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The history of refrigeration
Refrigeration is the action of creating cooling conditions by removing heat. It is used for preserving food by slowing bacteria growth.
- Around 1000BC, the Chinese used to cut and store ice.
- Five hundred years later, the Egyptians and Indians left earthenware pots out during cold nights to make ice.
- In the 17th century, it was found that saltpeter dissolved in water creates cooling conditions.
- In the 18th century, Europeans collected ice in winter, salted it, wrapped it in flannel, and stored it underground for months. Ice was even shipped around the world.
- People also used cool cellars or placed goods underwater.
- Others built ice boxes out of wood, lined with tin or zinc, and insulated with cork, sawdust, or seaweed, and filled with snow or ice.
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Refrigerators of the future
New technologies in refrigeration include solid-state refrigerators and refrigerators that use magnets.
- Solid-state refrigerators use the refrigerator's entire surface to slowly get rid of the heat. Solid-state refrigerators are also free from harmful materials and l...
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Evaporative cooling
- 1720s. Scottish doctor William Cullen saw that evaporation had a cooling effect.
- 1748. Cullen demonstrated his ideas by evaporating ethyl ether in a vacuum.
- 1805. Oliver Evans designed a refrigeration machine that used v...
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How refrigerators work
Refrigerators today work by evaporating liquids.
The liquids are pushed through the refrigerator through tubes and begin to vaporize. As the liquids evaporate, they carry heat away with them as the gases travel to a coil outside the refrigerator. Here the heat is released....
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Refrigerator safety
- The first refrigerators contained flammable, toxic, and highly reactive liquids and gasses.
- Most refrigerators use hydrofluorocarbons (HFCs), which are safer than Chlorofluorocarbons (CFCs). CFCs are known to be harmful to the ozone layer.
- Refrigerators should be set at a ...
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