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Parallel vs. serial noise suppression method for positive displacement (PD) compressors & internal combustion engines (ICE).

Number: pap. 1116

Author(s) : HUANG P. X., YONKERS S., GROLL E. A.

Summary

Positive displacement (PD) compressors and internal combustion engines (ICEs) are major energy consumers. For example, a typical US household may have as many as 7 compressors (2 in house AC, 2 in auto AC, 1 each for refrigerator or freezer or shop compressed air, refer to Soedel-2007) and 4 ICEs (2 in auto, 1 each for lawn mower and auxiliary power generator). Both technologies generate high amplitude pulsating pressures1 (up to 180-200 dB) and fluctuating discharge flows that demand a silencer or muffler to suppress noise but leads to high energy costs: up to 5-7% shaft power for PD compressors and up to 2-5% gasoline or diesel consumption for ICEs. Growing global demand for higher efficiency and lower noise for these systems is conflicting with the governing rule of serial muffling (Daniel, 2005) employed for the past 100 years: “More Noise Reduction, More Back Pressure Losses or Use Larger Size or Multiple Mufflers”. No current technology could meet both demands simultaneously due to the limitation of the current serial noise suppression methodology. The primary goal of this paper is to use a simple analogy with electric circuits to analyze and compare two dampening schemes: the traditional serial dampening configuration and a new parallel dampening method called SPT (Shunt Pulsation Trap, Huang, 2014). It will be demonstrated that SPT – a parallel noise suppression method will overcome this limitation and is capable of getting the pulsating noise under control with no back pressure losses. The SPT technology involves modifications to a standard PD compression cycle from a serial mode, that is, treats or dampens the noise generating source ?P (Poutlet-Pcavity) after discharge, to a parallel mode before discharge. Noise Suppression Rules are summarized for optimum applications to various PD type compressors and ICEs. Then the results are applied to a 350 hp Roots blower for power loss calculations and compared with previous experimental data, proving that a substantial and consistent energy saving can be achieved with dampening configuration change from a serial one to a parallel one.

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Pages: 11

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Details

  • Original title: Parallel vs. serial noise suppression method for positive displacement (PD) compressors & internal combustion engines (ICE).
  • Record ID : 30024218
  • Languages: English
  • Subject: General information
  • Source: 2018 Purdue Conferences. 24th International Compressor Engineering Conference at Purdue.
  • Publication date: 2018/07/09

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