Engine Efficiency Essay

1107 words - 4 pages

Ever since the invention of the internal combustion engine, scientists and engineers have worked to increase its efficiency. As it stands now, the average internal combustion automobile engine only converts roughly 20% of its energy into useful motivational power. Most of the rest is expended through heat loss in various locations.

The cooling system in an automobile is used to remove heat from all the moving parts so that they can still
function properly without melting, seizing, or overheating. If an engine was ideal, it would release no heat because all of its energy would be converted into the power transferred to the wheels, but no such engine exists in reality. With all the many moving parts that must remain in contact with one another (in order to maintain compression and prevent various other leaks), friction is inevitable and thus, so is heat. Therefore, the cooling system in the car is exceedingly important.

The way it works is basically a simple matter of heat transfer. Water cooled vehicles use a combination of air
and liquid cooling mechanisms, routing coolant hoses past the hotter parts of the engine so that heat can transfer from the engine parts into the coolant, which then goes back into the radiator to be cooled off by the incoming air. Air cooled vehicles typically have large fans installed strategically on the engine and heat dissipating fins on the heads.

What may come as a surprise to some is that the heater in the cab of your car is actually a part of the car's
cooling system. Heat that is removed from the engine is simply piped into the cab so that the driver doesn't freeze to death in the middle of winter. The removal of this heat draws colder air into the engine compartment from outside which provides cooling circulation to the automobile's vital moving parts.

One of the major reasons for the loss of efficiency in an engine is the sheer number of parts moving at high
speeds. The movement creates great amounts o f friction between parts, which uses much of their moving energy to create heat. Lubricants and cooling systems can only do so much about this problem, and the typical internal combustion engine remains only about 20-25% efficient.

One can calculate the engine efficiency of a Carnot cycle engine using the thermal efficiency equation:
ec = 1- (Tc/Th)
This equation does not portray the level of inefficiency in a normal combustion engine because everyday engines experience more frictional effects.

The process shown below is an illustration of the movement of a piston in a four-stroke engine. The strokes are,
from left to right, intake, compression, ignition, power, and exhaust. This process is important to illustrate because inside the cylinders is where engines lose a great deal of potential power to heat expenditure. Friction between the cylinder wall and the sides of the piston creates resistance and heat, some of the ignition heat conducts through the...

Find Another Essay On Engine Efficiency

DNT - Rudolph Diesel - Inventor of the diesel engine

894 words - 4 pages business and dedicated himself entirely to the realisation of his engine. A test engine was completed on July, 1893 in Augsburg. This was the first model built and it ran under its own power with 26% efficiency, remarkably more than double the efficiency of the steam engines of his day. Finally, in February of 1897, he ran the "first diesel engine suitable for practical use", which operated at an amazing efficiency of 75%.Diesel demonstrated his

Automotive emissions Essay

996 words - 4 pages The aim of this assignment is understand how come we can interact with the engine to get better results in terms of emissions, efficiency, and fuel consumption.First of all it's necessary understand each emission, and what is causing it.The 'celebrity' of the emissions today is for sure CO2, this emission is causing the global warming. This gas comes directly from the combustion process, and can't be eliminated when we're working with both

graduation project12171943

744 words - 3 pages efficiency of the engine. Cold air is much denser than warm air, thus containing more oxygen which leads to more combustion in the engine. Oxygen is highly flammable when compressed, therefor more oxygen equals more fire, and more fire means more power. Superchargers are a fairly easy but expensive engine modifications, costing around two thousand to four thousand dollars. A supercharger compresses the air and fuel mixture of an engine by forcing air

The Development of the Steam engine due to James Watt

1642 words - 7 pages engine was much better for efficiency and 66% cheaper running costs! However many coal mines and textile factories had invested in a Newcomen engine and so could not afford to invest in Watt's engine even though long-term it would save the company money. To overcome this problem, Watt realised that the engine had to somehow be made more cheaply and so be more affordable. Then companies could be persuaded to re-invest in the better engine. He achieved

Fuel Efficiency Technology

1606 words - 6 pages fuel mixture by spark ignition. Although modern engine technology has led to increased fuel efficiency; pollutants emitted from cruise ships, cargo ships, and shipping accidents has led to a growing concern for ocean and lake contamination. Cruise ships have been known to create up to 37,000 gallons of Bilge water daily(Howstuffworks), and when the Exxon-Valdez shipwreck occurred an estimation of 11 million gallons of crude oil spilled from the

The Diesel Hybrid Combustion Engine

1321 words - 5 pages The Diesel Hybrid Combustion Engine Two main types of engines powering everyday machinery are diesel and gasoline internal combustion engines. Both vary on efficiency levels, but are still effective. Diesel engines have high efficiency levels, such as producing great amount of torque at very low rpms. They are also known for their fuel-efficient behavior and capability to produce low emissions. Their capability

A quick history of the jet engine

558 words - 2 pages first in 1949 . This marks the start of a new era. Until now designers were looking at ways to get more power, not being very considerate of the cost involved. Now new designs were looking at solution to produce more power but by increasing efficiency rather than burning more fuel. This is exactly how the jet engine will develop. Going from the very basic axial compressor engine to the twin spool engine and finally to the latest design of the multi

Modelling Torque Converters

3503 words - 14 pages converter model that is able to capture both transient and steady-state characteristics. The torque converter is connected to a mean-value engine model, transmission model, and longitudinal dynamics model in the MapleSim environment, which uses the advantages of an acausal modeling approach. A lock-up clutch is added to the torque converter model to improve the efficiency of the powertrain in higher gear ratios, and its effect on the vehicle longitudinal

Rudolf Diesel

917 words - 4 pages Rudolf Diesel was born on March 18, 1858 in Paris and was the son of a leather merchant. He died on September 29, 1913 while crossing the English Channel. Rudolf Diesel studied in England and at the Polytechnic School in Munich where he then settled. He began his career as a refrigerator engineer. Diesel also worked from 1893-1897 at the Augsburg Machine-Works developing a working engine. He worked for ten years on various heat engines

Performance Test of a Compression Ignition Engine.

1822 words - 7 pages Performance Test of a Compression Ignition EngineMatthew Steven, 0503527AimTo investigate the fundamentals of a compression ignition (I.C.) engine with respect to performance by determining the efficiency and where losses occur.ObjectivesThe objective of this report is to:Measure the performance of a compression ignition engine.Measure the mechanical losses in the engine.Measure the heat losses.MethodAfter allowing the engine to warm up the fuel

The History of Diesel Electric Locomotives

1278 words - 5 pages . Electricity provides a limitless cheap source of power run at much higher standards of efficiency, speed and cleanliness. Early experimental ventures into electric locomotives are vague without a reliable source of documentation (Haut 21).Some electric prototypes begin development as early as 1835 but was abandoned as not practical in the steam era. More experiments followed without success until 1880 (Haut 22). Early prototypes in 1879 used 150

Similar Essays

Efficiency Of Internal Combustion Engine Essay

1285 words - 5 pages cylinders. Valves send liquid fuel to cylinders and after burning they send CO2 AND CO to outside. Next paragraphs they will be explained again and what is done on them will explained. The working of engine is explained. The other important part for engine is their efficiency. Efficiency means ratio of power taken and power given. The efficiency of internal combustion engine is about 14 % - 26 % (U.S. Department of Energy). People can think that what

Energy Demand Essay

623 words - 2 pages fuel; yellow grease methyl ester; soybean oil methyl ester and soybean oil methyl ester containing 0.75 and 1.5 w/w % of the cetane improver 2-ethylhexy nitrate on the energy and exergy efficiencies. This study concluded that a lower cetane number fuel, a longer ignition delay period and a higher level of premixed combustion may increase the exergy efficiency of a diesel engine. The exergetic efficiencies of the fuels were soybean oil methyl

The Evolution Of The Internal Combustion Engine

1620 words - 6 pages HCCIs, which deliver diesel-like efficiency in a gasoline engine. This and other improvements in the internal combustion system are designed to enable better fuel consumption, cleaner engine-out emissions, improved performance, and reduced need for expensive, bulky catalytic converters (“Powertrains Drive The Future of Engine Design”1). For the future of internal combustion fuel, scientists and developers are looking towards hydrogen. They are not

Experimental Utilization Of 2 Ethoxy Ethyl Acetate

1404 words - 6 pages Introduction The diesel engine dominates the field of commercial transportation and agricultural machinery on account of its superior fuel efficiency. However they emit more emissions. The use of oxygenated fuels seems to be a promising solution towards reducing emissions in existing and future diesel engines. Oxygenated fuel is a chemical compound containing oxygen. It is used to help fuel burn more efficiently and cut down on some types of