This photo shows a compressor, the type used in a refrigerator or air conditioner. In this prototype system, it's used to remove heat from the chilling liquid of the thermal battery and circulate it back in. As the printed "Mooo!" indicates, this system is designed specifically for chilling milk but the basic thermal battery technique can be used for other applications, particularly where there is not reliable grid service.
January 29, 2012 4:00 AM PST
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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