Muffler(in American term) is a device used to decrease the noise created in exhaust system of internal combustion engine is also called as Silencer(in British English)APPLICATION
Silencer play a important role on industries to reduce the noise in exhaust system of inlet and outlet engine, some of the applications are listed below
Noise can be caused by number of factors including fans, the air pass through a straight duct and flow of air through component such as branches, elbows, tubes and so on.
Noise reduction silencers are categories into four types they are listed below
Absorptive silencer uses a fibrous material, which absorb sound waves. In HVAC duct system this type of silencer are frequently used. Absorptive silencers are simple straight through the design which minimize the restriction of air flow, It particularly good for high noise frequencies range from 500 to 800 HZ.
Reflective silencer is used for a fixed speed machinery which is producing pure tones. Reflective or reactive silencers are reducing noise in essentially reflect the sound waves back to source were they came from.
Diffuser type of silencers are used to slow down velocity and prevent the generation of low frequency noise, It is mainly applicable on nozzles control valves, jet engines and so on.
Active silencer is also known as “Noise cancelling silencer” which essentially cancelling the out disturbing sound, so they create a lack of sound by creating a noise.
Heating, ventilation and air conditioning (HVAC) is technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality.
In HVAC duct systems absorptive or dissipative silencers are frequently used for a noise reduction.
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