The Importance Of Refrigeration Technology History Essay

The Importance Of Refrigeration Technology History Essay 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 le ss 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. The table below shows the milestones achieved in the refrigeration technology. Milestones: BC 1000 The Chinese cut and stored ice 500  Ã‚   Egyptians and Indians made ice on cold nights by setting water out in earthenware pots AD 1700 In England, servants collected ice in the winter and put it into icehouses for use in the summer 1720 Dr. William Cullen, a Scotsman, studied the evaporation of liquids in a vacuum 1805 Oliver Evans of Pennsylvania, compressed ether machine, the machine is never built 1820 Michael Faraday, a Londoner, liquefied ammonia to cause cooling 1834 Jacob Perkins, ether vapor compression cycle, Ice Making Machine 1844 James Harrison of Australia invents compressed ether machine 1850 Edmond Carre of France, invents an absorption process machine 1852 William Thomson James Prescott cooling increases in proportion to the pressure difference 1855 Dr. John Gorrie builds compression refrigeration system based on Faradays experiments. 1856 James Harrison commissioned by a brewery to build a machine that cooled beer. 1859 Ferdinand Carre of France, developed the first ammonia/water refrigeration machine 1871 Carl von Linde of Germany published an essay on improved refrigeration techniques 1873 Carl von Linde first practical and portable compressor refrigeration machine was built in Munich 1874 Raoul Pictet of Switzerland, a compressor system using sulfur dioxide instead of ammonia 1876 Carl von Linde, early models he used methyl ether, but changed to an ammonia cycle 1878 von Linde starts Lindes Eismaschinen AG, (Society for Lindes Ice Machines), now Linde AG 1881 Edmund J. Copeland and Arnold H. Gross start Leonard Refrigerator Company 1894 Linde developed a new method (Linde technique) for the liquefaction of large quantities of air. 1894 Linde AG installs refrigerator at the Guinness brewery in Dublin, Ireland 1895 Carl von Linde produced large amounts of liquid air using the Thomson-Joule effect 1901 Patent # 665,814 issued January 10, for a Refridgeator (Ice Box) invented by Henry Trost. 1911 General Electric company unveiled a refrigerator invented by a French monk. Abbe Audiffren 1913 Fred W. Wolf Jr.of the Domelre Company (DOMestic Electric Refrigerator) 1914 Leonard Refrigerator Company renamed Electro-Automatic Refrigerating Company 1915 Alfred Mellowes starts Guardian Frigerato to build first self-container refrigerator for home use 1916 Servel models compressors were generally driven by motors located in the basement 1916 Henry Joy of Packard Motor Car Co. purchased the Fred W. Wolf refrigerator rights 1918 Guardian Frigerato purchased by General Motors and renamed Frigidaire 1918 Electro-Automatic Refrigerating Company renamed Kelvinator 1920 there were some 200 different refrigerator models on the market. 1922 Baltzar von Platen and Carl Munters introduce absorption process refrigerator 1923 Kelvinator held 80 percent of the market for electric refrigerators 1923 AB Arctic.begins production of refrigerators based on Platen-Munters invention 1925 Electrolux purchases AB Arctic and launches the D-fridge on the world market 1925 Steel and porcelain cabinets began appearing in the mid-20s 1927 first refrigerator to see widespread use was the General Electric Monitor-Top refrigerator. 1930 first built-in refrigerator is launched by Electrolux 1931 Dupont produced commercial quantities of R-12, trademarked as Freon 1931 the first air-cooled refrigerator introduced by Electrolux 1932 Gibson, then owned by Frank Gibson, manufactured its own line of refrigerators. 1934 an innovation, the Shelvador refrigerator, was introduced by the Crosley Radio Corporation 1936 Albert Henne synthesizes refrigerant R-134a 1937 more than 2 million Americans owned refrigerators. 1939 refrigerator with one section for frozen food and a second for chilled food, introduced by G. E. 1946 Mass production of modern refrigerators didnt get started until after World War II. 1947 GE two-door refrigerator-freezer combination 1955 80% of American homes now have refrigerators 2005 A domestic refrigerator is present in 99.5% of American homes   Table 1. Source: The Great Idea Finder 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 alkylations of butanes and butane is done at low temperatures (Noor, 2009) 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 preserver corpses in morgues. 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 produ cts (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 me4at, 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, 1998). 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. Abstract Refrigeration can be said to the process of heat removal from substances. It is done with the aim of lowering the temperature of the substance and maintaining that low temperature. Refrigeration in food is done to reduce the risk of bacteria survival. Bacteria are responsible for most of the illnesses. The technology of refrigeration can be said to have started a long time ago. Its evolution is still continuing as we seek to find the best refrigerant that can be safe to us and to our environment. Refrigeration has been associated with a lot of benefits in our homes and in the society at large. Many homes in the United States are now equipped with a refrigerator. Important words used :refrigerator, fridge, fridgerator, refrigeration, Carl Linde, Carl von Linde, William Cullen, Oliver Evans, Fred Wolf, Linde, William Thomson, Lord Kelvin, James Prescott Joule,   invention, history, inventor of, history of, who invented, invention of, CFC, HCFC, ODS,AC, HAVC.

A Pair of Tickets †Short Analysis Essay

Who am I? Have you ever sat and thought about the contributing elements that make you the person you are? In â€Å"A Pair of Tickets,† in hopes of finding her true self, June May struggles to identify who she is. Amy Tan is an author who uses the element of character development to bring out the theme of self-awareness and identity in this story, mainly focusing on the main character having the dual identity of being Chinese American. While June May discovers her ancestral home, she also finds a part of herself. June May’s mother was an immigrant from China. At the beginning of the story, June tells of how her mother tries to convey their family’s history and legacy to her. June, who is fully americanized and almost completely ignorant of their heritage, tells of how at the age of fifteen she believes she is no more Chinese than her Caucasian friends even though her mother was persistent in convincing her that being Chinese could not be helped. Her pass port reveals her American name which is June May but she chooses to introduce herself as Jing-Mei, which is her Chinese name. This incident is the start of her accepting her Chinese heritage. She has many misconceptions throughout the story; most about what is to be Chinese and the culture of China and the people that reside there. One example being she did not think that â€Å"communist China† would have such luxurious hotels, which is an example of American stereotyping. She compares her height to those of the people she is surrounded by when she gets off the train to head to customs, saying that she was much taller. She was expecting a traditional Chinese meal but her family opted for the hamburgers, fries, and apple pie instead. She was shocked when her younger cousin Lili posed as if she was a supermodel while taking a picture. June started to take in how American culture had shaped her way of thinking and that she was wrong in believing her family would be more different from her. Often looking on the experiences of your families past is sometimes needed to discover who we are as a person. Going to China helps June understand how she is Chinese. As she learns more about her family and her mother’s life and the sacrifices she had to make, June’s mindset changes more. She compares being Chinese to transforming into a werewolf as though it was something she would have to become. By the end of the story, she realizes that the part of her that is Chinese is her family, and it is in her blood. Becoming Chinese was not realistic and her mother was right. She was already Chinese, and it could not be helped. June May’s journey was never about becoming Chinese, or understanding the culture, it was about understanding who she is and knowing that there are parts of herself that she had no control of their existence. Finding her ethnic and cultural roots while in China allowed June May Woo to discover Jing-Mei Woo.

Motif of Eyes in the Great Gatsby

Taylor Hultquist Mr. Sudak English 11 18 March 2013 The motif of eyes in The Great Gatsby Eyes are the gateway to the soul, or so the old saying goes. People’s eyes can convey their feelings – their anger, excitement, or worry. Eyes can also convey subconscious emotions, revealing hidden depths that might not otherwise be apparent. In The Great Gatsby we are introduced to many characters whose eyes effectively reveal their personalities. The author explores the symbolism of eyes as Nick, the narrator, observes the lives and interactions of his friends on Long Island.One of his acquaintances, Daisy, is a flighty girl, married to a retired football player. Her husband, Tom Buchanan, embodies the classic tough-white-male aura. These two and the majority of other east coast characters are eventually seen as immoral, and the author’s portrayal of their eyes foreshadowed this development. Through a complex analysis of The Great Gatsby, one can argue that eyes are used as a motif that symbolizes the â€Å"loss of virtue in America. † Through the eyes of our narrator, James Gatsby and Tom Buchanan represent the east coast American ideal.Nick considers their wealth, social status, and confidence to be the level that he strives to attain. What he does not first understand is that these qualities ultimately lead to each man’s demise. Although Tom and Gatsby had many differences, they shared the common flaw of lost virtue. When Nick reconnects with his old friends, his first impression of Tom Buchanan is that â€Å"two shining, arrogant eyes had established dominance over [Tom’s] face† (9). In this passage we witness Fitzgerald’s reference to eyes and his characterization of them with the adjective of â€Å"arrogant. These overwhelming eyes are the first feature Nick notes, and he claims even they communicate Tom’s stuck-up attitude. Tom’s eyes make him appear to be â€Å"always leaning aggressively fo rward† (9) – clearly a negative personality trait. Virtue is defined as a quality considered morally good or desirable in a person. Referencing the quote above, one can make the inference that Tom’s character falls outside of this definition. This is a trend, which carries throughout this novel continuously with all of Nick’s ‘east coast friends. During the same evening Nick notes that Daisy’s eyes â€Å"flashed around her in a defiant way, rather like Tom’s, and she laughed with thrilling scorn† (20). This quote is juxtaposed to an unflattering insight into Daisy’s character, as Nick observes in the insincerity of her comments about sophistication and the falsity of his evening spent with her and Tom. Yet despite all this, he still acknowledges that Daisy’s character always seems to be promising â€Å"gay and exciting things† have already happened and are still yet to come.Daisy represents the wild side of h igh end New York, but we see that this lifestyle is not quite as superior as everyone believes it to be. In fact, Daisy seems to view it in quite a bittersweet manner and cries that it is not entirely satisfying. What Fitzgerald is displaying through the two figures of Tom and Daisy is that while they want for nothing, they long for everything. In order to satisfy their desires they turn to money and society, and still find these lacking. Nick moved from Midwestern America to the East Coast.Cities have historically been viewed as centers of depravity, while rural areas represent simplicity and thus a kind of innocence. Every time the characters travel between the Eggs and the city, they pass beneath a billboard containing the infamous eyes of Dr. TJ Eckleburg. His eyes are â€Å"blue and gigantic† with â€Å"retinas one yard high,† all rising â€Å"above the grey land and spasms of bleak dust† below (26). These eyes are witness as the characters venture to the c ity – Tom for his affair, Daisy looking for ‘fun,’ even Gatsby to meet the man who fixed the World Series.These fraudulent actions reveal the corrupted natures of characters, and in effect the corruption of people at large. The billboard’s eyes are equated to the eyes of God, eyes witnessing everything everywhere. Just as one would feel shame knowing God was watching their deceitful actions, one should feel shame being scrutinized by TJ Eckleburg. The commercialism of the billboard is additionally reflective of the increasing commercialism of America, and of its citizens growing obsession with material wealth. Tom and Daisy’s lifestyle is the epitome of this, as they solely pursue money and fun and have no interest in their moral states of being.Yet just as this couple’s lives lack true joy – as displayed through Fitzgerald’s apt descriptions of their eyes – so will anyone’s who obsessively pursues the ‘Ameri can Dream’ of endless wealth. Works Cited Dictionary. com. â€Å"Virtue. † Dictionary. com. Dictionary. com, n. d. Web. 18 Mar. 2013. Fitzgerald, F. Scott. The Great Gatsby. Australia: Scribner, 1925. E-book. â€Å"The Great Gatsby; Symbols and Motifs. † Eyes of T. J. Eckleburg. Blog Spot, May 2011. Web. 20 Mar. 2013. â€Å"Benjamin Franklin Quotes. † LibertyQuotes. Liberty-Tree. ca, 2005. Web. 20 Mar. 2013.

The Criminal Justice System Is Not Perfect - 1331 Words

The criminal justice system is not perfect, although it has its rewards when justice is being served to either a victim or a suspect. A part of the criminal justice policy I will analyze sentencing for psychopaths and juveniles. Should psychopaths plead insanity for their irresponsible actions. Should the judicial system keep juveniles in prison or let them out due to their age? Are juveniles irresponsible in a result of that they know not what they do? According to the 8th amendment, it states, Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted. A lot of states seem to have their way of doing things in finding ways how they can impose cruel and unusual punishment. Psychopaths are among us, and they’re growing vastly in many communities. Should we accuse mental cases of their unsafe activities? A significant part of the late open deliberation over this inquiry has concerned the limits of mental cases, and specifically, whether they are fit for learning. A few scholars have contended that mental cases deficiencies in sympathy cause them to experience issues with the securing of good ideas. These challenges in this way involve that they need good obligation about their activities. An article I read â€Å"The campaign for the fear sentencing of youth†, states that more than 25 percent of people is serving life without parole. After being sentenced as children were convicted of felony murder or accompliceShow MoreRelatedThe Criminal Justice System Is Not A Perfect System Essay2359 Words   |  10 Pages â€Å"Innocent until proven guilty.† The entire basis of the criminal justice system is to prosecute those who commit crimes and to validate every piece of evidence before prosecuting a suspect. 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