Get Water from Air by Using a Windtrap

desert and stars
In Frank Herbert’s book Dune the inhabitants of a desert planet collect water using giant “windtraps,” now we can do the same on earth. Researchers at MIT have built a prototype, which can be easily scaled up, that can capture a lot of water from even the driest of places. Basically, air is filled with moisture and when it flows through the wind collector it comes in contact with a slightly charged surface that sucks the water right from the air. The amount of power needed is negligible, which means that the device can run using only solar panels.

The researchers built a small prototype water collector that contains a thin layer of MOF powder. The powder absorbs water vapor until it is saturated.

“Once you achieve that maximum amount,” Wang says, “you apply some type of heat to the system to release that water.”

And when the water is released, it collects in the bottom of the prototype.

There are other compounds that can suck water from the air, zeolites for example, but Wang says it takes a significant amount of energy to get these materials to release the water. Not so with a MOF device. “The amount of energy required is very low,” she says.

In the prototype, the heat needed to drive the water out of the MOF comes from ambient sunlight — no external power supply is needed.

Read more.
Thanks to the Flea!

Reusing Renewable Power Pieces

Rotterdam

Despite being more efficient and better than other forms of generating electricity renewable power generation does cause waste. The waste isn’t in the form of smog or tailing ponds or even radioactive barrels. When it comes to wind power the waste generated is broken blades, and there are a lot of them!

Rotterdam has taken charge of their ‘wind waste’ by turning it into playground and park equipment. It turns out that the blades used in wind turbines are perfect for making interesting local parks!

In 2007, the Rotterdam municipality unveiled a playground for Kinderparadijs Meidoorn built out of rotor blades that were originally destined for landfills. Several rotor blades were cut up into parts to serve as tunnels, towers, bridges, hills, ramps and slides. The recycled blades were secured into the ground and painted white with brightly colored stripes.

The city also has public seating at the Willemsplein square where nine intact rotor blades were placed at various angles to create ergonomic public seating with a diversity of seating options. Similarly, in 2014, a durable bus shelter was created in the city of Almere, again from end-of-life turbine blades.

According to the GenVind Innovation Consortium, if only 5 percent of the Netherlands’ yearly production of urban furniture such as playgrounds, public seating and bus shelters were made using waste rotor blades, then the country could get rid of all of its estimated 400 waste rotor blades produced annually.

Read more.

Scotland Generated Enough Renewable Energy to Power Itself

This past weekend Scotland generated enough electricity from wind turbines to meet all its power demands. A day of strong winds and low demand combined to make this the first time Scotland has achieved this renewable milestone. For a compression, in 2012 Germany got 50% of it’s electricity from renewable sources, and today Germany gets almost all of its power from renewable sources on a regular basis. In a couple years Scotland could be 100% powered by renewables. The cost of solar and wind installations continues to fall so it’s likely more regions of the world will be able to follow Scotland’s lead.

“It should also be remembered that wind power is not the only renewable power source Scotland has at its disposal.

“If we continue to take steps to reduce our energy demand, invest in storage, and increase our use of renewables we can hopefully look forward to many days that are fully powered by nature.”

The figures showed that wind turbines in Scotland provided 39,545 megawatts per hour (MWh) of electricity to the National Grid for 24 hours on Sunday. Scotland’s total electricity consumption for that day was 37,202MWh. It is unclear whether demand at any single point in the day exceeded the amount supplied by the turbines.

Read more.

Solar and Wind Continue to Succeed, Coal Keeps Failing

Coal continues its downward trend to obsolescence thanks to the rise of installed solar and wind capacity. In many places around the world coal is more expensive than renewable energy and as a result it has driven costs down elsewhere.

The future is clearly one that won’t use coal as an energy resource. We need to keep the carbon in the ground, and we’re slowly starting to leave coal alone.

For the first time, widespread adoption of renewables is effectively lowering the capacity factor for fossil fuels. That’s because once a solar or wind project is built, the marginal cost of the electricity it produces is pretty much zero—free electricity—while coal and gas plants require more fuel for every new watt produced. If you’re a power company with a choice, you choose the free stuff every time.
It’s a self-reinforcing cycle. As more renewables are installed, coal and natural gas plants are used less. As coal and gas are used less, the cost of using them to generate electricity goes up. As the cost of coal and gas power rises, more renewables will be installed.

Read more.

Using Giant Floating Turbines in the Future

Last year we looked at a company testing floating wind turbines in Alaska and how they want to use these turbines in remote locations. The testing seems to be going well and other companies have taken note. The amount of potential energy high in the atmosphere is massive and these floating turbines are well suited to capture that energy.

Over at Gizmodo they looked into the future of how these wind turbines can be used and their potential for transforming how we produce energy.

This is all to say that we use a lot of power, and could probably harness a lot more of it using wind turbines. Which brings us back to the question we started with: What if we changed the climate with wind turbines? I know this sounds totally crazy, but I swear to you this is something that scientists have actually looked into. So naturally, I talked to one of those scientists.

Read more.