Promethean Power co-founder Sam White (left) and engineer Ross Schultz stand in front of a prototype thermal battery. The cold liquid circulates from the battery behind them to the cylinder next to it to rapidly cool milk. The cold working fluid is then circulated to a traditional compressor to cool it again. By having this stored cold liquid, milk processors can chill milk even when the grid is not operating, avoiding diesel generators and allowing them to collect milk at more times.
January 29, 2012 4:00 AM PST
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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