The heat transfer of enhanced vapor condensation over the surface of an elliptical pipe has been studied theoretically and experimentally. An equation of dimensionless parameters for the condensation of vapor in a static saturated state was derived

and the effects of some major parameters on the heat transfer coefficient of vapor condensation were analyzed and discussed. The heat transfer coefficients over the surface of elliptical pipes with the same perimeter but with different ratios of major and minor axes were measured experimentally to yield some experimental curves. The theoretical analysis was in good agreement with experimental results. The heat transfer of vapor condensation over an elliptical pipe was greater than that over a circular pipe.