Presents the behaviour of forced convective condensation and boiling inside horizontal enhanced surface tubing of two ternary refrigerant blends proposed as R12 substitutes. Proposes correlations to predict heat transfer characteristics, such as average heat transfer coefficients, as well as pressure drops of newly proposed ternary refrigerant blends inside enhanced surface tubing.

KEYWORDS: Heat flow, refrigerants, R22, R152a, R114, R124, mixtures, convection, condensation, calculating, pressure drop, tubes, non azeotropic