History Of Car Cooling System Engineering Essay

History Of Car Cooling System Engineering Essay In the earlier days, automobile compartments were first heated,ventilated and cooled by the obvious and primitive solutions.Ventilation was simple to arrange by opening car windows.However,the air entering was as hot,cold or dusty as the air outside,and so under poor conditions they were often kept closed. When the weather is cold, clay bricks were easy to warm up on to of a cast-iron stove, and could be placed in a box on the floorboards to provide heat as long as they remained warm.A more sophisticated approach was to purchase a small heater that burned coal or charcoal to warm the passenger compartment continuously. When the weather turned hot,most drivers simply put up with the discomfort,but more innovative travellers sometimes attempted to cool the passenger compartment by bringing along a block of ice.Neither solution was especially effective or convenient, and manufacturers soon discovered mechanism for automobile conditioning system.The first prototype was attributed by Karl Benz. Wilhelm Maybach designed the first honeycomb radiator for the Mercedes 35hp which was the very first successful vehicle with a cooling system. In 1941, 300 Cadilacs were manufactured with an air conditioning system.Chrysler also produces some of the cars that year with air-conditioning system.In 1948 the Automotive Refrigerated Air Conditioning(ARA) Company was first to offer aftermarket automotive air-conditioning systems.By the mid-1950s there were more than fifteen companies offering air-conditioning system in kit form. Latest Technology Automotive engines use the cooling system to achieve and maintain an optimum operating temperature range.An engine gives off enough heat to seize,melt and ignite it components.To prevent this type of severe heat damage, coolant is circulated through passages in the engine block and cylinede head,drawing away excess heat.Coolant is also part of the heating system.The heat absorbed by the coolant is used to warm the passenger compartment. The Cooling System concists of the following components:- I. Water pump II. Thermostat III. Radiator IV. Coolant recovery tank V. Engine fan(s) VI. Hoses VII. Core plugs VIII. Heater Core Water pump http://www.aa1car.com/library/water_pump_cutaway.jpg -On rear-wheel-drive vehicles,the water pup is located between the engine block and engine fan.On a few front-wheel-drive vehicles,the water pump is located at the rear of the engine.The water pump, uses centrifugal force to circulate the coolant,and consists of a fan shaped impeller set in a round chamber with curved inlet and outlet passages.The chamber is called a scroll because of the curved areas.The centrifugal design causes vehicles increase engine speed when the coolant temperature begin to rise. Thermostat -Any liquid-cooled car engine has a small device called the thermostat that sits between the engineand the radiator. The thermostat in most cars is about 2 inches (5 cm) in diameter. Its job is to block the flow of coolant to the radiator until the engine has warmed up. When the engine is cold, no coolant flows through the engine. Once the engine reaches its operating temperature (generally about 200 degrees F, 95 degrees C), the thermostat opens. By letting the engine warm up as quickly as possible, the thermostat reduces engine wear, deposits and emissions. As it heats up, its valve opens about an inch, apparently by magic! If youd like to try this yourself, go to a car parts store and buy one for a couple of bucks. http://www.2carpros.com/images/articles/engine/cooling/thermostat/engine_therrmostat.jpg The secret of the thermostat lies in the small cylinder located on the engine-side of the device. This cylinder is filled with a wax that begins to melt at perhaps 180 degrees F (different thermostats open at different temperatures, but 180 F/82 C is a common temperature). 1.Thermostat Failure The thermostat is pretty simple and rarely causes problems, but when it fails the results can be disastrous. The worst case scenario is when the thermostat sticks shut, which can happen if the wax element has been damaged by previous overheating, corrosion or age. If it sticks shut, it will block the circulation of coolant between the engine and radiator causing the engine to overheat. If the thermostat fails to close, which can happen if the sensing element binds up, the return spring breaks or a piece of rust or debris jams it open, the constant flow of coolant through the thermostat will prevent the engine from reaching normal operating temperature. This can cause poor driveability in cold weather, a sharp increase in fuel consumption, little or no heater output, and accelerated blowby and ring and cylinder wear. 2.Thermostat Checks To check the thermostat, remove the radiator cap and start the engine while it is cold. Looking inside the radiator, you should see no movement of coolant. If you see movement, the thermostat is stuck open or is missing and repairs are required. After the engine has run for five minutes or so, the upper radiator hose should start to feel hot signaling that the thermostat has opened and the coolant is now circulating through the system. Inside the radiator, you should also see coolant movement. If there is no movement (and the engine starts to overheat), the thermostat is defective and needs to be replaced. A suspicious thermostat can also be tested by removing it from the engine and dropping it into a bucket of near boiling water. It should be closed when cold, then open once it hits the hot water, then close again after its been removed and allowed to cool. You can use a thermometer to check the exact opening and closing temperature. Radiator -A radiator is a type of heat exchanger. It is designed to transfer heat from the hot coolant that flows through it to the air blown through it by the fan. http://upload.wikimedia.org/wikipedia/commons/thumb/a/ad/Automobile_radiator.jpg/220px-Automobile_radiator.jpg Most modern cars use aluminium radiators. These radiators are made by brazing thin aluminium fins to flattened aluminium tubes. The coolant flows from the inlet to the outlet through many tubes mounted in a parallel arrangement. The fins conduct the heat from the tubes and transfer it to the air flowing through the radiator. The tubes sometimes have a type of fin inserted into them called a turbulator, which increases the turbulence of the fluid flowing through the tubes. If the fluid flowed very smoothly through the tubes, only the fluid actually touching the tubes would be cooled directly. The amount of heat transferred to the tubes from the fluid running through them depends on the difference in temperature between the tube and the fluid touching it. So if the fluid that is in contact with the tube cools down quickly, less heat will be transferred. By creating turbulence inside the tube, all of the fluid mixes together, keeping the temperature of the fluid touching the tubes up so that more heat can be extracted, and all of the fluid inside the tube is used effectively. Radiators usually have a tank on each side, and inside the tank is a transmission cooler. In the picture above, you can see the inlet and outlet where the oil from the transmission enters the cooler. The transmission cooler is like a radiator within a radiator, except instead of exchanging heat with the air, the oil exchanges heat with the coolant in the radiator. Coolant Recovery Tank- -The coolant recovery tank, also called an overflow reservoir, is a tank that allows the coolant to expand without being forced out of the radiator. The tank can also ensure that the radiator is always full as it allows the radiator to be refilled as the engine cools. 1.Heating Up As the engine heats up, the coolant expands as its temperature increases. The increase in heat is accompanied by an increase in pressure. The radiator pressure cap, which uses a spring to maintain a seal on the radiator fill hole. Once the pressure reaches around 15 psi, the force of the spring is overcome, and the cap rises. As the cap rises, the opening of a tube is exposed. The coolant under pressure is forced through the tube into the recovery tank. 2.Cooling Down As the engine cools, the process works in reverse. Instead of pressure forcing coolant out of the radiator, a vacuum draws it back in. This keeps the coolant at the proper level throughout various engine temperatures. 3.Measuring Coolant Level The coolant level can be measured by a dipstick in the recovery tank. The dipstick has a range of hot and cold. The coolant level should be at the cold mark when the engine is cold, and hot when the engine has reached running temperature. 4.Boiling Over In the event that too much coolant is in the system, the recovery tank itself has a pressure cap that will allow the excess coolant to exit the vehicle. If the pressure builds too much inside the radiator and recovery tank, the expanding coolant will force the cap open enough for the excess pressure to be relieved. The use of an overflow tank is done for environmental reasons. It prevents a slightly overfilled radiator system from venting onto the ground. The use of an expansion tank, with a conventional radiator, adds a very small amount of additional coolant to the system. If this small amount of additional coolant is sufficient to correct an overheating engine, there is some other form of cooling system problem, which should be addressed. Cooling Fan -The cooling fan is only needed when engine temperature rises above a predetermined level or when there is an increased load placed on the cooling system (as when running your air conditioner). The rest of the time, running the fan would be a waste of electrical energy so it is turned off. Electric cooling fans are found on most front-wheel drive vehicles with transverse mounted engines as well as many late model rear-wheel drive vehicles. Electric fans are used on FWD cars because the fan doesnt require a belt drive and can be mounted independent of the engines location. Whats more, electric fans require less power to operate (for improved fuel economy and performance), theyre quieter, and they allow more precise control over cooling. By comparison, a mechanical belt-driven fan can require anywhere from 5 to 15 horsepower depending on engine speed and the size of the fan. Even with a fan clutch to reduce the drag at higher speeds, its still a lot of wasted power. 1.Fan Operation At highway speeds, there is usually enough airflow through the radiator that a fan isnt needed. So the fan usually only operates when the vehicle is sitting in traffic or driving at slower speeds. On older applications, the electric fan is controlled by a temperature switch located in the radiator or engine. When the temperature of the coolant exceeds the switchs rating (typically 195 to 235 degrees F), the switch closes and energizes a relay that supplies voltage to run the fan. The fan then continues to run until the coolant temperature drops back below the opening point of the switch. Most electric fans are also wired to come on when the A/C is on. Many vehicles also have a separate fan for the A/C condenser (dual fan systems). One or both fans come on when the A/C is on. In newer vehicles with computerized engine controls, fan operation is regulated by the engine control module. Input from the coolant sensor, and in many cases the vehicle speed sensor too, is used to determine when the fan needs to be on. CAUTION: Many electric fans are wired to come on anytime the engine is above a certain temperature, regardless of whether the engine is running or not. This means the fan may come on after the engine has been shut off. So keep your fingers away from the fan at all times unless the battery or fan motor wires have been disconnected. 2.Checking The Fan Four things can prevent a fan from coming on when it should: a bad temperature switch or coolant sensor (or problem in the switch or sensor wiring circuit); a bad fan relay; a wiring a problem (blown fuse, loose or corroded connector, shorts, opens, etc.); or a failure of the fan motor itself. Only the latter would require replacing the fan motor. One way to check the operation of the fan motor is to jump it directly to the battery. If it spins, the motor is good, and the problem is elsewhere in the wiring or control circuit. Another check is to test for voltage with a voltmeter or test light at the fans wiring connector. There should be voltage when the engine is hot and when the A/C is on. Hoses -Radiator hoses must be the correct size,material,and be kept in good repair.The upper and lower radiator hoses must be large enough to handle the maximum flow of coolant when the thermostat is fully open.The smaller heater hoses divert a portion of the coolant to and from the heater core.Additionally,the hoses must be of the specified type of material for high pressure,high temperature systems.Always inspect the hoses for any sign of damage when you service a cooling system.The rubber material of hoses becomes brittle and cracked form the severe heat of engine compartment. Core Plugs -Core plugs seal the holes used during the manufacturing process.The plugs are round discs of sheet metal pressed into openings on the side of the engine block that lead directly into the water jackets.These plugs may leak or pop out if the morning cooling system freezes or is not properly maintained.Core plugs tned to pop out if the block freezes.Originally it was thought that these plugs were designed for this reason,to lessen the pressure on the block and prevent it from cracking,which is why they are sometimes(incorrectly) referred as to freezed plugs. Heater core -You may not normally think of the heater core as part of the cooling system,as we generally consider the heater core as a compartment of the heating system.However, the heater core is directlyconnected to the cooling system by the heater hoses.A heater core failure can lead to other cooling system malfunctions. The heater core is a heat exchanger, and is constructed much like a radiator.It is mounted inside a housing assembly and is located either on the engine compartment cowl panel.As warmend coolant circulates through the heater core,the heater core fins absorbs heat.At the same time,a blower motor blows air across the heated core fins.The air absorbs the heat from the fins and the warm air is vented into the passenger compartment. Findings -Respondent 1,2,3

History of Psycology Essay

Before psychology there was philosophy. Descartes was around during the end of the Renaissance and in the era of revolutionary developments in science. Born in 1596 to a French lawyer, Descartes could understand more than most. When he was in his late 20’s, he resembled more of a scientist than a philosopher since he had studied physics, optics, geometry as well as physiology. The first to discover that lenses in one’s eyes are inverted by removing an ox’s eye, Descartes also believed in truth and was an active rationalist, meaning he believed the truth would emerge by careful use of reason and it became his modus operandi. This way to truth was also through the human capacity to reason. He created four rules he used to arrive at truth. He also was the best-known example of a dualist, giving way to accepting a clear partition between mind or soul and body. He believed that the body was like a well-oiled machine and the mind could have a direct influence on it. John Locke followed Descartes in 1632. He wanted to take epistemology, the study of human knowledge and obtaining it, to a more experimental based group of discipline. Locke spurned the idea of innate ideas, only â€Å"faculties†. Some ideas appeared so early in life that they used to believe they were innate but Locke declared that all of our knowledge was derived from experiences. Locke stated that the mind was like a white sheet of paper, blank but able to become something great. Experiences add to the paper by sensations and reflections. George Berkeley was another philosopher born in 1685. His work on vision was the first example of how empiricist thinking could be applied to the study of perception. Lastly there is David Hume. He built his knowledge around the base premise that all of our understanding is rooted in experience, or impressions vs.ideas. Impressions are basic sensations experienced daily such as feeling pain, seeing yellow or tasting saltiness. Ideas are faint copies of impressions but are not as vivid. Hume also offered three laws of association: resemblance, contiguity, and cause/effect. Resemblance meaning the look of one object can bring back memories or ideas of another item. Contiguity means intertwining two things together such as the smell of oranges and the west coast. The greatest of the laws is the law of cause/effect. If one idea causes another idea or memory, the cause reminds you of the effect i.e. burning your hand on the stove while making muffins. When seeing the scar, the memory of muffins will reappear. Hume also suggested that to conclude that A causes B, one must know 1. When A occurs, B must occur regularly, 2. A occurs before B, and 3. B doesn’t occur without being preceded by A. In the 19th century, psychology shifted from being philosophically based to being more scientific. Scientists and physiologists tried to show the world the reasons behind psychology were in fact based on the senses and the nervous system. One example is the Bell-Magendie law. Both Sir Charles Bell and Francois Magendie both were studying the roots of the postierior and anterior roots of the spinal cord and their functions. Bell was credited with the law because his research was published earlier, though limited, and Bell did not conduct an experiment like Magendie did on puppies. They discovered that the posterior roots control sensation where there is movement still but no sensation. Magendie then severed the anterior root in another animal and the limb was flaccid and unable to move though it still had sensation. To conclude, the science of psychology has always been a changing domain from philosophy to the sciences. It will continue to grow and develop as the world changes and shifts. Descartes started the ball rolling by studying optics and how to arrive at the truth with his four laws. Locke showed the world that it is nurture vs. nature that shapes a person. Hume gave us the three laws of association. In the 19th century psychology developed to include sciences. All of these philosophers and scientists shaped the psychology field to what it is today.

Globalization And Its Impact On Modern Society - 1242 Words

Since the early 1990’s, the term globalization has become a bit of a buzzword, prevalent in the speech of policy makers, popular press, and academic journals. It is used frequently to describe the †¦. . Its consistent use has led many people to a certain understanding of it most basic meaning, but it is an immensely complex concept that can not be truly understood at the top layer of meaning which is prevalent among general society. There are multiple varying definitions for the globalization phenomenon. Many people argue that the process of globalization has contributed to a metaphorical â€Å"flattening† of our world, destroying absolute spatial differentiation. The hyperglobalist economists believe that we have come to live in a ‘global village’ society in which is close to the destruction of spatial differentiation and thus, the study of geography. The idea is that our differences are declining and our culture is homogenizing. However, this belief relies on the assumption that modern globalization mechanisms can be considered completely global. It is difficult to refute the argument that there are currently millions of people who have not seen or been affected by even the most fundamental advancements and compression that go along with globalization. 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Marshall McLuhan, a technological determinist, says in his book ‘Medium is the massage’ that the most widespread modern media influence how humans think, act and perceive the world around them. He states that the medium significantly influences the message that people will receive, and thus, the same message is perceived by the same individual in several ways if he receives them in a different way. The expression the medium is the message means that recipient receives messagesRead MoreThe Reasons For Anti Globalization Protests1263 Words   |  6 Pagesto Al-Rodhan, Globalization is defined as the process of integration across the whole world uprising from the interchange of values and ideas of different aspects including political, economical, social, environmental and cultural aspects. Advancements in technology made the process of globalization go further in recent decades. It favors people to communicate, travel and exchange the ideas. However, a coin has two sides . 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While globalization has positive effects, it also is important to understand the impact it has across the world. â€Å"This process has effects on the environment, on culture, on political systems, on economic development and prosperity, and on human physical well-being in societies around the world† (What Is Globalization?). Globalization allows the free trade of products

William Shakespeare s Othello - 957 Words

all the characters presented in Shakespeare s literature the most sinister one is without a doubt Iago. He is a ruthless sociopath. No other character can even come close to his evil. Most of the antagonists present in Shakespeare s plays have valid reasons for the troubles the cause. Iago doesn t for the most part he just has a burning hatred for the world especially Othello. Iago is the whole reason there is any conflict in Othello . If he never had entered the play Othello would have married Desdimonia and they would have lived happily ever after. Right from the beginning of the play to the very end he causes conflicts. He is directly or indirectly responsible for the deaths of: Othello Desdimona, Emilia, Cassio, and Roderigo. Which happen to be all of the main characters. I believe Shakespeare didn t just want Iago s character to be evil. I think he wanted him more to symbolize it. All of the problems he causes are through lies, treachery, manipulation, and a deep unknown hate. Some of his hate is fueled by jealousy and revenge. The ironic part is that he wants to be known as honest Iago. Every act contains an evil plot set up by Iago. They all play into his grand scheme. In the very beginning of act 1 Iago displays his hatred for Othello. He is angry at him for making Cassio the lieutenant. Jealousy is his first motif. He than tells Roderigo (a former suitor of Desdimonia) that Othello and Desdimonia are getting married. The two of them then go and tellShow MoreRelatedOthello : William Shakespeare s Othello2542 Words   |  11 Pages3 March 2015 Othello Introduction Shakespeare is the second most quoted writer in the English language – after the various writers of the Bible. Many of Shakespeare’s ideas for the play Othello came from a collection of tales written by Giraldi Cinthio. In Othello the character of Iago acts as the prominent main character throughout the play, even though he plays the role of the antagonist to the other central characters in the comedy Iago is the tragic hero. Shakespeare’s Othello was not justRead MoreOthello By William Shakespeare s Othello Essay1230 Words   |  5 Pages Previously, in Act 3.4, Othello begins to suspect Desdemona’s loyalty, as he continuously asks Desdemona for the handkerchief, yet she keeps on changing the topic. In Act 4.1, Iago continues to convince Othello of Desdemona’s faithfulness. In Act 3.4, Othello defended Desdemona when Iago accused her; but in Act 4.1, their position is switched. Othello becomes more aware of what Iago is saying and the anger t hat he has towards Iago has significantly reduced, while he begins to doubt Desdemona.Read MoreWilliam Shakespeare s Othello And Othello1720 Words   |  7 PagesDejenara Williams Ms.Milliner EES21QH-04 January ,18,2017 In this world there are two different types of people. There are those with a fixed mindset and others with a growth mindset . Each of these mindset involve different personality and characteristics. This may create a different outlook on life, meaning different morals and actions. Which happens to come into play while reading shakespeare s Othello. Most of the characters , maybe even all fit into either categories. CharactersRead MoreOthello By William Shakespeare s Othello Essay977 Words   |  4 Pages In William Shakespeare s Othello, Iago s character is perhaps the most appalling scalawag. Oxford s Dictionary characterizes miscreant as an, an evil individual; boss insidious character in a play or a story (Oxford 740). Iago plays the antiquated of Othello, who is the general of the Venetian powers. As an old, Iago is to be an unwavering worker to Othello. In any case, Iago has developed intense and scornful and utilizes his gathered steadfastness as a wedge to bring about Othello s endRead MoreWilliam Shakespeare s Othello 1386 Words   |  6 Pagesblood-crimson of lust and the jade-green of jealously are but two of the vast palate required to paint this inescapable human passion. William Shakespeare’s store of colors is unrivaled. No human failing, foible or foolishness escapes his gentle, comedic reproof. He equally enjoins his audience to venture as bravely as he does into the palpable horror of love gone amiss. In â€Å"OTHELLO,†Ã¢â‚¬Å"MACBETH,† and many more dramas, love’s fatal potential to provoke vengeance or the quest for earthly power is powerfully feltRead MoreAnalysis Of Othello s Othello By William Shakespeare Essay2117 Words   |  9 Pages Racist Ideology As Seen In Othello As a writer, William Shakespeare possessed an uncanny ability to address topics that were, for the most part, unnoticed in society. Every one of his characters feels realistic because they are so complex and based on psychological motivations. When Shakespeare’s Othello was first written, there was undoubtedly a complicated relationship between white English citizens and so called â€Å"foreigners†. However, society’s inability to understand or accept different culturesRead MoreOthello s Othello By William Shakespeare897 Words   |  4 PagesIago’s main reason to denigrate Desdemona’s character is his love for Othello. Consequently, he will do anything to gain Othello’s admiration. When Iago is putting his plan into action and planting in Othello’s mind that Desdemona is not faithful to him, Iago says: Othello kneels .............................................................................................. IAGO: Do not rise yet. Iago kneels Witness, you ever-burning lights above, You elements that clip us round above, Witness thatRead MoreOthello s Othello By William Shakespeare848 Words   |  4 Pages Desdemona’s Passivity [In the Shakespeare’s play â€Å"Othello†] Desdemona is a passive character in the Shakespeare play â€Å"Othello†. We can identify this as a fault in Desdemona, in various acts and scenes throughout the play. A critic had stated that â€Å"Desdemona is passive, acted upon rather than acting.† This is a valid statement which is noticeable in Desdemona’s character. When Desdemona argues Cassio’s position that Othello stripped from him. We see from this that she could have actedRead MoreAnalysis of William Shakespeare ´s Othello737 Words   |  3 PagesThe Tragedy of Othello, a play by William Shakespeare, was written in the early 1600’s. If Othello was written in a different time, 21st century America, the view of people of different genders and races would differ, women would be held to a more equal social standard and the issue of Othello being black, wouldn’t be as prominent when he marries Desdemona. This play was written in a time where it was essential to follow cultural values. During this time women were expected to respect all maleRead MoreOthello By William Shakespeare s Othello1209 Words   |  5 PagesOthello Down Shakespeare s Othello comprises of the subjects betrayal, affection and dishonesty. At the focal point of this play is the lamentable ruin of Othello because of his so-called friend Iago. In this paper I will be examining the explanations behind and against Othello being in charge of his defeat through taking a gander at critical interpretations of his character and activities. Othello was profoundly in charge to his own destruction as Iago demonstrating to him to be gullible and