Abstract
The air-side thermal-hydraulic performance of multi-louvered aluminium fin heat exchangers is investigated. A systematic numerical study has been performed to analyze the air-sde thermal hydraulic characteristics over a wide range of Reynolds number i.e., from 30 to 500. Air-side heat transfer coefficient and pressure drop were calculated and validated over the mentioned band of Reynolds numbers. The critical Reynolds number was determined numerically; and also the variation of flow pattern along with the air-side heat transfer coefficient and pressure drop in a multi-louvered heat exchanger associated with R e c r i has been reported. Moreover, a parametric study of the multi-louvered aluminium fin heat exchangers was also performed for 36 heat exchanger configurations with the louver angles (19–31°); fin pitches (1.0, 1.2, 1.4 mm) and flow depths (16, 20, 24 mm); and the geometric configuration exhibiting the highest air-side heat transfer coefficient was reported. The air-side heat transfer coefficient and pressure drop results for different geometrical configurations were presented in terms of Colburn j factor and Fanning friction factor f; as a function of Reynolds number based on louver pitch.
Highlights
Fin and tube heat exchangers have been widely used throughout the world as condensers and evaporators for refrigeration and air conditioning applications
In the forced heat transfer, air-side thermal resistance is the key factor; the air-side thermal hydraulic performance of multi-louvered fin and flat tube heat exchangers depends on the louvered fin geometry such as fin and louver pitches, louver angle, and flow depth
The present study numerically investigates the thermal hydraulic performance of multi-louvered fin and flat tube heat exchangers using 36 heat exchanger models with different louver angles (19–31◦ ), flow depths (16, 20, 24 mm) and 1.21 ≤ Lp /Fp ≤ 1.70 over a Reynolds number range of 30 to 500
Summary
Fin and tube heat exchangers have been widely used throughout the world as condensers and evaporators for refrigeration and air conditioning applications. Air-side heat transfer and pressure drop data were reported for all 26 samples in terms of j and f factors and were compared They proposed two correlations for low (20 < Re ≤ 80) and high range (80 < Re ≤ 200) of Reynolds number for both j and f factors based on their experimental data. The present study numerically investigates the thermal hydraulic performance of multi-louvered fin and flat tube heat exchangers using 36 heat exchanger models with different louver angles (19–31◦ ), flow depths (16, 20, 24 mm) and 1.21 ≤ Lp /Fp ≤ 1.70 over a Reynolds number range of 30 to 500. The heat transfer coefficient and pressure drop data for heat exchangers with different geometrical configurations are reported in terms of the Colburn j factor and Fanning friction factor f, as a function of Reynolds number based on the louver pitch. Critical Reynolds number was determined numerically, and the variation in flow pattern along with the thermal and hydraulic performance of microchannel heat exchanger associated with Recri has been reported
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