A New Computational Procedure for Heat Transfer and Pressure Drop During Refrigerant Condensation Insdie Enhanced Tubes

摘要

A new computational procedure for heat transfer coefficent and pressure drop during condensation of pure refrigerants and refrigerant mixtures inside enhanced tubes is presented. A modified form of the Cavallini and Zecchin equaiton (Cavallini and Zecchin, 1971, 1974) for smooth tube has been implemented for condensation inside low-fin, micro-fin and cross-grooved tubes: the comparison with a set of around 300 experimentakl data points, including both pure refrigerants, azeotropic. and zeotropci refrigerant mixtures, shows an absolute mean deviation of around 15/100.