Refrigeration Technology

By Author: Henry Ford
Total Articles: 189
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The refrigeration technology is an important technology in that it slows down the growth of bacteria. In doing this, it lowers the risks of diseases. This is because bacteria exist all around us including in the foods that we eat. When the bacteria are supplied with enough nutrients and favorable climatic conditions, they grow rapidly and hence can cause illnesses. Refrigeration technology comes in hardy to stop the rapid multiplication of the bacteria and this is a benefit to the society in that its chances of falling ill from Bacteria illnesses are reduced (Bauer, 1998).

Historical roots behind refrigeration.
The very first artificial refrigeration known was the demonstration presented at the University of Glasgow by William Cullen in 1748. This discovery however was not use for any practical purpose. The first refrigerator was designed by Oliver Evans, an American inventor in 1748. But the first practical refrigerator was built in 1834 by Jacob Perkins. This refrigerator used vapor in a vapor compression cycle. John Gorrie an American physician built a refrigerator in 1844 based on Evans design. This refrigerator ...
... was built with the aim of making ice to cool the air for the yellow fever patients that he was treating. Carl Von Linden, a German engineer patented, in 1976 the process of liquefying gas but not the refrigerator (Burstall, 65). Gas liquefaction is the basic part of refrigeration technology. The first refrigerators were made of wood cabinet and a compressor that was cooled with water. Steel and porcelain cabinets emerged in 1920s to replace the wooden refrigerators which were less effective. The evolutions of the refrigerators continue to improve in the 50s and 60s and they became better to suit the needs of the customers. Automatic ice makers and automatic defrost were added in the refrigerator with the aim of making them user friendly and reduce the maintenance. The modern day refrigeration technology is aimed at making the refrigerators more environments friendly (About.Com). The refrigeration process has not stopped evolving. The early refrigerators of 1800 used toxic gas like ammonia, methyl chloride and sulfur dioxide as the refrigerant. These were used up to 1929. In the 1920s, there are many fatal accidents which occurred. This was caused by the leaking of methyl chloride from the refrigerators. It was after this that 3 American corporations embarked on intensive research to come up with a less dangerous method of refrigeration. Their efforts led to the use of Freon which became a standard for all refrigerators. Freon was changed in 1996 and it was replaced with HFC 134a. This was done so as to comply with The Regulatory Clean Air Act. The replacement was done because HFC 134a was less injurious to the environment and the Ozone as compared to Freon. The effectiveness of HFC 134a was just the same as Freon and the users of refrigerators did not notice any difference.

Use of ice
The Chinese started cutting and storing ice in 1000 BC. Ice was made by setting of water during cold nights in earthenware pots in Egypt and India around 500 BC. In England, ice was collected by servants in winter to be used in summer in 1700 AD.

Other evolutions of refrigeration technology not mentioned above include: liquefaction of ammonia to cause cooling by Faraday in 1820, invention of compressor by James Harrison, an Australian in 1834, invention of an absorption processing machine by Edmond Carre of France in 1850, invention of a compressor system that used sulfur dioxide instead of ammonia by Raoul Pictet of Switzerland in 1874, installation of a refrigerator by Linde AG at the Guinness brewery in Dublin, Ireland, unveiling of a refrigerator by the General Electric Company in 1911 which had been invented by Abbe Audiffren, a French Monk, the General Electric “Monitor Top” refrigerator becomes the most widely used refrigerator in 1927, synthesis of refrigerant R-134 by Albert Henne in 1936, introduction of a refrigerator containing a section of frozen foods and another for chilled foods by General Electric in 1939, mass production of modern refrigerator in 1946 and the invention of a two door refrigerator by General electric in 1947. by 1955, 80% of the Americans homes owned a refrigerator and by the year 2005, 99.5% of all the Americans homes owned a domestic refrigerator (The Great Idea Finder). There are many events that contributed to the modern day technology of refrigeration and some of them have not been listed above. Also the refrigeration technology is under more research to ensure that it is safe for us to use and also that it does not impact negatively on the environment. With this regard, most of the research is being concentrated on the best refrigerant to use.

Is refrigeration an old or a new technology.
Refrigeration is an old technology that started a long time ago. Refrigeration concept can be said to originate from the prehistoric times. During this period, man found that the meat he had hunted lasted longer when stored in the cool areas of the cave or when packed in snow. The early man found that when he stored his game in cold temperatures, it lasted for long. He therefore hunted excess game which he kept in cold temperatures and he would eat this meat when the food was in short supply. As the early man progressed, he started using ice which he harvested in winter to use in summer. Ice was also harvested from lakes and rivers to be used for the purpose of refrigeration.
Adding chemicals like sodium and potassium nitrate to water so as to lower its temperatures was the next stage in the history of refrigeration. It is recorded that this method was used to cool wine in 1550. The use of mechanical refrigeration started in the last quarter of the 19th century. This evolution was a long slow process (Trevor, 1978)

Has refrigeration led to any type of social change?
The refrigeration technology can be said to have a great impact to women in particular. This is because women are viewed as the domestic worker (Cowan, 137-138). Though this mentality has changed in the modern world, there is still the thought that the domestic world belongs to women. The refrigerators can be seen to symbolize the freedom of house wives. They have saved women from preserving foods in the old fashioned ways of salting, smoking or dehydrating. The air conditioning has contributed immensely to the development of the hot and humid areas both socially and economically. This has been achieved through creation of habitable environments with desired temperatures and humidity levels in office buildings and private homes (Barbara, 2003)

Benefits of refrigeration to the society
Refrigeration has changed the lifestyles of the society in various ways. One can buy food for a whole week without fear of it getting spoiled after refrigeration. Cooked food can also be stored for long without getting spoilt. Salting of food as a method of preservation is long forgotten. The food preserved using this method did not even last for a long time. One can also get a cold drink during the hottest summer and this seemed like a dream before refrigeration wad invented. Fruits, vegetables and even flowers can be kept fresh for a long period of time with refrigeration. The modern life is in the fast lane. This has called for most people to be working for long hours or working two jobs. In homes both partners may be busy for up to a whole week and hence no time for everyday cooking. With refrigeration, they can cook as much food as possible when they are free and storing it in refrigerators and they can eat it throughout the week. This saves them much time which could have been wasted ion cooking after work. With refrigeration, the temperature of the food is lowered and thus the food can be kept for long to be used later without getting spoiled (Shephard, 29). Refrigeration is also widely used for the purposes of air conditioning in homes, public buildings and restaurants. It is also used for refrigeration of foodstuffs in restaurants and also in large storage warehouses. Refrigerators have become very common in the United States. Most American homes started using refrigerators a long time ago. More than 80 % of the rural American and more than 90% of urban American homes used owned a refrigerator by the year 1950 (Historychannel.com). Refrigeration is also used commercially and in manufacturing industries. It is used to liquefy gases including oxygen, nitrogen, propane, and methane. It is used to compress and condense water vapor in compressed air purification. This process is aimed at reducing the moisture content of compressed air. In industries like petrochemical, refineries and chemical plants, refrigeration is important as it is used for the maintenance of certain chemical processes and reactions at low temperatures. An example is in the production of high octane gasoline component where the alkylation’s of butanes and butane is done at low temperatures (Noor, 2009)

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