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A 'thermal battery' for villages in India | Cutting Edge - CNET News: The thermal battery is a large container that stores a specially designed liquid that doesn't freeze, even below the freezing point. People pour milk, which has just been milked from cows, onto a cylinder-shaped tank, which is cooled by the thermal battery's liquid. As the milk flows over the cylinder, it's rapidly chilled to an appropriate temperature for storing.
And when the grid is not available, the thermal battery can run for several hours on a car battery, and so it avoids dirty diesel generators. The first machines Promethean Power will deploy are roughly the size of a large refrigerator. To remove heat from the cooling liquid, it circulates through a traditional compressor loop, the same used in heat pumps, air conditioners, and refrigerators, White explained.
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