandated or subsidized technologies, but I strongly think we need a long-term sustainable national energy strategy based on the System Approach and Real Options methodology.
Decentralized energy system should be very seriously considered. Continuous progress in solar, particularly solar thermal technologies in combination with air and ground source active heat exchange, as well as in in energy storage technologies including fuel cells and phase-change thermal accumulators, makes a self-sufficient house or a building a real possibility. We are talking about more than “net-zero” building where more energy produced than consumed at some periods of time but it needs to draw energy from the grid at other times averaging to about zero over the year. We are talking about a building as a self-sufficient system. Passive design, energy conservation measures and new highly thermoresistant materials in combination with ultra-efficient lights, appliances and electronic equipment significantly lower energy demand. Equipped with on-site renewable energy generation, heat recovery, water recycling. No more blackouts or freezing while waiting for a power to be restored. Individual houses are connected in an “intelligent network”. A further evolution of a “smart grid”, it is a sort of an “energy cloud” in which all nodes are independent from each other but can combine the power when needed.  
     
The projects like Northern Gateway and alike take an enormous amount of financial and intellectual resources which could not be used elsewhere. The more we invested in these the more difficult it will be to change the course later. It is more than likely that much higher return on investment in 30 to 50 years of projected lifetime would be achieved if invested in the research of new technologies. This would have more than economical and environmental benefits but also decide on which way Canada would be moving in the future – slide to a backward resource dependent state or move toward the advanced technological society. And if the government still wants to build something large across the country I have a proposal - high-speed train connecting Canadian West and East Coast. It works for Japan, Taiwan and Korea - why it shouldn't in Canada? 
  

Friday, October 10, 2014

Sunday, September 14, 2014

Underwater Energy Storage

Browsing recently through the latest issue of IEEE Spectrum - my favorite nighttime reading  - I came across of one interesting idea - underwater energy storage, developed and currently being deployed in a pilot project by a Canadian company Hydrostor. Having recently considered a pump back hydro storage for one of our clients, we came to a conclusion that the potential and difficult to accurately estimate  environmental impact of a large scale project (it would not be economically viable on a small scale), its high cost and other limitations make such a project hard to justify.
An underwater energy storage on another hand largely mitigates these problems. One version is a flexible underwater balloon, looking not unlike high-flying air balloon, is convenient for small-to-medium size applications, can be deployed temporary and re-deployed with little disturbance to the fauna and environment at large.


An underwater energy storage implemented as permanent installation is more suited for medium-to-large size applications and can actually benefit underwater fauna by providing with the structure to build an ecosystem not unlike the coral reefs.          
 

Sunday, April 6, 2014

Energy: Choices we make

“All serious mistakes are made on the day One. Worse yet, you may have to live with them for decades”. This was said about project development, but can also be applied to political decisions and national strategy.

The case in point: Australian National Broadband Network.

Canada (as the rest of the world) is currently at a crossroad in respect to its long-term national energy strategy. What choice will we make? Here are some of the possible options:

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Coal

Coal is one of the traditional and still the "cheapest" sources of energy. It is however recognized even by its proponents that its impact on the environment, mostly  CO2 emissions, is not something which can be ignored. The so called "clean coal" is only a temporary solution - as its business case based on the purchasing of the recycled CO2 by the oil industry (see Clean Coal - Is It for Real?)  - until other alternatives will make it unnecessary and obsolete.   

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Gas

It seems the world turned 180 degrees since just few years ago since the new reserves and new technologies of extracting oil and natural gas came to light. We seem to forget the concept of the "oil peak" popular a decade ago and tend to ignore now that even with comparatively lower direct CO2 emissions from natural gas there are many other negative factors associated with the oil and natural gas, particularly methane (which has 23 times more greenhouse potential than natural gas itself) and other harmful bi-products. What especially bothers me is that choosing this way will only prolong our addiction to fossil fuels and divert resources and capital from developing real clean alternatives - thus making inevitable migration away from fossil fuels in the future more painful      
Safety is an additional - and ever increasing concern. The oil and gas extracted from Northern Alberta or other places has to be delivered to the processing plants and eventually to their end-users. Pipelines are susceptible to leaks and to terrorism. Delivery by train carries an inherent danger which was tragically demonstrated by the derailment and explosion in Lac-Megantic. Also, the risk of spill from tankers, however small it can be, may as it already had in the recent past, have very serious consequences.      

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Hydro


Electricity produced by hydro plants is generally considered "clean". One of the best examples of it is British Columbia where 90% of electricity is produced by hydro plants. At the same time construction of new large hydroelectric dams, like the one is planned in the Peace River region of British Columbia (Site C dam C dam), is met with increasing and well justified resistance due to the large areas of agricultural and lands with valuable habitat would be lost.  An ambitious plan to build a large number of hydro dams in China which is in desperate need of energy while reducing air pollution causes the same concern.   

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Nuclear


It is impossible to discuss nuclear energy within few paragraphs without addressing both its high output, nuclear industry reliability track record, but also potential dangers of catastrophic failure and enormous complications related to storing of nuclear waste. I will limit the discussion by one comment only - assuming all hurdles of such endeavor as new nuclear project are overcome, it will take many years and billions of dollars of capital investment  to implement such a project.


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Wind 


Wind turbines are a source of clean energy and become increasingly popular and wide-spread, especially in Europe. The capacity factors and useful service life of industrial wind turbines (IWT) are important determinants of levelized wind energy costs. However, some recent studies have brought to light the capacity factors are less and useful service life is shorter than typically assumed. Based on analyses of actual production results, it appears the capacity factors of wind energy projects in many areas of the world are much less than previously estimated. As a result, the capital costs and environmental impacts of implementation would be much greater. It is typically assumed that the life span of the wind turbine is 25 years. But even 20 years may be too optimistic.

The analysis of almost 3000 onshore wind turbines in the UK - the biggest study of its kind - warns that they will continue to generate electricity effectively for just 12 to 15 years.
The “load factor” - the efficiency rating of a turbine based on the percentage of electricity it actually produces compared with its theoretical maximum - is reduced from 24 per cent in the first 12 months of operation to just 11 per cent after 15 years.
Icing in the Northern and mountainous regions is a factor significantly affecting the turbine's efficiency and is often underestimated. 
Because of the moving parts and exposure to the external environment, wearing of equipment require regular maintenance, and more so the longer it is in operation.

Transmitting energy from the wind turbines incurs energy losses, which is a serious addition to other losses when located in remote areas which typically is the case.
Finally, the impact on habitat. In the US alone wind turbines kill more than 14 million birds and 42 million bats a year!   
  
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Geothermal


Geothermal electrical plants is another source of clean energy because it does not require fossil fuels to be burned . A big advantage of the geothermal energy is its reliability and consistency comparing to wind or solar. It has its challenges however.
Open geothermal systems emit air pollutants. This include hydrogen sulfide, arsenic, and some toxic minerals. Mineral build-ups are frequently deposited in landfills. Closed loops avoid this problem.
The equipment and installation are both very expensive. Despite their long-term cost savings, geothermal plants have very high up-front costs. Installation can also be very destructive. It requires significant amount of drilling and digging around. Also, the under surface footprint of a geothermal plant is much larger than its above surface footprint.

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Solar

Sun gives energy for life on Earth and is one of the best sources of energy we could think of. It is clean, safe and because we know pattern of its movement across the sky, is also predictable. There are several ways of utilizing solar energy.

    Solar Photovoltaic


More familiar for most people than other solar technologies, photovoltaic (PV) technology originated first in space applications, found ts place in commercial and residential market and are even entering transport - from airplanes to ships (e.g. see Electric Aircraft  and  Solar Ship).
While their efficiency is still low to compete with any conventional or other alternative sources on a cost basis, solar PV modules have one extremely important advantage - they involve no moving parts, meaning practically no maintenance, and also zero noise.  
Despite recent dramatic improvements in efficiency and reduction in costs, solar PV systems  have a very long payback period, which holds their large scale implementation.

   Solar Concentrated Plant
 
These exotic looking installations with thousands of mirrors are popular in Europe, particularly in Spain, and are most efficient in regions with high solar irradiation like in in Africa, or California deserts. They require large secured unpopulated areas which limits where they can be deployed. Their efficiency can also be seriously reduced when the reflecting surface of the mirrors is damaged by sand storms and other factors.  

   Solar Updraft Tower 

This a concept which utilizes energy of the heated air rising in a very tall pipe with a fans inserted in it, connected to a generator - a sort of vertical wind turbine. Due to its relatively low efficiency and the lack of expertise these kind of systems did not receive wide acceptance in North America.




[to be continued]