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In recent years, specialized 12-volt-DC-operated compressor-type refrigerators have been developed and are being used in some RVs. The typical RV (absorption) refrigerator uses either propane or electricity as a heat source. Most operate on propane or AC (two-way), while some add 12 volts DC (three-way).
Food in a refrigerator with its door open. A refrigerator, commonly shortened to fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room temperature. [1]
Typically the minibar cooling unit was different from standard refrigerators, using absorption technology. An Italian company was the first manufacturer to install a compressor mini-refrigerator in the NASA Space Shuttle in 1982. A compressor refrigeration unit, in addition to a timer and a eutectic plate, allow saving more energy, compared to ...
A small hermetically sealed compressor in a common consumer refrigerator or freezer typically has a rounded steel outer shell permanently welded shut, which seals operating gases inside the system, in this case an R600a refrigerant. There is no route for gases to leak, such as around motor shaft seals.
Common absorption refrigerators use a refrigerant with a very low boiling point (less than −18 °C (0 °F)) just like compressor refrigerators.Compression refrigerators typically use an HCFC or HFC, while absorption refrigerators typically use ammonia or water and need at least a second fluid able to absorb the coolant, the absorbent, respectively water (for ammonia) or brine (for water).
A representative pressure–volume diagram for a refrigeration cycle. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), [1] in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air conditioning of buildings and automobiles.