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The thermal mass used in Michael Reynolds' design is a combination of a liquid (i.e. water or beer) together with concrete mass. Concrete's temperature can be decreased quickly, while a liquid's (such as beer or water) with its higher thermal mass requires more energy to change temperature, holding the cold for longer.
Among the smallest are Peltier-type refrigerators designed to chill beverages. A large domestic refrigerator stands as tall as a person and may be about one metre (3 ft 3 in) wide with a capacity of 0.6 m 3 (21 cu ft). Refrigerators and freezers may be free standing, or built into a kitchen.
Most modern refrigerators keep the temperature between –40 and –20 °C, and have a maximum payload of around 24,000 kg gross weight (in Europe). Although commercial refrigeration quickly progressed, it had limitations that prevented it from moving into the household. First, most refrigerators were far too large.
Pulse tube coolers are commonly used cryocoolers in dry dilution refrigerators. Dry dilution refrigerators generally follow one of two designs. One design incorporates an inner vacuum can, which is used to initially precool the machine from room temperature down to the base temperature of the pulse tube cooler (using heat-exchange gas).
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