Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 82, Issue -, Pages 530-536Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2014.11.032
Keywords
Condensation; BPHE; Refrigerant; Heat transfer coefficient; Super-heating; Gravity-dominated; Forced convection condensation
Categories
Funding
- CariVerona Foundation Verona, Italy Ricerca Scientifica e Technologica Sviluppo di innovativi processi a ridotto impatto ambientale per la conservazione e distribuzione a bassa temperatura delle derrate alimentari a salvaguardia della salute
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This paper presents a new computational procedure for refrigerant condensation inside herringbone-type Brazed Plate Heat Exchanger (BPHE). A transition point between gravity controlled and forced convection condensation was found for an equivalent Reynolds number around 1600. At low equivalent Reynolds number (<1600) the heat transfer coefficients are not dependent on mass flux and are well predicted by a simple model based on the Nusselt (1916) equation for vertical surface. For higher equivalent Reynolds number (>1600) the heat transfer coefficients depend on mass flux and condensate drainage is controlled by the combined actions of gravity and vapour shear. A new model was developed for predicting the heat transfer coefficients in the forced convection condensation region. This new model was also applied to super-heated vapour condensation by using the equation of Webb (1998) to account for super-heating effects. The new computational procedure was compared against data from the literature: the mean absolute percentage deviation between experimental and calculated heat transfer coefficients was lower than 16%. (C) 2014 Elsevier Ltd. All rights reserved.
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