Airside performance of fin-and-tube heat exchangers having sine wave fins under wet condition

Experiments were conducted on sine wave fin-and-tube heat exchangers having oval tubes of 0.6 aspect ratio. Twelve samples having different fin pitches and tube rows were tested. Eight herringbone wave fin-and-tube heat exchangers having round tubes were also tested. For round tube samples, the effect of tube row on j factor is not prominent. For oval tube samples, however, the highest j factor is observed for two row configuration, whereas the lowest one is observed for one row configuration. Possible reasoning is provided considering the flow and heat transfer characteristics of sine wave channel combined with connecting oval tubes. The friction factor decreases as number of tube row increases. Comparison with round tube samples reveals that airside performance of oval fin-and-tube heat exchangers is generally superior except for one-row configuration.

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Comparison of the Airside Performance of Fin-and-Tube Heat Exchangers Under Wet Condition – Effects of Fin Pattern and Tube Geometry

Journal of Enhanced Heat Transfer ◽

10.1615/jenhheattransf.2021039979 ◽

2021 ◽

Author(s):

Nae-Hyun Kim

Keyword(s):

Heat Exchangers ◽

Wet Condition ◽

Tube Geometry

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AIRSIDE PERFORMANCE OF FIN-AND-TUBE HEAT EXCHANGERS HAVING SINE WAVE OR SINE WAVE-SLIT FINS

Journal of Enhanced Heat Transfer ◽

10.1615/jenhheattransf.2013006564 ◽

2013 ◽

Vol 20 (1) ◽

pp. 43-58 ◽

Cited By ~ 2

Author(s):

Nae-Hyun Kim ◽

Baek Youn

Keyword(s):

Heat Exchangers ◽

Sine Wave

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HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS OF FIN-AND-TUBE HEAT EXCHANGERS HAVING SPIRAL FINS UNDER WET CONDITIONS

International Journal of Air-Conditioning and Refrigeration ◽

10.1142/s2010132511000533 ◽

2011 ◽

Vol 19 (03) ◽

pp. 185-193 ◽

Cited By ~ 4

Author(s):

JIN-WOOK LEE ◽

NAE-HYUN KIM ◽

HYUN-MIN SIM

Keyword(s):

Heat Transfer ◽

Pressure Drop ◽

Heat Exchangers ◽

F Factor ◽

Wet Condition ◽

Wet Surface

In this study, wet surface j and f factors were obtained for spiral fin-and-tube heat exchangers. Nine samples having different fin pitches (2.12, 2.54 and 3.18 mm) and different tube rows (1, 2 and 3 row) were tested. Data are compared with those of the dry surface. For the wet surface, the effect of fin pitch on j factor is not significant. However, f factor decreases as the number of tube row increases. The j factor increases as the number of tube row increases. Different from the j factor, f factor decreases as the number of tube row increases. At one row configuration, the dry surface j factor is larger than that of the wet surface one. As the number of tube row increases, the trend is gradually reversed. Possible reasoning is provided considering the condensate behavior under wet condition. A new j and f factor correlation is developed, which predicts j and f factors within ± 20% and ± 30%, respectively.

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