[ExI] solar power tower

[Max More]

Where is this solar tower sited? I didn't see mention of that. If it's not
far from Phoenix/Scottsdale, I'd be curious to visit when (if) it's under
construction.

I haven't been a big fan of solar, although the technology and economics are
gradually becoming more favorable. If there's any place that it's feasible,
Arizona is the place. We had around 108 degrees today which -- unlike the
freak temps elsewhere in the USA currently -- is quite normal here.

Covering part of Alcor's roof with solar cells might be worthwhile. We don't
need electricity for patient storage purposes, of course, but it could help
with reducing air conditioning bills. We will have to see what the payback
period is, at current prices.

--Max

On Fri, Jul 22, 2011 at 11:20 PM, Damien Broderick <thespike at satx.rr.com>wrote:

> More Aussie smartness  :)
>
> (Unless some big bad wolf comes by, of course, and blows the thing down the
> moment everyone depends on it.)
> ..............................**..............................**
> ............
> <http://www.gizmag.com/**enviromission-solar-tower-**arizona-clean-energy-
> **renewable/19287/<http://www.gizmag.com/enviromission-solar-tower-arizona-clean-energy-renewable/19287/>
> >
>
> Twice the Height of the Empire State - EnviroMission Plans Massive Solar
> Tower for Arizona
> LOZ BLAIN - GizMag
>
> Click through to look at the pictures and view the videinterview with
> EnviroMission CEO Roger Davey.
>
> An ambitious solar energy project on a massive scale is about to get
> underway in the Arizona desert. EnviroMission is undergoing land acquisition
> and site-specific engineering to build its first full-scale solar tower -
> and when we say full-scale, we mean it! The mammoth 800-plus meter (2625 ft)
> tall tower will instantly become one of the world's tallest buildings. Its
> 200-megawatt power generation capacity will reliably feed the grid with
> enough power for 150,000 US homes, and once it's built, it can be expected
> to more or less sit there producing clean, renewable power with virtually no
> maintenance until it's more than 80 years old. In the video after the jump,
> EnviroMission CEO Roger Davey explains the solar tower technology, the
> Arizona project and why he couldn't get it built at home in Australia.
>
> EnviroMission's solar tower: coming to Arizona in 2015
> EnviroMission's solar tower: coming to Arizona in 2015
> EnviroMission's solar tower: coming to Arizona in 2015
> EnviroMission's solar tower: coming to Arizona in 2015
> View all
>
> How Solar Towers Work
>
> Enviromission's solar tower is a simple idea taken to gigantic proportions.
> The sun beats down on a large covered greenhouse area at the bottom, warming
> the air underneath it. Hot air wants to rise, so there's a central point for
> it to rush towards and escape; the tower in the middle. And there's a bunch
> of turbines at the base of the tower that generate electricity from that
> natural updraft.
>
> It's hard to envisage that sort of system working effectively until you
> tweak the temperature variables and scale the whole thing up. Put this tower
> in a hot desert area, where the daytime surface temperature sits at around
> 40 degrees Celsius (104 F), and add in the greenhouse effect and you've got
> a temperature under your collector somewhere around 80-90 degrees (176-194
> F). Scale your collector greenhouse out to a several hundred-meter radius
> around the tower, and you're generating a substantial volume of hot air.
>
> Then, raise that tower up so that it's hundreds of meters in the air -
> because for every hundred metres you go up from the surface, the ambient
> temperature drops by about 1 degree. The greater the temperature
> differential, the harder the tower sucks up that hot air at the bottom - and
> the more energy you can generate through the turbines.
>
> The advantages of this kind of power source are clear:
> -- Because it works on temperature differential, not absolute temperature,
> it works in any weather;
> -- Because the heat of the day warms the ground up so much, it continues
> working at night;
> -- Because you want large tracts of hot, dry land for best results, you can
> build it on more or less useless land in the desert;
> -- It requires virtually no maintenance - apart from a bit of turbine
> servicing now and then, the tower "just works" once it's going, and lasts as
> long as its structure stays standing;
> -- It uses no 'feed stock' - no coal, no uranium, nothing but air and
> sunlight;
> -- It emits absolutely no pollution - the only emission is warm air at the
> top of the tower. In fact, because you're creating a greenhouse underneath,
> it actually turns out to be remarkably good for growing vegetation under
> there.
>
> The Arizona Project
>
> While this is not the first solar tower that has been built (a small-scale
> test rig in Spain proved the technology more than a decade ago)
> EnviroMission has chosen to build its first full-scale power plant in the
> deserts of Arizona, USA.
>
> The Arizona tower will be a staggering 800 metres or so tall - just 30
> meters shorter than the colossal Burj Khalifa in Dubai, the world's tallest
> man-made structure. To put that in context - it will stand more than double
> the height of the Empire State building in New York City, and it'll be as
> much as 130 meters in diameter at the top. Truly a gigantic structure.
>
> Currently undergoing site-specific engineering and land acquisition,
> EnviroMission estimates the tower will cost around US$750 million to build.
> It will generate a peak of 200 megawatts, and run at an efficiency of around
> 60% - vastly more efficient and reliable than other renewable energy
> sources.
>
> The output has already been pre-sold - the Southern California Public Power
> Authority recently signed a 30-year power purchase agreement with
> EnviroMission that will effectively allow the tower to provide enough energy
> for an estimated 150,000 US homes. Financial modelling projects that the
> tower will pay off its purchase price in just 11 years - and the engineering
> team are shooting for a structure that will stand for 80 years or more.
>
> Considering that a large city like Los Angeles requires total power in the
> region of 7,200 megawatts, you'd have to build a few dozen solar towers up
> to the same size as the Arizona project if you wanted to completely replace
> the existing, primarily coal-based energy supply for that city's 3.7
> million-odd residents. So it's not an instant solution - but then, its short
> projected payback period and virtually zero operating costs make it a very
> sound economic proposition that competes favorably against other renewable
> sources.
>
> Under the terms of the pre-purchase agreement, the Arizona tower is due to
> begin delivering power at the start of 2015.
>
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-- 
Max More
Strategic Philosopher
Co-editor, *The Transhumanist Reader*
CEO, Alcor Life Extension Foundation
7895 E. Acoma Dr # 110
Scottsdale, AZ 85260
480/905-1906 ext 113
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