Refrigeration Technology
Important words used refrigerator, refrigeration, Carl Linde, William Cullen, Oliver Evans, deterministic technology, socially constructed technology.
James Prescott Joule, history of refrigeration, methyl chloride, Freon, The Regulatory Clean Air Act ,CFC, HCFC, ODS, AC, HAVC.
Refrigeration Technology
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).
Historical roots behind refrigeration.
The very first artificial refrigeration known was the demonstration presented by William Cullen at the University of Glasgow 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 compression cycle of vapor. John Gorrie built a refrigerator in 1844 based on Evans design. He was an American physician.
This refrigerator was built with the aim of cooling 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 (Williams, 19)
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, 25)
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, 7). 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 alkylations of butanes and butane is done at low temperatures (Noor).
Refrigeration is therefore a vital technology in many sectors of the economy like the dairy industry, the meat industry, fish and pork industry and also in the fruits and vegetables sector. In the non food sectors, refrigeration is used in school laboratories to store chemicals, samples and cultures. It is also the technology that is used to preserve corpses in morgues. The main reason why refrigerators became popular is because other types of food preservation methods altered the foods whereas refrigeration did not alter the taste nor deplete the vital nutrients (Shepard, 227).
Detrimental effects of refrigeration to the society.
The refrigerant used in refrigerators has a negative effect on the environment. Though the use of CFC has been banned, some manufactures may sell the old stocks of refrigerators which use CFC. These are detrimental to the ozone layer. The HFCs being used on modern refrigerators are strong green house gas emitters. Though they do not harm the ozone, they destroy the environment that we live-in. Refrigeration contributes to the global warming. Though HFCs were seen as the solution to refrigeration, it has a very high potential of global warming. This contribution is due to direct emissions of the refrigerant gases. Most of these emissions are due to leakage of the refrigerant into the environment either due to poor maintenance and containment. Freon was seen as been safer to the consumer though it had negative impacts on the environment. Clean Air Act was passed in 1990 and it restricted use of CFCs. Many industries had no other choice than to be forced to phase out CFCs in their products (Gopalnarayanan, 19)
Refrigeration as a symbol of growth.
Refrigeration has allowed many families and industries to keep food fresh for long periods of time. It is a symbol of growth in that most families are small and they occupy a small piece of land and hence there is no space for keeping livestock and growing different varieties of fruits and vegetables. Also most modern families live in towns and cities where there are no gardens for growing fruits and vegetables or keeping animals. This does not therefore mean that because these families are limited by these factors, they cannot enjoy a varied and balanced diet. Supermarkets have stocked all types of meat, eggs, vegetables and eggs in their refrigerated shelves. These customers come and buy the same and stock it in their refrigerators. The fish, poultry, dairy products and vegetables can be kept in the same space of the refrigerator within the kitchen.
Refrigeration is an important symbol of growth and societal progress in that the society can enjoy a variety of salads, fruits and vegetables all year long without having and tilling their own garden. The society can also enjoy dairy products without having their own dairy animals, meat products without owning beef cattle, egg products without rearing their own poultry and all kinds of fish without having a fish pond all year round. Also other types of foods from far off countries are madder available to the society. These food products are shipped or delivered by air under refrigeration.
Refrigeration allows purchase of goods in large scale and in bulk. With regard to economies of scale, this saves on money. It has become possible to enjoy ice cream which may have been produced from abroad unlike in the past where ice cream was eaten on the spot at the place of manufacture. Through refrigeration world trade has been opened up and refrigerated goods from one country can be easily market in another without the fear of spoilage.
Refrigeration technology has acted as a source of employment to many people. The direct employees include the refrigeration experts, technicians mechanics and installers. These are mainly people employed by air conditioning, plumbing and heating contractors and companies. Indirect employment involve people in other sectors e.g. in shops that sell the refrigeration equipments, dairy farmers, fishermen and fruits and vegetable farmers.
How government institutions helped shape refrigeration.
Government as a regulator- the government through the Environmental Protection Agency has set standards for monitoring and regulating refrigerant leaks. There are other regulations and strict standards that have been set by the government regarding green house emissions from the refrigerants. The government has identified CFCs, HCFCs, and PFCs as ozone depleting gases (ODS) and also global warming gases and has therefore prohibited their use as refrigerants. These are the gases commonly used for HVAC and in AC units. Many US states have increased the demand for a detailed refrigerant reporting requirement (Stouffer).
Government as consumer- many government buildings, both central and federal government, is installed with air conditioners, refrigerators and other heating and cooling systems that use the refrigeration technology. Also government hospitals and other governmental organizations are installed with refrigeration systems. This is evident that the government is a major consumer of the refrigeration technology.
Is refrigeration an example of deterministic technology or socially constructed technology.
In my opinion, refrigeration is a socially constructed technology. Refrigeration does not determine the human actions but rather it is the human actions that have shaped refrigeration. The need for fresh products has resulted into the invention of the refrigeration technology. Human beings actions are such that they are very busy either in work places or in school and hence have no time to cook fresh foods every day. This has led to the development of the refrigeration technology. With its development, the human beings are now able to cook more food whenever they are free which they can refrigerate and eat them for a long period of time.
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