• Title/Summary/Keyword: RAC(Room Air Conditioner)

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Computational Flow Analysis on the Flow Field Improvement of an Indoor RAC by LES (LES에 의한 RAC 실내기의 유동장 개선에 관한 전산유동해석)

  • Kim, J.K.;Oh, S.H.
    • Journal of Power System Engineering
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    • v.16 no.3
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    • pp.29-36
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    • 2012
  • The computational flow analysis using LES technique was introduced to investigate the flow field improvement of an indoor RAC chassis consisting of a rear-guider, a stabilizer and a cross-flow fan. This unsteady three-dimensional numerical analysis was carried out by the commercial SC/Tetra software. The edge blocks were adopted in this study as a tool for the flow field improvement of an indoor RAC. In view of the results so far achieved, the edge blocks cause the center of an eccentric vortex to be stable along all length of a cross-flow fan, and then, the static pressure and the velocity vector show a stable distributions. In consequence, because the edge blocks eliminate a reverse flow near the edges, an exhausting flow becomes to be stable and uniform.

Computational Flow Analysis of a Cross-Flow Fan by LES (LES에 의한 관류홴의 전산유동해석)

  • Kim, J.K.;Oh, S.H.
    • Journal of Power System Engineering
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    • v.14 no.6
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    • pp.20-28
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    • 2010
  • The computational flow analysis using LES technique was carried out to investigate the flow characteristics of a RAC chassis consisting of a rear-guider, a stabilizer and a cross-flow fan. The commercial SC/Tetra software was used in this analysis. In view of the results so far achieved, the distribution trends of static pressure and velocity vector of central region except the edges of a CFFan are similar regardless of the number of revolution, and an eccentric vortex exists around the bottom blade of a CFFan. Also, a reverse flow is found in the region between stabilizer and CFFan. Moreover, near the edges of a CFFan, an eccentric vortex is separated to two vortexes. Also these vortexes increase the velocity near a rear-guider, and guide the flow near a rear-guider into stabilizer inlet. Therefore, the reverse flow region is formed in the bottom of a CFFan.

Source Identification and Reduction of Noise for the Outdoor Unit of Room Air Conditioner (에어컨 실외기의 소음원 규명 및 소음저감)

  • 서상호;임금식;이내영;진심원
    • Journal of KSNVE
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    • v.8 no.6
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    • pp.1043-1052
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    • 1998
  • The noise sources in the outdoor unit of RAC are identified by the sound intensity method. The main noise sources are compressor noise and fluid noise which is caused by the fan. heat exchanger and shroud. First. the fluid noise is reduced through the design of new fan and shroud. reduction of the system resistance by rearrangement of heat exchanger. and optimization of the complex parameter between the fan and shroud. Next, in order to reduce the compressor noise, the new shape of compressor mount and sound-proof material was applied. As a result, the overall noise was reduced by 4∼5dB (A).

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