• 제목/요약/키워드: Aluminum heat exchanger

검색결과 66건 처리시간 0.025초

경사지게 설치된 평행류형 알루미늄 열교환기의 공기측 전열 성능 (Air-side Performance of Aluminum Heat Exchangers at Different Inclination Angles)

  • 김도영;조진표;김내현;박내현;황준현
    • 설비공학논문집
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    • 제20권3호
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    • pp.181-188
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    • 2008
  • The effect of inclination angle on the heat transfer and pressure drop characteristics of the brazed aluminum heat exchangers is experimentally investigated. Three samples having different fin pitches(1.25, 1.5 and 2.0 mm) were tested. Results show that heat transfer coefficient is not affected by the inclination angle. However, the friction factor increases as the inclination angle increases with negligible difference between the forward and backward inclination. Both the heat transfer coefficient and the friction factor are the smallest at $F_p=1.5mm$, followed by $F_p=2.0mm$ and 1.25mm. Possible explanation is provided considering the louver layout. Comparison with existing correlations is also made.

Characteristic of Frost Formed on Thermally Conductive Plain Plastic Plate

  • Lee Jang-Seok;Lee Kwan-Soo
    • International Journal of Air-Conditioning and Refrigeration
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    • 제13권3호
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    • pp.138-144
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    • 2005
  • In order to select a new material for a heat exchanger, the frosting behavior of a thermally conductive plastic based on PBT was compared to the frosting behavior of aluminum and three types of plastics based on PTFE. The frosting behavior on the 1 mm thick PBT specimen was similar to that of the aluminum specimen but not that of the pure PTFE specimen. The properties of the frost formed on the specimens were affected by both the thermal conductivity and surface characteristics of the materials. The heat and mass transfer rates of the thermally conductive plastic were almost equivalent to those of the aluminum specimen.

슬림형 루버 핀이 장착된 알루미늄 열교환기의 공기측 전열 성능에 대한 실험적 연구 (Experimental Study on the Airside Performance of Aluminum Heat Exchangers Having Slim Louver Fins)

  • 김내현;조홍기
    • 대한기계학회논문집B
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    • 제41권9호
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    • pp.587-595
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    • 2017
  • 최근 들어 공조기가 슬림화 되고 따라서 열교환기의 깊이를 줄일 필요가 있다. 본 연구에서는 슬림형 알루미늄 열교환기에 적절한 루버 핀 형상을 도출하였다. 또한 도출된 루버 핀이 적용된 알루미늄 열교환기 시료를 제작하고 성능 시험을 수행하였다. 비교를 위하여 기존 열교환기에 대해서도 실험을 수행하였다. 도출된 형상의 핀 깊이($F_d$)는 10.0 mm, 루버 핏치($L_p$)는 0.9 mm, 루버 각(${\theta}$)은 $35^{\circ}$이다. 기존 시료에 비하여 신규 슬림 시료의 j 인자는 36%, f 인자는 2.3% 크게 나타났다. 따라서 열교환기 체적은 슬림 시료에서 26% 줄어들게 된다. 또한 동일 소비 동력에서의 전열량을 의미하는 $j/f^{1/3}$은 슬림 시료에서 55% 크다. 실험 데이터를 기존 상관식의 예측치와 비교하였다.

유입 방향에 따른 알루미늄 평행류 열교환기 헤더내 공기-물 2 상류 분지 실험 (Air-water two-phase distribution in an aluminum parallel flow heat exchanger header having different inlet orientations)

  • 김내현;함정호;박태균;김도영
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회B
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    • pp.2108-2112
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    • 2007
  • The air and water flow distribution are experimentally studied for a round header-ten microchannel tube configuration. Three different inlet orientations (parallel, side, normal) were investigated. Tests were conducted with downward flow configuration for the mass flux from 70 to 130 kg/$m^2s$, quality from 0.2 to 0.6, non-dimensional protrusion depth (h/D) from 0.0 to 0.5. It is shown that, for almost all the test conditions, normal inlet yielded the best flow distribution, followed by side and parallel inlet. Possible reasoning is provided using flow visualization results.

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항균처리를 한 공조기기의 항균성능 평가방법과 평가결과

  • 미우라쿠니오;다까츠까다케시;야나기우;야마자키쇼지
    • 공기청정기술
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    • 제22권2호
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    • pp.40-49
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    • 2009
  • Aluminum thin plate coated with epoxy resin containing about 20wt% brass powder, was applied to fins of heat exchanger. We carried out a series of detailed examinations to evaluate the anti-bacterial performance of the plate and heat exchanger (fan coil unit). In the presence of water or moisture, copper ions which have an anti-bacterial ability eluted from brass powder and showed sufficient effects on many kinds of bacteria. We also evaluated the anti-bacterial performance quantitatively by use of the index API (Anti-bacterial Performance Index) which has already been proposed by authors.

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Ti 첨가에 의한 심재의 결정립미세화 처리가 4343/3003/4343 알루미늄 클래드 판재의 브레이징 특성에 미치는 영향 (The Effect of Grain Refinement by Ti Addition on Brazing Characteristic of 4343/3003/4343 Aluminum Clad Sheet)

  • 신제식;문병문
    • 한국주조공학회지
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    • 제30권5호
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    • pp.187-195
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    • 2010
  • In this study, in order to obtain a useful guide line for design and production of automotive heat exchanger components made of 4343/3003/4343 aluminum clad sheets, it was aimed to improve the understanding about the grain refinement effect on brazing characteristic of the clad sheets. Al-10Ti master alloy was used for grain refinement of 3003 core alloy, and the Ti inoculation level was systematically changed up to 0.1 wt%. The three-layer aluminum clad sheets were fabricated by hot roll bonding process. The effect of grain refinement on brazing characteristic of the clad sheets was investigated by evaluating wettability, bonding strength and sagging resistance.

원형 세관내 대류비등열전달에 관한 실험적 연구 (An Experimental Study of Flow Boiling Heat Transfer inside Small-Diameter Round Tubes)

  • 추원호;방광현
    • 설비공학논문집
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    • 제16권8호
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    • pp.748-755
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    • 2004
  • Flow boiling heat transfer in small-diameter round tubes has been experimentally studied. The experimental apparatus consisted mainly of refrigerant pump, condenser, receiver, test section of a 1.67 mm inner-diameter round tube and pre-heater for control of refrigerant quality at the inlet of test section. To investigate the effect of bubble nucleation site characteristics of different tube materials, three different tubes of copper, aluminum and brass were used. The ranges of the major experimental parameters were 5∼30 ㎾/$m^2$ of the wall heat flux, 0.0∼0.9 of the inlet vapor quality and the refrigerant mass flux was fixed at 600 kg/$m^2$s. The experimental results showed that the flow boiling heat transfer coefficients in small tubes were affected only by heat flux, but independent of mass flux and vapor quality. The effect of tube material on flow boiling heat transfer was observed small.

조합형 윅을 사용한 히트파이프의 작동특성에 관한 실험적 연구 (Experimental study on the working characteristic of a heat pipe with combined wick)

  • 홍진관;부준홍;정원복
    • 설비공학논문집
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    • 제11권2호
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    • pp.236-243
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    • 1999
  • Aluminum/Freon-22 heat pipes were manufactured and tested which have a special wick geometry combining axial groove and screen mesh. There were 14 axial grooves in a cross-section and these were covered by two layers of 350 mesh screens to enhance the thermal performance. The performance test was conducted by varying the thermal load and tilt angle. Furthermore, the operation limits and overall heat transfer coefficient were investigated. The experimental results will be useful in a variety of applications, especially in design and manufacturing of a high-efficiency heat exchanger and energy recovery systems.

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3D 프린팅 적용 철도차량용 공기압축기의 열교환기 설계 및 제작 기술 연구 (Design and Manufacturing Technology of Heat Exchanger in Air Compressor for Railroad Vehicle by 3D Printing Process)

  • 김무선
    • 한국산학기술학회논문지
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    • 제18권11호
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    • pp.802-809
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    • 2017
  • 3D 프린팅 제조 기술은 폴리머 및 금속 소재를 구조물 형상으로 적층하여 제품을 제작하는 성형기술로서, 설계 자유도가 높고 기능성을 요구하는 부품 제작에 유리하다. 또한 다품종 소량 생산 특성으로, 향후 철도 차량 부품 제작에 적합한 기술이다. 3D 프린팅 기술의 장점을 충분히 활용하기 위해서는 제품 설계시 공정 특성 고려가 필수이다. 이번 연구에서는 철도차량용 공기압축기의 열교환기를 대상으로, 3D 프린팅 기법 적용을 통한 제작을 위해, 성능과 공정조건을 고려한 제품의 재설계 및 제작 기술을 연구하였다. 먼저 열교환기의 성능을 높이기 위한 설계 컨셉을 정의하고 기존 열교환기의 시험을 통해 성능 분석 후, 이를 만족하기 위한 컨셉 설계 범위를 지정하였다. 또한 금속 3D 프린팅의 제작 한계 및 제작 시간, 특성 등을 고려하여, 상세 설계에 관한 수정을 진행하였다. 도출된 최종 설계안을 토대로, 알루미늄 소재를 사용하여 3D 프린팅 공정을 통해 제품을 제작하고 치수 정밀도를 만족함을 확인하였다. 최종 중량은 기존 제품 대비 41%의 중량 절감 효과를 보였다. 본 연구를 통해, 3D 프린팅 기술 활용을 위한 제품 설계 과정을 정립함으로써, 향후 3D 프린팅 기술 적용시 효율적인 설계가 가능할 것이다.