The compressor technology used in today’s refrigerators was invented more than a century ago. "The technology has been continuously optimized over the years, of course," says Daniel Hägele, physicist at Ruhr University Bochum, Germany. "However, recent improvements in energy efficiency classes have mostly involved adjustments like tighter seals on doors." It’s entirely conceivable to introduce techniques for generating cold that are completely different to those currently in use - based on the caloric effect, for example. ...
