Effect of the air outlet louver on the noise generated by the outdoor set of a split-unit air conditioner

Hu, Junwei; Ding, Guoliang

doi:10.1016/j.applthermaleng.2005.10.032

Cited by 12 publications

(10 citation statements)

References 9 publications

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“…4 To avoid unnecessary physical discomfort and illness for passengers caused by long-term exposure to excessive noise, research into noise reduction is receiving growing attention. 5,6 The majority of studies from the industrial sector have focused on the impact of noise on the crew's work efficiency. A review of the literature reveals that it is well established that noise has substantial negative influences on people's lives, work and physical and mental health.…”

Section: Introductionmentioning

confidence: 99%

“…4 To avoid unnecessary physical discomfort and illness for passengers caused by long-term exposure to excessive noise, research into noise reduction is receiving growing attention. 5,6…”

Section: Introductionmentioning

confidence: 99%

“…11,12 The main noise source from the air-conditioning unit is the pneumatic blower, 13 for which the traditional noise reduction strategies include changing the design of the blowers and their blades. 6,14 However, because accommodation cabins are generally far away from the air-conditioning machine room, most of the air-conditioner noise comes from indoor units. The second strategy is noise reduction along the transmission path.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of aerodynamic noise performance of improved air distributor for ships

Guo

Feng

Lei

et al. 2021

Advances in Mechanical Engineering

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In ships, aerodynamic noise from the variable-air-volume fan is a common problem. This study experimentally explores the strategy of reshaping the traditional C-shaped channel structure to an L-shape to reduce noise. The noise level and resistance coefficient of the improved air distributor are analysed, and the results show that the noise of the original air distributor is 56.3 dB(A) under the rated working conditions (static pressure of 800 Pa and flow rate of 350 m3/h), which exceeds the International Maritime Organisation’s (IMO) ship noise limit (55 dB(A)). For the improved air distributor, the noise pressure level is 38.5 dB(A), the sound pressure level of high-frequency noise is reduced by 48% and the peak sound pressure level appears at 125 to 250 Hz, a frequency below the threshold of human hearing. Thus, the reshaping of the channel has a significant noise reduction effect. When the static pressure is 400 Pa and the flow rate is 100 to 500 m3/h, the sound pressure level of the improved air distributor is reduced by 29.9% to 32.2% to become less than 55 dB(A). Thus, the sound pressure level at the outlet of the improved air distributor meets the IMO ship noise standard.

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Section: Introductionmentioning

confidence: 99%

“…4 To avoid unnecessary physical discomfort and illness for passengers caused by long-term exposure to excessive noise, research into noise reduction is receiving growing attention. 5,6…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study of aerodynamic noise performance of improved air distributor for ships

Guo

Feng

Lei

et al. 2021

Advances in Mechanical Engineering

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“…17 Besides, accessories of the fan also have great impact on its aerodynamic and aeroacoustic performances. 18,19…”

Section: Introductionmentioning

confidence: 99%

“…17 Besides, accessories of the fan also have great impact on its aerodynamic and aeroacoustic performances. 18,19 Deflecting ring, as an important accessory for the axial flow fan, can also be used to improve the efficiency of the fan for blocking off the radial migration of boundary layer fluid centrifuged from the hub on the suction side. 20,21 When the shroud exists, the flow field will be constrained with higher stability, at the same time, the fan performance varies significantly with the variation of relative positions between the fan and shroud.…”

Section: Introductionmentioning

confidence: 99%

Investigation of aerodynamic performance of small axial flow fan coupled with deflecting ring

Huang

Zheng

Liu

2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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Experimental and numerical investigations on the effect of deflecting rings featuring different axial lengths on aerodynamic performance of the small axial flow fan were conducted under the condition of maximum flow rate. Two deflecting rings, the semi-open type and closed type, were investigated. Aerodynamic and aeroacoustic performances have been measured in experiment, and key analysis of flow was based on computational fluid dynamics results. The numerical and experimental results show that the deflecting ring has great influence on the performance of an axial flow fan. For the semi-open-type deflecting ring, the fan has better P-Q performance and higher efficiency; pressure, vorticity, and vorticity gradient distributions on the blade surface are more uniform; and noise level of the fan is lower at wider frequency bands. For the closed-type deflecting ring, the performance curve has a convex feature; blade pressure difference between the pressure surface and the suction surface is much bigger. The result shows that better aerodynamic and aeroacoustic performances of the axial flow fan can be acquired when the semi-open-type deflecting ring is adopted.

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Comprehensive study of the impacts of surrounding structures on the aero-dynamic performance and flow characteristics of an outdoor unit of split-type air conditioner

2017

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Effect of the air outlet louver on the noise generated by the outdoor set of a split-unit air conditioner

Cited by 12 publications

References 9 publications

Experimental study of aerodynamic noise performance of improved air distributor for ships

Experimental study of aerodynamic noise performance of improved air distributor for ships

Investigation of aerodynamic performance of small axial flow fan coupled with deflecting ring

Comprehensive study of the impacts of surrounding structures on the aero-dynamic performance and flow characteristics of an outdoor unit of split-type air conditioner

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