Experimental characterization of thermal hydraulic performance of louvered brazed plate fin heat exchangers

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Turizo-Santos, J, Barros-Ballesteros, O, Fontalvo-Lascano, A, Vansquez Padillo, R & bula-Silvera, A 2015, 'Experimental characterization of thermal hydraulic performance of louvered brazed plate fin heat exchangers', Revista Facultad de Ingeniería Universidad de Antioquia, no. 74.

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Louvered fins are commonly used in compact heat exchangers to increase the surface area, turbulence, and initiate new boundary layer growth required to improve the heat transfer performance without a significant increase in pressure drop compared with other fins. An experimental study on the air side heat transfer and pressure drop characteristics for a louvered fin with symmetrical patterns in brazed plate heat exchangers had been performed. Reynolds numbers ranged from 350 - 1270, based on the louver pitch while a constant 1.82 m3/h water flow was held. The heat transfer and pressure drop for the geometry tested was reported in terms of Colburn factor (j) and Fanning friction factor (f) as a function of the Reynolds number. The experimental results for j and f are in good agreement compared to regression models suggested for compact heat exchanger with louvered fin and flat tubes, obtaining a deviation of 5.48% and 5.39% respectively. Moreover, when compared to CFD analysis for the same geometry, an average deviation of 6.3% is obtained. Finally a regression model for j and f factors was attained based on the Reynolds number, presenting a deviation of 1.51% and 2.19% respectively.