Posted on Wed Jun 17, 2015 7:19 am.
It’s been 106-108 this week in Vegas. Our south-facing garage has been baking because heat comes right through the garage doors. Happily, garage door insulation is simple to install and really cuts down garage heat on a baking day. It also helps keep garages warm in winter in cold areas.
DIY home improvement videos showed garage door insulation to be highly effective. On a hot day in San Diego, the before temperatures on the inside of uninsulated garage door panels was 105. After installation it was 80. That’s a huge difference.
I used the Reach Barrier insulation. Each $50 box contains eight panels and 48 double-sided adhesive stickees. In install, practice a few times to see how the sheets fits into the panels.. Then, press five stickees on each panel and put the lightweight, insulated aluminum sheet on top on them. The trick is, don’t cut it the sheet to make it fit. Instead, jam any excess size into the grooves in the panel. This helps it stay put.
The sheets are feather weight. I did two garage doors in about 45 minutes. The garage is noticeably cooler this morning.
Posted in Energy
Posted on Sun Jun 14, 2015 12:27 pm.
Intel has installed 58 small wind turbines on the roof of their Santa Clara headquarters to help power the building and to test renewables. The turbines are manufactured by JLM Energy, 6-7 feet tall, weigh 30 lbs., and sited on the edge on the building to gather the most wind, which averages 8-9 mph. Intel, an industry leader in using renewables, also has solar on the roof, and is the largest voluntary user of renewable energy in the country.
Intel has installed 58 micro-turbines atop the roof of their headquarters in Santa Clara, California, in what is a two-fold project aiming at providing renewable energy for the building, as well as acting as a proof of concept project, “in which Intel hopes to collect data that will help the company better understand green power and identify ways to continue evolving its sustainability programs.”
Posted in Energy, Wind turbines
Posted on Fri Jun 5, 2015 10:17 am.
The California Senate just passed a hugely ambitious plan to shift to renewable energy, electric cars, and to combat global warming. The goals are laudable, however there are real questions whether they can be reached without massive, painful disruption to regular Californians. Seriously. Mandating a 50% cut in petroleum use within 15 years means way more electric and alt-energy vehicles, including big rigs. Electric cars require electricity, which means more power plants will need to be built. California is also mandating 50% in-state renewable energy by 2030, which is, um, highly optimistic, as grids now have trouble handling large amounts of always fluctuating renewable energy. Plus, the price of electricity may climb sharply.
California has a long way to go and a short time to get there. This plan is so ambitious they it will either be a hero for achieving or a clown for failing.
“I’m quite dubious about our ability to accomplish these goals we’re getting so many kudos for setting,” said James Sweeney, director of Stanford University’s Precourt Energy Efficiency Center.
“It’s going to be up to future governors and future lawmakers to make these goals work,” Sweeney said. “Unless we come up with a plan that’s not terribly disruptive to average Californians’ lives, they’re never going to follow through.”
If the legislation becomes law, it will be up to the California Air Resources Control Board to implement two of the measures’ toughest goals: cutting petroleum use by cars and trucks in half over the next 15 years and slashing greenhouse gas emissions to 80 percent below 1990 levels over the next 35 years.
Posted in Climate change, Energy
Posted on Tue May 19, 2015 7:00 am.
Tesla’s Powerwall is way too expensive and underpowered to do much of anything except provide a wee bit of power to your house, assuming the sun has been shining, that is. Plus, Tesla is getting huge subsidies, so forget about it being an example of scrappy capitalism bootstrapping new products to market.
But does all the messianic talk of battery-powered “disruption” and solar triumphalism stack up? Hardly. For all their ballyhooed price reductions, Tesla batteries are still way too feeble and expensive to come even within hyping distance of neither a reliable power supply, nor an off-grid revolution.
Contrary to Musk, you would be ill advised to go off the grid with solar panels and batteries. The 10-kWh Powerwall stores enough electricity to supply an average American home, which uses 30 kWh of electricity per day, for all of 8 hours; a day of overcast weather would leave an off-grid solar-plus-Powerwall system without any power at all. And the 10 kWh system can only cycle — charge up with electricity and then discharge — about once per week; it’s designed as a back-up for grid outages, not to store daily household solar generation.
However, Elon Musk is indeed a magician at extracting concessions from government to pay for his projects.
Basically, Tesla is operating tax free for ten years and gets a discount on the electric bill. That’s the invisible hand of capitalism in action.
And please stop telling me that Elon Musk is some kind of visionary. Is he is bad as the Wall Street parasites who are eating our colons from the inside out? No. He’s actually making something. But just because he builds electric cars doesn’t mean he’s Leonardo da Vinci. Stop telling me all of his quirks and personality flaws are symptoms of genius. He seems to me like a full-fledged creature of the modern age: a media savvy techno geek with a Gordon Gekko attitude. Forgive me if I don’t get wet.
Posted in Energy
Posted on Fri May 15, 2015 9:01 am.
Ripasso Energy concentrated solar power focuses the heat of the sun to highly efficient, zero-emissions Stirling engines. A test site in the Kalahari desert has reliably produced energy for four years and achieved a world record solar-to-grid electricity conversion of 32% and, big added bonus, uses no water, a major concern in deserts. By contrast, traditional solar PV has achieved about 15% usable grid power, while other forms of concentrated solar use water to power steam turbines.
The technology works by using the mirrors as giant lenses that focus the sun’s energy to a tiny hot point, which in turn drives a zero-emission Stirling engine.
The Stirling engine was developed by Reverend Robert Stirling in Edinburgh in 1816 as an alternative to the steam engine. It uses alternate heating and cooling of an enclosed gas to drive pistons, which turn a flywheel.
Ripasso says competing with the ever-dropping costs of solar PV is crucial. Their biggest challenge was getting funding from skeptical banks, so they secured private funding instead. Solar power like this would be an ideal way to power desalination plants on the coasts in deserts, as well as homes.
Posted in Energy, Solar power
Posted on Sat May 9, 2015 11:13 am.
Concentrating solar power creates electricity by using the heat of the sun. The heat generally is focused to a central tower or stored in tubes next to parabolic troughs, then used to power turbines, creating electricity. Solar PV is way cheaper than CSP. However CSP has a huge advantage that makes it competitive. Excess heat can be stored in molten salt, then used to generate power when the sun isn’t shining or at night. Specifically, CSP can be used as backup power for solar PV when the sun is setting and demand is generally at its highest.
A ginormous CSP plant in Tunisia will generate 2.5 GW, equal to that big coal and nuclear power plants, when built and send the power to Britain via high-voltage DC cable. The builders say the cost will be competitive although Bloomberg New Energy disagrees.
Contrary to Nur Energie’s estimations, Bloomberg New Energy Finance calculates that most solar thermal plants would need a power-purchase agreement in excess of $200 per megawatt-hour to be commercially viable.
This compares to just under $100 per megawatt-hour for PV “in a similar sunny location,” Chase said. “The only reason anyone would give you that premium is if you were supplying power that matched the demand of the grid you were feeding into better than PV does.”
And that is exactly what CSP does, it provides large amounts of power precisely at the time when solar PV can no longer do so. And this is the only reason it remains viable competition.
This is particularly the case in markets such as South Africa, where there is a need to meet evening demand peaks that PV cannot handle. South African regulators have approved at least half a dozen CSP plants with storage.
BLS explains how CSP works.
Although there are several different CSP technologies, they all involve reflecting sunlight onto a focal point that contains a heat-transfer material. The heat-transfer material, usually synthetic oil or molten salt, is collected in a heat storage unit and eventually used to create steam that powers conventional generators. One advantage of CSP is that at night or on extremely cloudy days, the conventional generators can be run on natural gas or petroleum, allowing the plant to continue to generate power when the sun is not shining.
That’s right. CSP is not completely renewable. The turbines can run off carbon fuel too. However, they are still way greener that say, a coal plant.
Posted in Energy, Solar power
Posted on Fri May 1, 2015 11:50 am.
Elon Musk is a master of PR and hype. You’d think from recent gush of laudatory, uncritical re-written press releases masquerading as journalism that Tesla Energy is doing something new by introducing home batteries. It’s not.
Home battery storage systems have been around for years. Dozens of companies sell them. They are already being used to store rooftop solar PV power, so that’s not a new Tesla idea either.
Rooftop solar with stored power in batteries is a great idea. Just don’t believe the hype and get carried away thinking Tesla is doing something no one else has. This technology has been around for a while. Tesla is the new kid on the block.
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Posted in Energy
Posted on Thu Apr 30, 2015 5:55 am.
Oil and gas wells use large amounts of water, and it’s often boiling hot when it comes back up the pipes. So the oil patch is experimenting with sending that hot water through geothermal heat pumps to create electricity, to be used onsite or sold into the grid. Yes, this is mostly about using about dirty, nasty fracking water but, hey, might as well create clean energy with that water too. With the dropping price of oil, oil companies are looking for ways to make extra income per well.
The team took off-the-shelf geothermal generators and hooked them to pipes carrying boiling waste water. They’re set to flip the switch any day. When they do, large pumps will drive the steaming water through the generators housed in 40-foot (12- meter) containers, producing electricity that could either be used on site or hooked up to power lines and sold to the electricity grid.
Posted in Energy
Posted on Tue Apr 28, 2015 6:30 am.
Water heaters use large amounts of energy. The ability to them control remotely could save substantial amounts of power and money. Congress just passed a law permitting this to be done on a large-scale. Thus, on a hot day, the utility might cut power going to hot water heaters to enable that power to be used for air conditioning demand. Conversely, water heaters could be turned on if there is a temporary oversupply of power. All this happens very quickly in response to supply and demand. The switching back and forth can happen in seconds, or just a few minutes, not long enough to seriously impact available hot water since it only controls some of the power, as shown in the image.
It’s not just utilities that are using water heaters for capacity demand response which are celebrating. Hot water heaters are also increasingly being tested as grid-balancing assets. In Hawaii, water heaters are being tested for frequency regulation and contingency reserves, while in the Pacific Northwest they are being tested to balance wind resources in five-minute intervals.
Here’s how it works.
Grid-interactive water heaters add bidirectional control to electric resistance water heaters, allowing a utility or third-party aggregator to rapidly toggle them off and on. This functionality turns a fleet of water heaters into a flexible energy-storage medium, capable of increasing and decreasing the load on the grid on a second-by-second basis.
GIWHs can’t supply electricity, but they provide exactly the same functionality by reversing this equation: They can modulate the load in order to follow generation. In times of overgeneration, fleets of water heaters can be switched on to absorb excess power, and in times of undergeneration, they can be switched off to shed load and redistribute the existing electricity on the grid. Thus, aggregated GIWHs can act as virtual power plants to quickly and effectively control the amount of power on the grid. Moreover, these fleets are completely scalable and can perform this functionality within seconds.
Posted in Energy
Posted on Wed Apr 15, 2015 9:13 am.
The Carlsbad Desalination Project will be the biggest desal plant in the western hemisphere when it open in November in San Diego. While the price of desalination is dropping, it is still quite expensive and is problematic in two ways. 1) The salt is dumped back into the ocean, adversely affecting marine life. 2) Desal requires large amounts of electricity, which mostly comes from non-renewable sources now, increasing carbon emissions. Also electricity generation often requires substantial amounts of water for cooling. Thus, water is used to generated energy which is used to desalinate water. Hmm.
Renewable energy from wind and PV solar uses practically no water and could be a long-term solution to the interconnected problem of the relationship between water and electricity creation.
The project will generate 50 million gallons of water a day, enough for 7% of San Diego and will cost about $1 billion.
“Desalinated water will be more expensive than imported water when it comes online,” Jones said. “But soon, imported water rates will continue to rise and imported water will be more expensive than desalinated water. And what we need to look at as consumers is what is the cost of not having water at all.”
Paying to offset emissions elsewhere for damage the plant will do is not sustainable or a solution.
The company developing the plant here, Poseidon Water, has promised to counter the environmental damage. For instance, it will pay into a California program that finances projects to offset emissions of greenhouse gases.
Posted in Energy, Water