Forbes – Science
This Dutch Startup Converts Heat Into Cold Via A Stirling Engine, And Could Just Save The Planet
It seems quasi-magical, but the company has been shipping commercial product since last September. SoundEnergy’s first customer was Dubai, which purchased a unit for cooling in a plant which condenses drinkable water from the air. Another government has purchased a unit for cooling in a remote, off-grid space.
One of the reasons why?
This high-tech A/C unit does not itself require power.
“The system itself does not consume electricity/energy,” Hamans told me via email. “It takes 100% of stack-emitted waste energy, or solar thermal … and converts that for 40-50% [efficiency].”
The rest of the heat can get discharged into a cooling pool, or the atmosphere, or, if absolutely required, cooled with a standard A/C unit. The only parts that potentially use external power to run would be a small controller unit for more precise calibration, and of course pumps to circulate heat-bearing fluid in and cold fluid out.
The system is ideal for industrial use where high-temperature motors and equipment needs to be cooled, but can also be used for large multi-family housing units. Large units run about $50,000, though prices will drop with scale, and smaller units for residential/consumer purposes are possible at much lower prices.
Hamans says the systems pay for themselves.
“For commercial and industrial use we are talking about only a few years to five years payback time,” he told me. “[Also factor] in that our systems have an expected life time of 20-30 years, which to our knowledge is substantially longer than electric compressor based systems.”
Financial payback is one thing.
But if the company can help solve the global energy challenges while also helping us cool our homes, offices, and factories efficiently, the environmental payback may very well outweigh the financial considerations.
The company’s next steps?
“Our strategy so far is demonstrating commercial and technical feasibility per industry, upscaling from a few launch customers to multiple, globally,” says Hamans. “These industries include but are not limited to heavy industries like (petro)chemical and process industries, food & beverage, textiles, metal, hydrogen, and mobile/stand alone systems which can operate in remote areas. Further we can also cool spaces/buildings, and cold chains for fresh produce or medical supplies, particularly also in hot areas, grid independent.”
Those are big plans.
But unaffiliated experts believe that the tech is real, and that there is significant opportunity here.
I spoke to Steven Garrett, former professor of acoustics at Penn State. He’s also an adjunct professor at the University of Massachusetts, and an associate researcher at an acoustical lab associated with the University of Mans in France. Garrett knows what he’s talking about: he put a cooler built with related technology into NASA’s space shuttle in 1982, another into a Navy destroyer, and worked with Ben & Jerry’son innovative cooling concepts in the early 2000s.
Garrett strongly vouched for the technology, and especially the originator of it, Kees de Blok.
“There are quacks all over the place in thermo acoustics,” Garrett told me. “But de Blok is better than I am … he is the real thing. What he has done is amazing.”
De Blok is SoundEnergy’s CRO. He also founded Aster Thermoacoustics, a research company formed to explore related technologies.
“You must be critical when examining the field,” Garrett continued. “But de Blok is not a quack. He did not get to that device overnight, and his credibility is the highest in the field.”
The technology is currently in use in multiple facilities around the globe, including a school in the Netherlands. The system is maintenance-free and requires almost no energy to run, according to the school.