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首页> 外文期刊>Journal of enhanced heat transfer: Theory and application in high performance heat and mass transfer >COMPARISON OF THE AIRSIDE PERFORMANCE OF FIN-AND-TUBE HEAT EXCHANGERS UNDER WET CONDITIONS-EFFECTS OF FIN PATTERN AND TUBE GEOMETRY
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COMPARISON OF THE AIRSIDE PERFORMANCE OF FIN-AND-TUBE HEAT EXCHANGERS UNDER WET CONDITIONS-EFFECTS OF FIN PATTERN AND TUBE GEOMETRY

机译：COMPARISON OF THE AIRSIDE PERFORMANCE OF FIN-AND-TUBE HEAT EXCHANGERS UNDER WET CONDITIONS-EFFECTS OF FIN PATTERN AND TUBE GEOMETRY

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摘要

The air-side thermal performances under wet conditions are investigated for fin-and-tube heat exchangers with different fin patterns and tube geometry. The fin configuration consisted of the herringbone (H) and sinusoidal (S) fins. The tube geometry included the round (R) and oval (O) tubes. A total of nine samples consisted of three HR, three SR, and three SO samples. For all samples, the fin pitch was 3.0 mm, and tube row was varied from one to four. The heat transfer coefficient was the highest for SR, followed by HR and SO. The ratio of wet-to-dry heat transfer coefficient (ho,wet/ho,dry) was also the highest for SR, followed by HR and SO. The pressure drops of the smooth wave fin samples (SR) were larger than those of the herringbone wave fin (HR). Similarly, the round tube geometry yielded larger pressure drops than the smooth tube geometry. The wet condition yielded 42% to 62% larger pressure drops than the dry condition. The poor wet surface performance (compared with the dry case) of the oval tube sample (SO) may be due to the blocking of the condensate drainage by the flat tubes.

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