Refrigeration | Wikipedia audio article
Channel: wikipedia tts
Date: 10/12/2018

This is an audio version of the Wikipedia Article:
Refrigeration


00:02:26 1 History
00:02:35 1.1 Earliest forms of cooling
00:04:34 1.2 Ice harvesting
00:06:37 1.3 Refrigeration research
00:11:53 1.4 Commercial use
00:17:16 1.5 Home and consumer use
00:19:47 2 Impact on settlement patterns
00:20:34 2.1 Refrigerated rail cars
00:23:17 2.2 Expansion west and into rural areas
00:25:35 2.3 Rise of the galactic city
00:27:00 3 Impact on agriculture and food production
00:28:05 3.1 Demographics
00:29:17 3.2 Meat packing and trade
00:30:58 3.3 Electricity in rural areas
00:32:29 3.4 Farm use
00:33:02 4 Effects on lifestyle and diet
00:34:04 4.1 Impact on nutrition
00:35:22 5 Current applications of refrigeration
00:37:44 6 Methods of refrigeration
00:38:01 6.1 Non-cyclic refrigeration
00:38:36 6.2 Cyclic refrigeration
00:40:25 6.2.1 Vapor-compression cycle
00:42:27 6.2.2 Vapor absorption cycle
00:43:55 6.2.3 Gas cycle
00:45:19 6.3 Thermoelectric refrigeration
00:45:43 6.4 Magnetic refrigeration
00:46:51 6.5 Other methods
00:47:46 6.6 Elastocaloric Refrigeration
00:50:05 6.7 Fridge Gate
00:51:25 6.8 Passive Systems
00:51:55 7 Capacity ratings



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SUMMARY
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Refrigeration is a process of removing heat from a low-temperature reservoir and transferring it to a high-temperature reservoir. The work of heat transfer is traditionally driven by mechanical means, but can also be driven by heat, magnetism, electricity, laser, or other means. Refrigeration has many applications, including, but not limited to: household refrigerators, industrial freezers, cryogenics, and air conditioning. Heat pumps may use the heat output of the refrigeration process, and also may be designed to be reversible, but are otherwise similar to air conditioning units.
Refrigeration has had a large impact on industry, lifestyle, agriculture, and settlement patterns. The idea of preserving food dates back to at least the ancient Roman and Chinese empires. However, mechanical refrigeration technology has rapidly evolved in the last century, from ice harvesting to temperature-controlled rail cars. The introduction of refrigerated rail cars contributed to the westward expansion of the United States, allowing settlement in areas that were not on main transport channels such as rivers, harbors, or valley trails. Settlements were also developing in infertile parts of the country, filled with newly discovered  natural resources. These new settlement patterns sparked the building of large cities which are able to thrive in areas that were otherwise thought to be inhospitable, such as Houston, Texas, and Las Vegas, Nevada.  In most developed countries, cities are heavily dependent upon refrigeration in supermarkets, in order to obtain their food for daily consumption. The increase in food sources has led to a larger concentration of agricultural sales coming from a smaller percentage of existing farms. Farms today have a much larger output per person in comparison to the late 1800s. This has resulted in new food sources available to entire populations, which has had a large impact on the nutrition of  society.
As quite similar criteria shall be fulfilled by working fluids (refrigerants) applied to heat pumps, refrigeration and ORC cycles, several working fluids are applied by all these technologies. Ammonia was one of the first refrigerants. Refrigeration can be defined as "The science of providing and maintaining temperature below that of surrounding atmosphere". It means continuous extraction of heat from a body whose temperature is already below the temperature of its surroundings.