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Old March 26th, 2015, 06:01 PM   #41
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How cold air will change climate around the tower ?
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Old April 3rd, 2015, 01:51 AM   #42
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I don't know, haven't read anywhere about the extent of the building's temperature impact. The air that will leave this tower will be cooler, but also moister. Higher moisture makes lower temperatures appear warmer to the human body (which is called the humidex), so overall I don't know what the effect will be

Btw, here are some news I just found. Looks like this tower might be a true treasure for Arizona's job market

Report: Arizona ranked high for number of renewable-energy jobs

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Thursday, March 5, 2015
Cronkite News

Renewable rankings
The top 10 states for renewable-energy job announcements in 2014, the number of estimated jobs and number of announcements for each.

• Nevada: 8,591; 6 announcements
• California: 7,323; 23 announcements
• New York: 7,175; 12 announcements
• Michigan: 3,628; 6 announcements
• Arizona: 3,402 jobs; 8 announcements
• Texas: 1,789 jobs; 14 announcements
• Colorado: 1,583 jobs; 5 announcements
• North Carolina: 1,420 jobs; 11 announcements
• Utah: 1,210 jobs; 2 announcements
• New Mexico: 1,148 jobs; 5 announcements

WASHINGTON – Arizona had the fifth-highest number of clean-energy jobs posted in the nation in 2014, driven by strong numbers in the first half of the year, according to a report released Thursday.

The report by Environmental Entrepreneurs – which does not track actual hiring but the number of renewable-energy job announcements instead – said Arizona companies announced plans to hire 3,402 last year, out of nearly 47,000 nationwide.

“Arizona is always in the top of the stack with renewable jobs because we do have a diverse energy portfolio,” said Susan Bitter Smith, chairman of the Arizona Corporation Commission.

Almost all of the jobs estimated for Arizona were solar-energy related, with most of those coming from the planned Solar Wind Energy Tower in San Luis, which could create 2,350 jobs, according to its backers.

If built, it would be the first hybrid solar and wind energy technology on the market, developers said. The tower would mist desert-heated air at the top of the tower, cooling it and forcing it naturally down, where it would rush past turbines at the base, generating electricity in the process.

The location in San Luis – with its plentiful sunshine and subsequent hot desert air – is key to the operation of the tower.

Other Arizona jobs that made the report were more traditional solar-array construction jobs at Davis-Monthan and Luke Air Force bases.

On top of the rankings was Nevada, which got credit for 8,591 jobs, about 6,000 of which were tied to Tesla Motors planned “Gigafactory” to build batteries in the state for the electric car manufacturer. New York got a large boost from a proposed solar-cell factory in Buffalo that could create 5,000 jobs.

California didn’t have any one large project, but still finished between Nevada and New York.

“We fluctuate each year with Nevada and California due to completions and starts of big solar projects,” Bitter Smith said. “So as construction cycles vary, we move around in the rankings a bit.”

All of Arizona’s renewable-energy job announcements came in the first half of last year, with none coming after June.

“Arizona’s high ranking for the year was based upon announcements that happened in the first half of the year,” said Jeff Benzak, of Environmental Entrepreneurs. “We did not track any announcements in the state in the two most recent quarters.”

That early surge was still enough to land Arizona in fifth place for the year.
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Old April 16th, 2015, 10:39 PM   #43
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Hey folks, time to give a potential first American magetall some love again

This Tower Of Power Is A Weather Machine

Wind turbines are a great way to generate electricity...until the wind stops blowing. Maybe what we really need is a way to manufacture wind to keep those turbines spinning all the time.

That's the idea that Maryland-based Solar Wind Energy is pitching to the alternative energy crowd, while armchair physicists and perpetual motion machine truthers speculate on whether a weather machine built on an epic scale could ever make sense.

The design of the company's Downdraft Tower is really quite simple. First you build an enormous silo more than 2,200 feet high and 1,200 feet across in a hot, dry place. (It would be around 500 feet shy of Dubai's Burj Khalifa skyscraper, the world's tallest tower.) Then you pump water to the top, and spray a fine mist inside. That mist cools the rising hot air, making it heavier and causing it to plummet down through the tower, creating a 50 mph wind that blasts through turbines positioned all around the base. The tower would essentially be creating the same kind of microbursts that flatten trees during severe thunderstorms, but it would be generating electricity instead of chewing up the landscape.

Would you like one in your town? The mayor of hot and sunny San Luis, Arizona would, so that's where Solar Wind Energy is collecting permits in the hope of turning its privately-funded, $1.5 billion dollar dream into a reality by 2018, on the site of a former citrus grove.

How much electricity are we talking about? While the company claims that the ultimate tower working optimally could generate a whopping 2,500 megawatt-hours per hour, with one third of the power diverted to run the water pumps, a more realistic annual average might be around 435 megawatt-hours per hour of sellable juice. Executives from Solar Wind Energy say that the output would be about the same as that of Hoover Dam, although skeptics have come to some less optimistic conclusions. One point of contention: wind speed. Would the falling air meet resistance inside the tower that would slow it down, delivering insufficient velocity for the turbines to work well?

The company states that similarly powerful solar or wind farms would require from 30 to 300 times as much land, cost four times as much to build, and would have half the usable life of a tower. Even better, it says, a tower can operate 24 hours a day, seven days a week, although it's unclear how much oomph it would lose during the cooler nighttime hours.

Also unclear is exactly how much water would be needed, where it would come from (perhaps desalinated water from the Sea of Cortez, about 40 miles away), how much power it would take to pump it almost half a mile straight up, and how much of it could be re-circulated (the company claims 75 percent). On this point, the company says only that the citrus grove the tower replaces used twice as much water. Critics also wonder if a simpler solar chimney design, in which hot air rises to drive turbines at the top of a tower, wouldn't be more feasible, if only because water wouldn't play a role.

So the Downdraft Tower is colossal, it's clever, it's clean, and it's carbon-neutral. But will it be looming on the Arizona horizon in just three years? That certainly seems like a tall order.
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Old April 27th, 2016, 04:43 AM   #44
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This version of the tower is terrible as it wastes a lot of water which will be absorbed into the air in a place where the water is scarce. It takes a hell of a lot of energy to pump water that high.

Solar updraft towers use greenhouses at the base to heat air and have it rush along the sloped roof to the center. That has already been proven to work with a 750 foot tall temporary version in Spain.
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Old April 27th, 2016, 06:17 PM   #45
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I bet a beer this will never build
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Old April 27th, 2016, 09:40 PM   #46
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"megawatt-hours per hour"? We have a word for that: megawatts.
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