Could thermophotovoltaic cells spell the end for steam engines? 🧐
, the new engine shares some common characteristics with traditional photovoltaic cells, but it captures high-energy photons from a white-hot source to generate electricity. This new engine is able to generate power from temperatures between 3,400 and 4,300 degrees Fahrenheit .
Once that has been achieved, they then hope to scale the thing up with the long-term goal of replacing“Thermophotovoltaic cells were the last key step toward demonstrating that thermal batteries are a viable concept,” explains Asegun Henry, the Robert N. Noyce Career Development Professor in MIT’s Department of Mechanical Engineering. “This is an absolutely critical step on the path to proliferate renewable energy and get to a fully decarbonized grid.
Typically, steam turbines are able to use around 35% of the energy provided by their heat source into useful electricity, with some engines able to provide efficiencies of up to 60%. This is great, but steam turbines suffer from one major weakness - they require moving parts that can break down over time. Parts must also be able to tolerate high temperatures for long periods of time. Parts will eventually wear out over time.
“One of the advantages of solid-state energy converters [is] that they can operate at higher temperatures with lower maintenance costs because they have no moving parts,” Henry added. “They just sit there and reliably generate electricity.”
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