Prévention par chauffage de la formation de givre ou de verglas sur les conducteurs cylindriques ou toronnés

Abstract

The power required to prevent rime and glaze formation by Joule heating on a smooth or stranded conductor was investigated. Experiments were conducted in a wind tunnel to determine the effect of wind velocity, temperature and water content on this power. Results show that the minimum power for ice prevention increases for a stranded conductor. At wind velocities at which rime is formed on a conductor, the effect of the conductor strands is due mostly to an increase in the heat transfer area and can be diminished by using a trapezoidal cross-section stranded conductor. For a smooth cylindrical conductor it is shown that the ice prevention power is a function of ambient temperature, air stream velocity, water content, and droplet collection efficiency of the conductor.