| 摘要 |
The present invention relates to a heat transmission duct particularly for heating systems embedded in a hardened transmission medium. The duct has a particular sectional shape composed of an internal profile constituted by two opposite vertically arranged regions (2,3) connected to two regions (4,5) with marked curvature. The external profile is instead constituted by two vertically arranged opposite regions (6,7) with very low or no curvature which are connected upwardly by a region (8) with very high curvature and downwardly by a region (9,10) with very low or no curvature. Longitudinal fins (12) extend from the vertical external regions and are suitable for improving grip on the hardened medium and heat transmission. <IMAGE> |
