In today's world, where fuel prices are increasing as a
consequence of spiraling demand and diminishing supply, you need to
choose a cost effective fuel to meet your needs. Thanks to the invention
of Rudolph Diesel, the diesel engine has proved to be extremely
efficient and cost effective. Diesel fuel is priced moderately higher
than gasoline but diesel has a higher energy density, i.e. more energy
can be extracted from diesel as compared with the same volume of
gasoline. Therefore, diesel engines in automobiles provide higher
mileage, making it an obvious choice for heavy-duty transportation and
equipment. Diesel is heavier and oilier compared with gasoline, and has a
boiling point higher than that of water. And diesel engines are
attracting greater attention due to higher efficiency and cost
effectiveness.
How Does a Diesel Engine Work?
The distinction lies in the type of ignition. While gasoline engines operate on spark ignition, diesel engines employ compression - ignition for igniting the fuel. In the latter, air is drawn into the engine and subjected to high compression that heats it up. This results in a very high temperature in the engine, much higher than the temperature attained in a gasoline engine. At peak temperature and pressure, diesel that is let into the engine ignites on account of the extreme temperature
In a diesel engine, air and the fuel are infused into
the engine at different stages, as opposed to a gas engine where a
mixture of air and gas are introduced. Fuel is injected into the diesel
engine using an injector whereas in a gasoline engine, a carburetor is
used for this purpose. In a gasoline engine, fuel and air are sent into
the engine together, and then compressed. The air and fuel mixture
limits fuel compression, and hence the overall efficiency. A diesel
engine compresses only air, and the ratio can be much higher. A diesel
engine compresses at the ratio of 14:1 up to 25:1, whereas in a gasoline
engine the compression ratio is between 8:1 and 12:1. After combustion,
the combustion by-products are removed from the engine through the
exhaust. For starting during cold months extra heat is provided through
'glow plugs'.
Diesel engines can either be two cycle or four cycle
and are chosen depending on mode of operation. Air-cooled and
liquid-cooled engines are the variants to be chosen appropriately. It
is preferable to use a liquid-cooled generator as it is quiet in
operation and has evenly controlled temperature.
Advantages of a Diesel Engine
The diesel engine is much more efficient and preferable as compared with gasoline engine due to the following reasons:
The diesel engine is much more efficient and preferable as compared with gasoline engine due to the following reasons:
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Modern diesel engines have overcome disadvantages of earlier models of higher noise and maintenance costs. They are now quiet and require less maintenance as compared with gas engines of similar size.
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They are more rugged and reliable.
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There is no sparking as the fuel auto-ignites. The absence of spark plugs or spark wires lowers maintenance costs.
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Fuel cost per Kilowatt produced is thirty to fifty percent lower than that of gas engines.
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An 1800 rpm water cooled diesel unit operates for 12,000 to 30,000 hours before any major maintenance is necessary. An 1800 rpm water cooled gas unit usually operates for 6000-10,000 hours before it needs servicing.
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Gas units burn hotter than diesel units, and hence they have a significantly shorter life compared with diesel units.
Applications & Uses for Diesel Engines
Diesel engines are commonly used as mechanical engines, power generators and in mobile drives. They find wide spread use in locomotives, construction equipment, automobiles, and countless industrial applications. Their realm extends to almost all industries and can be observed on a daily basis if you were to look under the hood of everything you pass by. Industrial diesel engines and diesel powered generators have construction, marine, mining, hospital, forestry, telecommunications, underground, and agricultural applications, just to name a few. Power generation for prime or standby backup power is the major application of today's diesel generators. Check out our article on the various types of engines and generators and their common applications for more examples.
Diesel engines are commonly used as mechanical engines, power generators and in mobile drives. They find wide spread use in locomotives, construction equipment, automobiles, and countless industrial applications. Their realm extends to almost all industries and can be observed on a daily basis if you were to look under the hood of everything you pass by. Industrial diesel engines and diesel powered generators have construction, marine, mining, hospital, forestry, telecommunications, underground, and agricultural applications, just to name a few. Power generation for prime or standby backup power is the major application of today's diesel generators. Check out our article on the various types of engines and generators and their common applications for more examples.
Power Generators
Diesel powered generators, or electrical generator sets, are used in countless industrial and commercial establishments. The generators can be used for small loads, such as in homes, as well as for larger loads like industrial plants, hospitals, and commercial buildings. They can either be prime power sources or standby/back-up power sources. They are available in various specifications and sizes. Diesel generator sets rating 5-30KW are typically used in simple home and personal applications like recreational vehicles. Industrial applications cover a wider spectrum of power ratings (from 30 kW to 6 Megawatts) and are used in numerous industries throughout the globe. For home use, single-phase power generators are sufficient. Three-phase power generators are primarily used for industrial purposes.
Diesel powered generators, or electrical generator sets, are used in countless industrial and commercial establishments. The generators can be used for small loads, such as in homes, as well as for larger loads like industrial plants, hospitals, and commercial buildings. They can either be prime power sources or standby/back-up power sources. They are available in various specifications and sizes. Diesel generator sets rating 5-30KW are typically used in simple home and personal applications like recreational vehicles. Industrial applications cover a wider spectrum of power ratings (from 30 kW to 6 Megawatts) and are used in numerous industries throughout the globe. For home use, single-phase power generators are sufficient. Three-phase power generators are primarily used for industrial purposes.
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