Low Cost Breakthrough Paul Sidlo, one of Sunrgi’s seven founding partners, said his firm has “miniaturized everything.” Sidlo claims miniaturization leads to “reduced cost, and the big breakthrough here is all about lower cost.” In addition to miniaturization, Sidlo said Sunrgi’s system is designed to be manufactured on “slightly modified computer assembly lines,” enabling further savings through high-volume production. These and other cost-saving features will enable Sunrgi’s system to produce electricity at the estimated wholesale cost of five cents per kilowatt-hour, according to Sidlo. In an article in The Technology Review, published by the Massachusetts Institute of Technology, Daniel Friedman, a solar-energy researcher at the U.S. National Renewable Energy Lab, called Sunrgi’s claims “quite aggressive.” Friedman said other solar-cell manufacturers are still working toward seven or eight cents per kilowatt-hour. “I can’t say Sunrgi won’t achieve what it’s claiming, but right now, it’s just on paper, and costs like that are only going to be a reality at the large manufacturing level,” Friedman stated. Handling the Heat At its claimed level of sun concentration, some skeptics point out, Sunrgi’s solar module would generate temperatures exceeding 1800°C – a degree of heat comparable with that of an acetylene torch. How can Sunrgi’s system handle heat that hot? K.R.S. Murthy, the Sunrgi partner called a “thermal wizard” by his colleagues, said cells in such systems are usually cooled through a combination of heat conduction, air or liquid convection and radiation. He noted that the goal is to remove as much heat as quickly as possible. “At each stage of conduction, convection and radiation,” said Murthy, “We’ve made an improvement over what others have done.” For example, Murthy said that a small fluid-filled chamber is connected to the bottom of each cell in Sunrgi’s system. This chamber acts as a heat sink, according to Murthy. It is filled with fluid that contains high-temperature composites and nanomaterials that rapidly remove heat from the cell. This “super cooling” agent, which Murthy will not identify, enables cells to remain about 10°C to 20°C above ambient temperatures or, as Murthy said, “cool enough to work.” Many experts are still dubious and most appear to be taking the “we’ll believe it when we see it” attitude. The doubting Thomases do not deter Sunrgi’s founders, however. Their philosophy seems to be “time will tell.” For now, the seven partners of the self-funded firm are reportedly too busy talking to venture capitalists and prospective manufacturers to think of much else. (Visit: sunrgi.com)
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