Effect of number of tube rows on the air-side performance of crimped spiral fin-and-tube heat exchanger with a multipass parallel and counter cross-flow configuration

Air-side performance of serrated welded spiral fin-and-tube heat exchangers

“…6. The j-Colburn factor and f-friction factor of serrated welded spiral fin-and-tube heat exchanger at fin pitch of 4.2 mm in this study are compared with Pongsoi et al [12] (for crimped spiral fin), Pongsoi et al [15] (for L-footed spiral fin), Wang and Chang [28] and Wang et al [29] (for plain fin), and Briggs and Young [30] and Robinson and Briggs [31] (for circular fin) correlations, as shown in Fig. 6(a) (for j-Colburn factor) and Fig.…”

“…In this study, the serrated welded spiral fin-and-tube heat exchangers having Z-shape tube arrangements and the 2 tube rows are investigated by using the experimental apparatus of Pongsoi et al [11][12][13][14][15] and Pongsoi and Wongwises [16], including the water flow loop, air-flow supply, measuring instruments, and data acquisition. The detailed geometrical parameters of the test sections are shown according to Table 1.…”

“…The working fluids are ambient air and hot water for air-side and water-side, respectively. Moreover, the detailed descriptions of the relevant components can be seen from [11][12][13][14][15][16]. For the experimental conditions, as shown in Table 2, the temperature and flow rate of waters are fixed while varying the ambient air flow rate in range of high Reynolds numbers (4000-15,000).…”

“…Further details about the data reduction can be seen from Pongsoi et al [11][12][13][14][15][16]. The efficiency of a radial fin with rectangular profile is based on the derivation of Gardner [20], i.e.,…”

Seasonal Performance Investigation for Residential Heat Pump System with Different Outdoor Heat Exchanger Designs

“…The effect remains similar even for finned tube heat exchanger with larger fin pitches [6]. On the other hand, Pongsoi et al [7] found an insignificant effect of the number of tube rows at high Reynolds numbers (4000-13,000) for crimped spiral finned tube heat exchangers. Similarly, Tang [8] investigated finned tube heat exchangers having larger tube diameters with different fin configurations (plain fins, slit fins and delta wing vortex generators).…”