Let It Shine: The First Solar Steam Engine


| 6/9/2014 10:19:00 AM


Tags: solar power, solar engine, California, John Perlin,

solar steam engine

The following post summarizes the author’s Chapter 7 of Let It Shine: The 6,000-Year Story of Solar Energy.

Alarmed by the prodigious amount of coal consumed as the industrial revolution moved forward, a French mathematics professor, Augustine Mouchot, warned in 1860 that “Eventually industry will no longer find in Europe the resources to satisfy its prodigious expansion…Coal will undoubtedly be used up” He then asked, “What will industry do then?” It must “reap the rays of the sun,” the French professor concluded.

The First Solar Machines

Mouchot first studied what had already been done in times past to put solar energy to use. Mouchot discovered many fascinating solar machines built over the millennia, beginning with a sun-run siphon developed by Hero of Alexandria in the first-century BCE. To produce steam, he found the best combination would be to build a concave mirror that focused on a glass-covered boiler. On its first trial run in 1866, it vaporized enough water to run the world’s first solar-powered steam engine. “It functioned marvelously after an hour exposed to the sun,” he wrote, full of enthusiasm. He went on to construct even larger sun machines.

A reporter described one of his new solar motors on display by the public library at Tours in these words: “The traveler who visits the library of Tours sees in the courtyard in front a strange-looking apparatus. Imagine an immense, truncated cone that looks like a mammoth lamp shade, with its concavity directed skyward.” The reactions was one of amazement – a motor that ran without fuel, on nothing more than sunbeams.

Ice From the Sun With Concentrating Solar

In a later device, Mouchot amazed crowds in Paris by making ice from solar energy. He had connected to the sun motor a heat-powered refrigeration device invented a few years earlier. As Mouchot wrote, “Under a slightly veiled but continually shining sun, I was able, in spite of the seeming paradox, to utilize the rays of the sun to make ice.” While Parisians viewed the experiment as some magic show, Mouchot saw it as something that promised a great opportunity for the future, where sun-generated ice in tropical climates would keep food from spoiling. He was also the first to generate electricity from sunlight.




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