• Title/Summary/Keyword: 마이크로 채널 열교환기

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마이크로 채널 기반의 극저온용 열교환기 개발

  • Yun, Seok-Ho;Choe, Jun-Seok;Park, Sang-Jin
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.38 no.3
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    • pp.24-27
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    • 2009
  • 열교환 효율이 높고 소형화에 유리하여 차세대 열교환기 기술로 떠오르고 있는 마이크로 채널기반의 열교환기를 극저온 LNG 플랜트에 적용하기 위한 연구에 대하여 소개하고자 한다.

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Experimental Study of Evaporative Heat Transfer Characteristics of R-134a with Channel-Bending Angle in Microchannel Heat Exchangers (마이크로채널 열교환기에서 채널 굽힘 각도에 따른 R-134a의 증발열전달 특성에 관한 연구)

  • Lee, Hae-Seung;Jeon, Dong-Soon;Kim, Young-Lyoul;Kim, Seon-Chang
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.34 no.6
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    • pp.635-642
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    • 2010
  • Experimental investigations have been carried out to examine the evaporative heat transfer characteristics of R-134a with the channel-bending angle (CBA) in microchannel heat exchangers. In this study, we examined the effects of evaporation temperature and Reynolds number of R-134a on the evaporative heat transfer characteristics of R-134a in microchannel heat exchangers with CBAs of $120^{\circ}$, $150^{\circ}$, and $180^{\circ}$ under counterflow conditions. Experimental results show that the evaporative heat transfer rate and evaporative heat transfer coefficient increased with an increase in the Reynolds number of R-134a. Further, the evaporative heat transfer rate corresponding to CBAs of $120^{\circ}$ and $150^{\circ}$ increased to values greater than the evaporative heat transfer rate corresponding to $180^{\circ}$ by approximately 17.1% and 13.3%, respectively, for evaporating temperatures in the range $4.9-14.9^{\circ}C$. The evaporative heat transfer coefficient was affected by the channel angle with increasing evaporative heat transfer coefficient at small channel bending angle.

에어컨용 열교환기의 고성능화 개발

  • 하야세 가쿠
    • Journal of the KSME
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    • v.54 no.5
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    • pp.49-53
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    • 2014
  • 이 글에서는 에어컨용 열교환기의 고성능화에 관해서, 종래의 Fin & Tube방식부터 최신의 마이크로 채널 방식까지의 개발 사례를 소개하고자 한다.

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마이크로 채널 증발기 내 냉매분배

  • Byeon, Ho-Won;Kim, Nae-Hyeon
    • Journal of the KSME
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    • v.54 no.5
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    • pp.32-35
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    • 2014
  • 이 글에서는 최근 자동차 및 가정용 공조기의 증발기로 널리 사용되고 있는 알루미늄 마이크로 채널 열교환기 내의 냉매분배 특성과 그의 개선 방안에 대하여 소개하고자 한다.

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Numerical Study on the Performance of a Microchannel Heat Exchanger with a Novel Channel Array (새로운 채널 배열을 통한 마이크로채널 열교환기 성능 향상 수치 연구)

  • Jeon, Seung-Won;Lee, Kyu-Jung;Moon, Dong-Ju
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.11
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    • pp.1119-1126
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    • 2011
  • In conventional microchannel heat exchangers, only one kind of fluid (hot or cold) flows in each plate. The channels contain different kinds of fluid depending on the vertical position, but they have the same kind of fluid at all horizontal positions. Therefore, there is a slower heat transfer rate in the horizontal direction than in the vertical direction. We propose a microchannel heat exchanger in which hot and cold fluid flows alternately in each plate to improve the thermal performance. This novel channel array requires a special design for the inlet and outlet. The proposed channel array has a faster heat transfer rate than a conventional channel array. The thermal performance of the novel channel array increases with increasing Reynolds number and Prandtl number, but it decreases as the ratio of solid to fluid thermal conductivity increases.

An Experimental Study on Heat Transfer Characteristics and Pressure Drop in Micro Plated Heat Exchangers with S-shape of Microchannel (S 형상의 마이크로 채널을 가진 마이크로 판형 열교환기의 열전달 특성 및 압력강하에 관한 실험적 연구)

  • Seo, Jang-Won;Kim, Yoon-Ho;Moon, Chung-Eun;Lee, Kyu-Jung
    • Proceedings of the KSME Conference
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    • 2007.05b
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    • pp.1876-1881
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    • 2007
  • The micro plated heat exchangers were designed to transfer more heat/volume or mass than previous heat exchangers within the context of the design constraints specified. The increase of the surface-to-volume ratio results in an increase of the interfacial area. This enhances considerably the performance of a heat exchanger. This can be an important component in a wide range of applications fuel cell, aerospace, automotive, electronic system and home heating, etc). In this study, the performance evaluation of micro plated heat exchangers under the counter flows with straight and S-shaped channel are carried out. The pressure drop as well as inlet and outlet fluid temperature were measured at steady state under various operating conditions and the total heat transfer rate were also calculated.

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Evaluation of Performance of a Residential Air-Conditioning System Using Microchannel and Fin-and-Tube Heat Exchanger (마이크로채널과 핀 튜브 열교환기를 적용한 가정용 에어컨디셔너의 성능 평가)

  • Yun, Rin
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.19 no.1
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    • pp.28-35
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    • 2007
  • In this study the seasonal performance of a residential air conditioning system having either a fin-and-tube condenser or a microchannel condenser is experimentally investigated. A commercially available 7 kW capacity residential air conditioning system having a fin-and-tube condenser served as the base system. The test results show that the system with a microchannel heat exchanger has a reduced refrigerant charge amount of 10%, the coefficient of performance is increased by 6% to 10%, and the SEER is increased by 7% as compared with those of the base system. Moreover, the condensing pressure of the system is decreased by 100 kPa and the pressure drop across the condenser is decreased by 84%. The microchannel heat exchanger enhances the SEER of the residential air conditioning system by providing better heat transfers at reduced pressure drops.

Numerical Simulation of Thermal Performance of Printed Circuit Heat Exchangers with Microchannels of Different Shapes (마이크로채널 형상에 따른 PCHE 열유동 수치해석)

  • Cho, Yeon-Hwa;Lee, Kyu-Jung;Moon, Dong-Ju;Kim, Yoon-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.1
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    • pp.61-66
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    • 2011
  • The performance of microchannel PCHE (Printed Circuit Heat Exchanger) is superior to that of other existing commercial heat exchangers. Further, it is also more efficient than other heat exchangers. Various microchannels, whose shapes are straight (I), Wavy, Beehive, Surf, I-Wavy, I-Beehive, or I-Surf, are computationally modeled in this study. The counter-flow arrangement is used, and the flow characteristics, heat transfer, and pressure drop in the microchannels under various mass flow rate conditions are investigated. The results for I microchannel is chosen as the benchmarks and is compared with those of newly proposed microchannels. It is found that the surf-shaped microchannel is most efficient in improving the overall performance of a PCHE.

Numerical Study of Heat Transfer Enhancement on Microchannel Plate Heat Exchanger with Channel Shape (채널 형상에 따른 마이크로채널 판형 열교환기 열전달 성능 향상에 관한 수치 연구)

  • Jeon, Seung-Won;Kim, Yoon-Ho;Lee, Kyu-Jung
    • Proceedings of the KSME Conference
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    • 2007.05b
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    • pp.1888-1893
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    • 2007
  • In this study, the microchannel plated heat exchanger were numerically studied for the enhancement of heat transfer in the channel configuration. Unit cold and hot fluid region with the microchannel were modeled and periodic boundary condition at the side wall was applied to continuously repeating geometry. The material of micro-structured plate is STS304 and working fluid is water. Triangular obstacles were placed in micro channel to enhance heat transfer. The performance of microchannel plated heat exchangers were numerically investigated with various obstacle configuration and Reynolds number under the parallel and counter flows. Heat transfer rate has increased about 18% compared with straight channel, but pressure drop also increased about 3.5 times. The main factor of increasing of pressure drop and heat transfer rate is considered that the momentum was lost to collide against obstacles, generation of secondary flow and boundary layer separation, wake and vortex forming phenomena.

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