FIELD: food industry. SUBSTANCE: device is a container with material having a temperature point of change of its phase condition ranging from 17.6 C to 600 C. As the material is heated to the point of change and then cooled down below this point, the material in instable overcooled condition. Heat evolved as crystallization is initiated is used to heat the contents of the jar. EFFECT: higher efficiency. 2 cl, 1 dwg
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