Abstract
This paper presents a new method for predicting evaporating and condensing heat transfer coefficients for refrigerants flowing inside a new type herringbone heat transfer tube which is developed for the use of an air-conditioning machine. Not until recently has there been sufficient quantitative explanation about the heat transfer enhancement mechanism of this tube, the present prediction assumes that the heat transfer coefficient is simply governed by the circumferential local thickness of an unique liquid film layer formed inside the tube. The developed semi-empirical prediction method agrees with the experimental data within the deviation of 30% for both evaporation and condensation.
