Condensation du NH₃ / H₂O avec des concentrations massiques entre 80% et 96%: étude expérimentale dans un échangeur de chaleur à plaque

High concentration NH₃/H₂O is suitable for Kalina cycles used for the recovery of low grade heat. Plate heat exchangers (PHEs) are compact and reduce the charge of working fluid. This paper investigates the condensation of NH₃/H₂O with NH₃ mass concentrations of 80%-96%. The vapor and...

NH₃ condensation in a plate heat exchanger: Experimental investigation on flow patterns, heat transfer and frictional pressure drop

This paper investigates NH₃ condensation in a plate heat exchanger by visualizing the flow patterns and measuring heat transfer coefficients and frictional pressure drop. Visualization experiments were conducted between 20 and 100 kgm⁻²s⁻¹. Full film flow takes place at large mass fluxes and intermediate mass...

Heat transfer and frictional pressure drop during condensation in plate heat exchangers: Assessment of correlations and a new method

The corrugation channels of plate heat exchangers enhance the heat transfer and complicate the prediction of heat transfer coefficients and frictional pressure drop. This paper reviews the heat transfer and frictional pressure drop correlations for condensation in plate heat exchangers, and classifies the correlations into basic forms. An...