A tremendous quantity of water can be saved if the air cooling system is
used, comparing with the ordinary water-cooling technology. In this study,
two kinds of finned tube heat exchangers in an indirect air-cooling tower are
experimentally studied, which are a plain finned oval-tube heat exchanger and
a wavy-finned flat-tube heat exchanger in a cross flow of air. Four different
air inlet angles (90?, 60 ?, 45?, and 30?) are tested separately to obtain
the heat transfer and resistance performance. Then the air-side experimental
correlations of the Nusselt number and friction factor are acquired. The
comprehensive heat transfer performances for two finned tube heat exchangers
under four air inlet angles are compared. For the plain finned oval-tube heat
exchanger, the vertical angle (90?) has the worst performance while 45? and
30? has the best performance at small ReDc and at large ReDc, respectively.
For the wavy-finned flat-tube heat exchanger, the worst performance occurred
at 60?, while the best performance occurred at 45? and 90? at small ReDc and
at large ReDc, respectively. From the comparative results, it can be found
that the air inlet angle has completely different effects on the
comprehensive heat transfer performance for the heat exchangers with
different structures.
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