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GE wants to use carbon dioxide from the atmosphere as a means of storing solar energy

Carbon dioxide has been captured and stored by scientists for years, but now GE has a novel idea for how to put this stored CO2 to use.

March 11, 2016 |


Carbon dioxide has become far too prevalent in our atmosphere and is a large component of greenhouse gases that many believe are responsible for climate change. But what if this excess carbon dioxide could be harvested from the atmosphere, repurposed, and used to make a clean, renewable energy source that already exists more efficient?

It sounds like a plan Doc Brown would have concocted and then hurriedly told Marty McFly about as a group of angry terrorists bared down on them, but this isn’t the stuff of science fiction like a flux capacitor, this is very much based in reality.

GE believes it has found a way to harvest CO2 and use it to create solar batteries, reports. Solar energy is a great source of renewable energy, but there is a problem: the sun needs to be shining in order to harness its power. Currently, there isn’t a very efficient means of storing energy produced from solar power to keep it available to the grid whenever it is needed, even if the sun isn’t currently shining, but that could all change.

Here is how the two-stage process works: solar energy would be captured and stored in a liquid of molten salt. Harvested and stored CO2 would then be cooled into dry ice and, when power is needed, the salt would turn the dry ice CO2 into a “supercritical” fluid (which is defined as matter that does not have specific liquid or gas phases). This supercritical fluid would then flow into a CO2 turbine called a sunrotor and the energy would be disseminated as needed.

If it seems complicated, well, that’s probably because it is. But don’t worry, just because something being complicated often times means it is inefficient and/or expensive, that isn’t the case here.

Not only would the process be cheap since energy isn’t being made, just transferred, the sunrotors would also be able to operate with 68% efficiency. Gas power plants are typically only able to achieve 61% efficiency.

However, this process and the sunrotors are still a good five to 10 years away from actually being put into use, but the fact that the technology exists to not only suck some CO2 out of the atmosphere but to also use it to make renewable, clean energy sources more efficient and practical makes this a classic two birds with one stone scenario.

The overall effect of these sunrotors and this CO2 harvesting/storing process is reduced usage of fossil fuels for power generation, which would only work to eliminate even more CO2 from the atmosphere.

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