• Title/Summary/Keyword: Fin shape factor

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Comparison of Performance between Symmetric Trapezoidal Fins and Asymmetric Trapezoidal Fins (대칭 사다리꼴 핀과 비대칭 사다리꼴 핀의 성능 비교)

  • Kang, Hyungsuk
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.2
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    • pp.205-213
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    • 2016
  • Heat loss and fin efficiency of symmetric and asymmetric trapezoidal fins with variable slope of fin's top surface are obtained by using a two-dimensional analytic method. Shapes of symmetric and asymmetric fins are changed from rectangular through trapezoidal to triangular by adjusting the fin shape factor. The ratio of symmetric trapezoidal fin length to asymmetric trapezoidal fin length is presented as a function of fin base height and convection characteristic number. The ratio of symmetric trapezoidal fin efficiency to asymmetric trapezoidal fin efficiency is presented as a function of the fin base height and fin shape factor. One of results shows that asymmetric trapezoidal fin length is shorter than symmetric trapezoidal fin length (i.e., asymmetric trapezoidal fin volume is smaller than symmetric trapezoidal fin volume) for the same heat loss when the fin base height and fin shape factor are the same.

ANALYSIS OF A REVERSED TRAPEZOIDAL FIN USING A 2-D ANALYTIC METHOD

  • Kang, H.S.
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • v.14 no.3
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    • pp.151-161
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    • 2010
  • A reversed trapezoidal fin is analyzed using a two-dimensional analytical method. Heat loss from the reversed trapezoidal fin is presented as a function of the fin shape factor, fin base thickness and the fin base height. The relationship between the fin tip length and the convection characteristic number as well as that between the fin tip length and the fin base height for equal amounts of heat loss are analyzed. Also the relationship between the fin base thickness and the fin shape factor for equal amount of heat loss is presented. One of the results shows that the heat loss decreases linearly with the increase of the fin shape factor.

Performance Analysis of a Geometrically Asymmetric Trapezoidal Fin for an Enhanced Heat Exchanger (향상된 열교환기를 위한 기하학적 비대칭 사다리꼴 핀의 성능 해석)

  • Song, Nyeon-Joo;Kang, Hyung-Suk
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.4
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    • pp.24-31
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    • 2011
  • Performance of the asymmetric trapezoidal fin with various upper lateral surface slopes is investigated by using the two-dimensional analytic method. For a fin base boundary condition, convection from the inner fluid to the inner wall, conduction from the inner wall to the fin base and conduction through the fin base are considered. Heat loss and fin efficiency are represented as a function of the fin base thickness, base height, inner fluid convection characteristic number, fin tip length and fin shape factor. One of the results shows that heat loss increases while fin efficiency decreases as the fin shape factor increases.

Optimization of an Asymmetric Trapezoidal Fin Based on the Fixed Fin Base Height (고정된 핀 바닥 높이에 기준한 비대칭 사다리꼴 핀의 최적화)

  • Song, Nyeon-Joo;Kang, Hyung-Suk
    • Journal of the Korean Society of Propulsion Engineers
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    • v.16 no.1
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    • pp.45-54
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    • 2012
  • Optimization of the asymmetric trapezoidal fin with various upper lateral surface slope is made using a two-dimensional analytic method. For the fixed fin base height, the optimum heat loss, fin length and effectiveness are represented as inner fluid convection characteristic number, fin base thickness, fin base height, fin shape factor and ambient convection characteristic number. For this optimum procedure, the optimum heat loss is defined as 95% of the maximum heat loss from the fin. One of the results shows that optimum heat loss and effectiveness seems independent of the fin shape factor while optimum fin length decreases almost linearly as the fin shape factor increases.

Analysis of a Geometrically Asymmetric Trapezoidal Fin with Variable Fin Base Thickness and Height

  • Kang, Hyung-Suk
    • International Journal of Air-Conditioning and Refrigeration
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    • v.16 no.3
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    • pp.83-88
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    • 2008
  • A geometrically asymmetric trapezoidal fin is analyzed using the one-dimensional analytic method. Heat loss and thermal resistance are represented as a function of the fin base thickness, base height, fm shape factor, inside fluid convection characteristic number, convection characteristic numbers ratio, fm length and ambient convection characteristic number. The relationship between the fin base height and the shape factor for equal amounts of heat loss is presented. One of the results shows that the variations of the fm base thickness and the inside fluid convection characteristic number give no effect on the thermal resistance.

Optimization of Convective Trapezoidal Profile Fin having Fluid inside the Wall (내벽에 유체가 있는 대류 사다리꼴 형상 Fin의 최적화)

  • Jeong Byung-Cheol;Lee Sung-Joo;Yoon Sea-Chang;Kang Hyung Suk
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.2
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    • pp.95-102
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    • 2006
  • This study analyzes and optimizes a design for a trapezoidal profile straight fin using one-dimensional analytical method. The heat transfer, fin length and fin height are optimized as a function of fin volume, fin shape factor and fin base length. In this optimization, convection characteristic number over fin surface and that of fluid inside fin wall are considered. One of the results shows that the maximum heat loss increases as fin volume increases and both fin shape factor and fin base length decrease.

An Experimental Study on Heat Transfer and Pressure Drop of Air Side in a Plate-Louvered Fin Heat Exchanger (평판관-루버핀 열교환기의 공기측 열전달 및 압력강하 특성에 관한 실험적 연구)

  • 강병하;김석현;장혁재;박병규
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.6
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    • pp.485-492
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    • 2002
  • Heat transfer and pressure drop on the air side of a plate-louvered fin heat exchanger with new shape of louver fin have been investigated experimentally. Water is employed inside the flat tube to transfer heat with air for convenience. This problem is of particular interest in the design of a plate-louvered heat exchanger. The effect of air flow rate, water flow rate and water temperature on pressure drop as well as heat transfer in air side are studied in detail. The present results showed a good agreement qualitatively with the previous results in general. Based on the experimental data, f-factor and j -factor correlations of the present louvered-fin are suggested. It is also found that heat transfer could be enhanced with new shape of louver fin, compared with the conventional louvered-fin, while the f-factor remains unchanged.

Optimum Design of a Reversed Trapezoidal Fin with Variable Fin Base Thickness (핀 바닥 두께가 변화하는 역 사다리꼴 핀의 최적 설계)

  • Kang, Hyung-Suk
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.7
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    • pp.455-461
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    • 2008
  • A reversed trapezoidal fin with variable fin base thickness is optimized using a two-dimensional analytical method. For the fin base boundary condition, instead of a constant temperature, heat transfer from the inside fluid to the fin base is considered. Heat loss from the fin tip is not ignored. The maximum heat loss, corresponding optimum fin effectiveness, fin length and base height are presented as a function of the fin base thickness, shape factor and volume.

Analysis of Temperature Distribution and Heat Loss for an Asymmetric Trapezoidal Fin (비대칭 사다리꼴 핀의 온도분포와 열손실 해석)

  • Kang, Hyung-Suk;Song, Nyeon-Joo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.4
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    • pp.377-383
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    • 2012
  • The temperature distribution of an asymmetric trapezoidal fin with various upper lateral surface slopes is investigated by using the two-dimensional analytic method. For this asymmetric fin, convection from the inner fluid to the inner wall, conduction from the inner wall to the fin base and conduction through the fin base are considered simultaneously. The temperature profile with the variation of dimensionless fin length and height coordinates is shown. Also, the temperature variation at the bottom tip of the fin is presented as a function of the fin shape factor. Heat losses through the fin base and from each side are compared for variations in fin length. One of the results shows that temperature at the fin bottom tip decreases linearly as the fin shape factor increases.

Optimum Performance and Design of a Trapezoidal Fin (사다리꼴 핀의 최적 성능과 설계)

  • Kang, Hyung-Suk
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.11a
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    • pp.82-85
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    • 2006
  • A trapezoidal fin with various lateral surface slopes is designed optimally by using one-dimensional analytic method. For four different convection characteristic numbers, the trend of heat loss as a function of fin tip length is shown. The optimum heat loss is somewhat arbitrarily chosen as 92% of the maximum heat loss. The optimum fin length corresponding to this optimum heat loss versus convection characteristic number is presented. The optimum effectiveness and specific effectiveness is presented as a function fin shape factor.

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