Combat Global Warming with Evaporative Cooling - by Sam Carana
To combat global warming, wind turbines along the coastline could be used for the dual purposes of generating electricity at times when there is wind and evaporating water at times when there is no wind. Just a small breeze over the water can give the top water molecules enough kinetic energy to overcome their mutual attraction, resulting in evaporation of water and associated cooling of both water and air.
Such dual use of wind turbines can be implemented at many places where turbines overlook water; evaporation will work most effectively in hot and dry areas, such as where deserts or dry areas meet the sea or lakes. Evaporative cooling will add humidity to the air, which can also cause some extra rain and thus increase fertility of such dry areas as a beneficial side effect.
The energy needed to run the turbines can be obtained and stored in a number of clean, safe and renewable ways. At times when there is plenty of wind, surplus energy from the turbines could be used to convert water into hydrogen by means of electrolysis. Alternatively, bio-waste could be burned by means of pyrolysis to create both hydrogen and agrichar, which could be used to enrich soils. The hydrogen could be kept stored either in either compressed or liquid form, ready to power fuel cells that can drive the turbines at any time, day or night. Another alternative is to run the turbines on surplus electricity that concentrated solar thermal power plants in the desert may produce during the day.
Finally, there are some environmental concerns about wind turbines. There are concerns about carbon dioxide being released into the atmosphere in the process of making the concrete for the turbines. To overcome this, turbines could be made using alternative manufacturing processes, which can be carbon-negative. Furthermore, a recently completed Danish study using infrared monitoring found that seabirds steer clear of offshore wind turbines and are remarkably adept at avoiding the rotors.
In conclusion, wind turbines have a tremendous potential. They can potentially generate 72 TW, or over fifteen times the world's current energy use and 40 times the world's current electricity use. Offshore and near-shore turbines can make seawater evaporate and thus cool the planet, at times when they are not used to generate electricity.
References:
Wind power - Wikipedia
http://en.wikipedia.org/wiki/Wind_power
Evaluation of global wind power
http://www.stanford.edu/group/efmh/winds/global_winds.html
Solar power and electric cars, a winning combination!
http://www.gather.com/viewArticle.jsp?articleId=281474977115548
Agrichar
http://www.gather.com/viewArticle.jsp?articleId=281474977139103
Alternative method of manufacturing concrete
http://www.tececo.com/
Massive Offshore Wind Turbines Safe for Birds
http://www.technologyreview.com/Energy/18167/
Footnote:
This article was written by Sam Carana; it can be freely copied and published elsewhere, as long as the autor's name is retained in the article.


Comments: 25
Concrete = sand, gravel, cement, water. That's it. Where's the Co2 thats going to be released into the air?
The production of cement, the primary component of concrete, accounts for 5 to 10 percent of the world's total carbon dioxide emissions, according to M.I.T.
There's a link underneath the article to a carbon-negative method of manufacturing concrete.
Similarly, as wind turbines capture the energy contained in the wind and as this energy remains stored in the form of hydrogen, this will have a slight cooling effect, as opposed to the energy of the wind heating up rocks and trees by means of friction.
Greater humidity thus produced could cause more rain to fall in arid areas, causing vegetation there to grow better, holding the water longer and capturing carbon from the atmosphere in the process. As the artticle says, evaporation will work most effectively in hot and dry areas, such as where deserts or dry areas meet the sea or lakes. Solar power from such a desert could run the turbines and, as more vegetation will grow, the temperature will go down there and the area will be able to produce food, etc.
I commend Gaia's Garden, by Toby Hemenway, the cover of which is a converted lawn in Los Alamos, New Mexico, which illustrates the point.
New Mexico also has some wonderful left-over projects from the 70's. My son lived in a house with a trombe wall which produced the most wonderful heat. Apparently double-glazing heated it up too much, and someone removed the second layer of glass.
Another interesting idea for creating heat is the use of compost. It is possible to run coils that heat water through compost. In areas where yard debris and leaf fall are great, this could be an option.
Living roofs are another choice. They provide insulation and evaporative cooling. The most common plants for living roofs are sedums, which can store water. Some kinds of sedum are edible as well.
Thanks for the posting. I gave you a ten.
Good article
Also, the first thing that springs to mind about keeping turbines turning is that it will cost energy. People are not used to think about solutions that cost energy, we all try to save electricity now because most electricity now comes from polluting coal-fired power plants. But once we've made the shift to better alternatives, there will be an abundance of clean, safe and renewable energy that is available on demand day and night. We need to think in terms of such an abundance of electricity, because we'll need plenty of electricity in future, not merely to replace the energy now generated by coal-fired power plants, but also to power electric cars, to power water desalination plants, to create hydrogen, for temperature management in buildings as well as in the greenhouses we need in our gardens, etc.
Sorry Sam, I'd have to see something to validate this claim before I could believe it.
I wonder why, we don't see more of this already.
Two words Vickey-- "FINANCIAL VIABILITY."
Wind power - Wikipedia
http://en.wikipedia.org/wiki/Wind_power
Evaluation of global wind power
http://www.stanford.edu/group/efmh/winds/global_winds.html
On financial viability, the way this is so frequently pictured by those who make profits from fossil fuel and nuclear power does exclude important cost elements such as police and military support, compensation of victims and environmental damage. For some recent discussions on this, check my my recent article the Nuclear Delusion.
Let me explain the latter. When there's much wind at night, offshore wind turbines could produce more energy then is needed on the grid. Such surplus power could be stored and - at times when there's little wind - used to pump up sea water and have this sprayed by the turbines as a fine mist over the water. This spray will contain tiny particles of sea-salt that get sucked up into the air, especially when there's little wind and sunshine causes rising currents of air. These little salt particles will attract further droplets of water from the surrounding air, forming clouds that are lighter in color from space than sea water (see albedo comparison below, from Wikipedia).
In early 2006, I wondered to what extent such increased cloud coverage could mitigate global warming. On the one hand, the extra clouds will reflect more sunlight back into space, but on the other hand water vapor is itself a greenhouse gas. While the albedo difference between clouds and sea water is obvious, some of the evaporated water could rise higher up into the atmosphere and increase humidity of cirrus clouds at high
altitudes, thus trapping the heat underneath and heating up Earth even further through the greenhouse effect. Also, such evaporation could cause unwanted salty rain to fall over land.
Has anyone done any modeling on this?
Cheers! Sam Carana.
Has anyone seen any research that might be applicable to these ideas?
Cheers, Sam Carana