The following article looks at silent generators.
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The report focuses on the components of the generators that attenuate sound. It begins with a brief introduction to silent generators and then goes on to list some of the components responsible for the sound attenuation.
Silent generators are designed to reduce the sound pollution caused by other generators. The generators have portable engines that owners do not need to hear once they are powered on.
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The noise of generators is produced by a cooling fan, engine, alternator, mechanical vibration, engine exhaust and inductive noise. The engine type, cooling system and spin speed also influence the noise produced.
The silent generators emit some noise, but the noise is always lower than the World Health Organization limit of 70 dBa.There are seven ways of reducing generator noise regardless of its type. These ways are sound insulation, reducing source’s sound level, acoustic barriers, insulation mounts, the cooling of air attenuation, maximizing distance between the receiver of noise and generator set and exhaust mufflers.
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This is the use of rigid materials of significant stiffness and mass to reduce the sound transmission. Elimination of sound leaks from cracks in walls or doors, leaks access points, electrical wiring or fuel also reduces the noise. Some of the rigid materials used include concrete blocks, blocks filled with sand, or steel sheet cabinets.
This is the use of materials that absorb sound to cover ceilings, walls and air ducts. The materials installed are commonly resistant to engine contaminants and oil. The cost of the material used affects the silent generator price in Kenya. Foam and fibreglass are the most suitable. The material used depends on its availability, cost, fire resistance, density, abrasion resistance and aesthetics.
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Cooling of air attenuation
The movement of cooling air in the generator’s radiator and its engine produces a significant amount of noise. Attenuation baffles can be fitted at air inlets and outlets to reduce this noise. Placing the radiator on the ceiling can direct the noise upwards and away from workers. Making the air flow in conduits at ninety degrees reduces the noise of high frequency.
Most generators are fitted with generator exhaust mufflers to reduce the noise emitted from the exhaust. The mufflers are either of spiral type or chamber type. The spiral type is more compact, but the chamber type is more effective. Mufflers are made of either stainless steel or rolled steel. Mufflers come at different prices, consequentlyaffecting the silent generator price in Kenya and other countries.
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The noise produced by generators decreases by about sixdBa every time the distance gets doubled. Increasing the distance between the sound receiver reduces the amount of noise they are affected by. The method can be used by transferring generators to the furthest area from people in a building or home.
Silent generators are recommended as noise harms the hearing of people. The devices are designed to reduce the amount of noise produced to acceptable levels. Silent generators provide the same reusable features and power as the other generators.