Archive for solar thermal

Concentrating Solar Power: An In-Depth Look

I recently interviewed several industry participants and research scientists about Concentrating Solar Power (CSP) and associated thermal storage. 
Several articles came out of these interviews:

Why Concentrating Solar Power Should not Try to be Coal

The Solar Projects that Won’t be Built

What the Future of Concentrated Solar Power Might Look Like (This one made the folks at Ausra uncomfortable, and so they asked to respond.)

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Heating a building with heat from a road

The December 6 Technology Quarterly from The
Economist
magazine profiles
a Dutch office building which is both heated and cooled using heat (or cold) from the asphalt of the road outside the building
, as opposed to the more conventional use of solar thermal panels on the building’s roof.  The article optimistically ends,

The result is cheap heating in winter and cheap cooling in summer. And there is a bonus. Summer heating softens asphalt, making it easier for heavy traffic to damage the road surface. Dr de Bondt’s system not only saves electricity, but also saves the road. Expect to see more examples of it, in other countries, soon.

While this is a very elegant solution, the author fails to grasp that,
because the road is essentially an unglazed thermalOoms collector, and only gets
warm in the summer or cool in the winter, requiring that seasonal heat be stored.   Summer heat from the asphalt is used to heat the building in winter, while the chill of the inter road cools the building in summer. 

In this particular case, seasonal storage is accomplished with heat exchangers placed in not one, but two separate natural aquifers near the building.  The fortunate proximity of two such aquifers is extremely rare.  While this is a very elegant way to heat and cool a building, the lack natural aquifers in which to store seasonal heat will likely prevent widespread adoption of this
technology, no matter what the author believes.

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Transport Fuels and Solar Technologies: Bird’s Eye View

For my last couple AltEnergyStocks Columns, I’ve been taking a step back and looking at how we can get an understanding of the broad trends of energy technologies. Last week, I added to the Visual comparison of Electricity Generation Technologies I did last spring with a new Visual Comparison of Transport Fuels.

Following up, today I published a look at the varius solar technologies through the lens of their applications.

Before we go back to looking at trees, I hope you enjoy this look at the forest.

(and don’t miss the National Tour of Solar Homes next Saturday)

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Denver Tour of Solar Homes Sneak Peak; links to National Tour

Preview the Denver Tour of Solar Homes Online


The Denver area Tour of Solar Homes takes place in less than a month, and this year you can preview some of the buildings involved online. 
Check out the Sneak Preview on the right-hand side of the
Tour of Solar Homes page on the CRES Web site

.

 

The 2007 Tour of Solar Homes will take place on Saturday, October 6 in Denver and most locations around the state.  However, some of the activities are slightly different. 
The Boulder tour will take place on Saturday, September 30. 
And the tour in Pueblo will span two days: October 6 – 7. 
See a complete listing of solar home tours in Colorado on the American Solar Energy Society Web site.

 

National Solar Tour

 

Outside of Colorado, people you can find tour in your own community by visiting the National Solar Home Tour website.

 

Volunteers Needed for the Tour of Solar Homes October 6

CRES needs volunteers to help with the Denver Metro-Area Tour of Solar Homes on Saturday, October 6.  If you step forward, you will assist homeowner with visitors.   

There are two shifts: morning from 8:30 a.m. to 12:30 p.m., and afternoon from noon to 4 p.m.  

Volunteers are welcome to spend the half-day they are not working touring homes themselves. Volunteers are also invited to attend a workshop free of charge from 6 – 8 p.m. Thursday, Oct. 4 titled "Solar Photovoltaics and Xcel Energy’s Solar Rewards Program" and presented by Jeff Scott of SolSource and Juliea Gauthier of Xcel Energy.  The
workshops take place at the National Renewable Energy Laboratory (NREL) Visitor’s Center at 15013 Denver West Parkway in Golden, which is two blocks west of the Denver West Marriott at I-70 and Denver West.

Following the workshop, veteran volunteer John Avenson will give a brief orientation for volunteers about the duties the day of the
Tour of Solar Homes
. To volunteer, contact Patty Roberts via email at: patty at pacificmillimeter dot com

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CSP for Dictators

When I heard
France had offered to provide a nuclear reactor
to power a desalinization
plant in Libya, it knocked me for a loop.  I do believe in carrots to show
countries that we don’t always get along with that there is some reason to be on
our good side, but I fail to see any circumstances under which adding one more
batch of radioactive material (even if not bomb-making grade) in a troubled
region of the world is going to aid our long term security.

If we want to help Gaddafi (or
perhaps pay him off for returning hostages
,) wouldn’t it make more sense to
give him something just a little less dangerous?  Concentrating Solar Power
(CSP) is ideally suited for Libya’s hat and dry climate, and it works well for
desalinization… why not use this opportunity to advance CSP technology, and
not have to worry about proliferation to boot?

That’s the question I ask in my most recent Alternative
Energy Stocks
article.  And while I’m at it, I ask similar questions
about our relations with Iran and North Korea. 

Click
here to read the entire article.

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Visual Comparison of Electricity Generation Technologies

I just put together a couple graphs for a talk I’m giving on Monday to give people a visual feel of the various technologies for generating electricity.  These come with a gigantic caveat: the numbers are far from precise.

With changing technologies, it’s impossible to represent any of this with a single number anyway.  I’m trying to show how the technologies compare to each other, and I used four parameters:

  • Cost ($/MWh),
  • Availability (better the closer the profile of the technology matches a normal demand curve (wind is bad, baseload is okay, dispatchable is best, solar),
  • Emissions (and I count waste storage when it comes to nuclear),
  • Bubble sizes represent the size and durability of the resource (I’ve tried to combine in one number how much power we can get from the resource, but also how long supplies of fuel will last.) 

In both charts, the “best” technologies are in the upper left (low cost, low emissions, and available when we need them.)

I know that I’m going to upset a lot of people because I was too harsh with their favorite technology, so feel free and comment on the numbers I’m using, but also please provide references for where you get your numbers.  Most of these are off the top of my head, so their accuracy is admittedly questionable.   Here are the numbers I used to make the graphs.

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Holistic Approaches to Energy Problems

H. L. Mencken said, “For every human problem, there is a neat, simple solution; and it is always wrong.”  When it comes to solving the problems of peak oil and global warming, I also think that the loudest barking is up the wrong tree.  We look for the quick fix, trying to find a substitute energy source that allows us to change the way we do things little as possible, when the real problem is actually what we’re doing, not how we’re doing it.   We need holistic solutions, not quick fixes.

Too abstract?  Here are some concrete examples:

 Problem: Peak Oil

Quick fixes: Ethanol and slight increases in vehicle efficiency standards.

Holistic solutions: Change our driving culture and infrastructure, by changing the way car use is priced from fixed charges to a per mile basis (“Pay as you drive”).   Removing subsidies to use cars when other forms of transport are available, and redesigning our cities to make them easier to get around on foot, bike, and public transport.  Like other holistic solution, all these steps increase safety and reduce congestion, reduce obesity and associated health problems, as well as reducing the use of gasoline.

Problem: Wind and Solar are intermittent resources, but coal produces too much CO2 and natural gas prices are rising rapidly.

Quick Fixes: Nuclear power and “Clean” Coal.

Holistic Solutions: Shift our demand for electricity to times when it is available, by using time of use pricing, energy storage and demand alignment, and distributed energy storage such as plug in hybrid vehicles.

Investing opportunities:On thing that’s striking about these examples is it’s much easier to find investment opportunities in the quick fixes than in the holitistic solutions.  To invest in ethanol, you can just buy ADM or one of the multitude of ethanol stocks that have been going public recently, but I have yet to come up with a satisfactory way to invest in better urban planning (except buy a house in a walkable community, which is something I’m planning on doing this summer.   Stapleton is the community.  I currently live there, but I’ve been renting and waiting for the end of the housing bubble.  I actually don’t think that housing is going to go up again any time soon, but I’m tired of waiting.) 

The investment landscape is a little better when it comes to energy management.  Itron and Siemens both have divisions that help utilities manage their grids better, and there are many battery and other energy storage companies to choose from.  Still, it’s a lot harder to pick through battery companies than to just buy a nuclear powered utility or uranium miner.

Holistic solutions, by their nature, have weak boundaries… the benefits tend to be diffuse, and spread over society as a whole, so it is difficult to charge fairly for them.  This, I think, is why there are so few companies pursuing them when they can pursue a quick fix that they can charge for up front.  

Companies have an obligation to their shareholders to make money.  It’s our job, as human beings, to work towards regulations that make it easier for companies to make money with holistic solutions that actually solve the problem than it is to make money with quick fixes that just cover the problem up.

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