A team of researchers at the Massachusetts Institute of Technology (MIT) has proposed a new energy storage concept, which they claim is far cheaper than current energy storage technologies. The MIT team points to the scalability of its so-called ‘sun in a box’ concept, saying that a single large system could power a small city of 100,000 households around the clock.
The new MIT storage concept taps renewable energy to produce heat, which is then stored as white-hot molten silicon. The U.S. researchers have dubbed the technology Thermal Energy Grid Storage – Multi-Junction Photovoltaics.
The technology uses two large 10-meter wide graphite tanks, which are heavily insulated and filled with liquid silicon. One tank stores silicon at a temperature of 1926°C. The “cold” tank is connected via a bank of tubes and heating elements to a “hot” tank in which liquid silicon at a temperature of 2370°C is stored.
Excess energy from an adjacent PV system, for example, is used to generate heat, via Joule heating – a process by which an electric current passes through a heating element – to bring up the temperature of the “cold” silicon and move it to the hot tank.
When electricity is needed, the molten white-glowing liquid silicon is pumped through an array of tubes that emit light. The tubes are routed past high-efficiency solar cells, called multi-junction photovoltaics, with the light from the molten silicon then being turned back into electricity. Through that process the silicon cools down and flows back into the “cold” tank, to be used again.
“One of the affectionate names people have started calling our concept is ‘sun in a box,’ which was coined by my colleague Shannon Yee at Georgia Tech,” Asegun Henry, the Robert N. Noyce Career Development Associate Professor in the Department of Mechanical Engineering says. “It’s basically an extremely intense light source that’s all contained in a box that traps the heat.”
In the conceptual stages of the technology’s development, which material to make the storage tanks out of was a concern. Potentially using graphite was thought to be a risk due to the possibility that graphite and silicon could react at these high temperatures.
When the team built a miniature tank for testing purposes, they found that while the silicon did react with the graphite to form silicon carbide, the new material stuck to the tank’s inner walls, to create a protective layer. After that thin layer was formed no further reaction occurred, proving that the use of graphite tanks is viable.
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