Posts tagged: Caldeira

Global Warming & Global Power? Wind can power and even cool down the world!

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By stekgr, September 21, 2012 11:22 am

Translated from Massimo Ippolito’s post:

On September 9th NATURE CLIMATE CHANGE Journal published a paper by Ken Caldeira, Kate Marvel, Ben Kravitz containing further confirmation of KiteGen positions and other brand new information of great importance. The following day, as a logical consequence and necessary act, we sent two letters to the Italian government with the proposed solution for ALCOA. Maybe it was an act too confident about the immediate impact of the NCC’s work and the good media coverage obtained by the article[Short video that introduces the study].

We counted on the contents of the scientific paper, full of meaningful information, in order to provide support to the economic arguments regarding the natural source and our technology. We thought that the Italian Minister of Economic Development Corrado Passera would jump up from his chair saying “Here’s the solution!”, instead, so far, all we heard through journalists is a skeptical comment.

Now let’s try to in this article to analyze the work of Caldeira, Marvel and Kravitz maybe step by step in several posts, of course well-reasoned comments from the readers are welcome.

Climate Change and Global Warming/Cooling?

The blog linked here (Italian), written by Physics and Mathematics professor Marco Pagani, identified and highlighted an aspect of the NCC work that turns out to be a novelty, perhaps a safety anchor of great relevance in relation to climate change/global warming. The graph analyzed by Pagani explains how it is possible to extract enough energy to power humanity with negligible changes in atmosphere temperature, while it is even possible to cool down the atmosphere if we could extract roughly 430TW (20 times humanity’s need) from the wind. The essential point is that Caldeira et all, clearly state that we can use as much wind power as we want, with negligible consequences to the climate, and that the only limits to wind energy technology might be relative to their costs and efficiency. While an extensive usage of this source might even be a solution to global warming.

How much can we get from wind?

Beside of climate change discussions, according to scientific publications and substantially confirmed by this latest paper, above Italy flows a total power whose magnitude is around the 100 TW. Let set 1TW as maximum extractable power from Italy, or an arbitrary 1% of what naturally flows, for the pleasure of round numbers and in order to offer a significant metaphor. Saudi Arabia produces 12.5 million barrels of oil per day, 521,000 barrels per hour, the thermal power equivalent of about 1 TW, equivalent to what hypothesized that we can extract from the Italian tropospheric wind while limiting climatic changes. This is great, isn’t it? Check the calculations if you do not believe it, they are fairly easy.

Technically we also have so much solar radiation, but to collect it we need devices deployed on the territory, while for wind power the photovoltaickinetic panel is the atmosphere itself! Already naturally deployed and maintained, KiteGen is only the PTO that collects the energy collected from the atmosphere.

I would like to highlight another graph showing in particular the advantage of tropospheric wind.

KEE vs drag area graph

The blue line is attributable to KiteGen, the red line is attributable to wind turbines. The vertical axis indicates the size of the surface that intercepts the wind, compared with the rate of extraction of kinetic energy on the abscissa.

In order to draw a power of 480TW, each kilometer cube of the entire surface of the planet must have a “classic” wind turbine that catches a wind front of 10000square meters, one hectare, while in the tropospheric wind are sufficient equivalent of 23 square meters for km cube.

The tropospheric wind, however, is not limited to cubic kilometer near the ground, but the study uses ideally the whole atmosphere, and to clarify the calculation of the equivalence of the surface of 23 square meters must be multiplied by the number of stacked cubes, typically 10, corresponding to the entire troposphere.

So a wing brushes 230 square meters in altitude would be equivalent to a wind turbine that works against a wind surface of a hectare.

We said “wing brushing a surface”, but how big must the wing be?

A simplified method is to divide the area to be swept with the same aerodynamic efficiency of a wing with efficiency 10 so that we will have an area of ​​23 square meters equivalent to a 2.5 MW classic wind turbine typically “brushing” one hectare of wind.

The practical and technological interest is to obtain the desired power in an ideal compromise between workload and surface, which is why we chose the KiteGen Stem flying below 2000 meters with wings up to 150 meters of surface.

The fluidity of data and KiteGen performance, which depend heavily on configuration decisions: the wing, the altitude and the wind speed; are obviously one of the things that annoy people used to precise specifications, these people instead of enjoying the freedom of modulation and opportunities they tend to be cautious over the whole project, probably the view also of some government consultant.

In fact, in this latest media coverage, as I said, the only comment we heard from the Ministry that should support us (Innovation & Economic Development) was a very general kind of skeptical comment on KiteGen technology. Personally, it seems that politicians are no longer able to think independently without the lobbies that hound them constantly. Those sectors who has not created a lobby is excluded from all reasoning and opportunities, even if it is for the benefit of the country and the community.

But if it would be clear to everyone that we have the equivalent of a Saudi Arabia within the national territory, would we still be asking questions at the level of bankers, executives, politicians, ministers regarding the particular system of drilling to extract that energy and how to achieve it?

No! please, is complex, just trust all the patents “Granted”, the awards and the 12 proposals in response to calls for national and regional technological innovation, awarded funding but unfortunately still without coverage. Instead put us in a condition where we can keep working and we will solve all of your doubts.

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