Condensation heat transfer from the external surface of horizontally pla red wired elliptical tubes was studied both theoretically and experimentally. The numerical solutions for local and average condensation Nusselt numbers Nu () and Nu were presented for a number of the values of parameters

e. A and were compared with classical solutions in a special case (circular smooth tube: e=0

A=0). The general non-dimensional formulae for condensation heat transfer were obtained and the empirical constants and optimum wiring parameters were proposed.