| 摘要 |
<p>The metal heating pipe is for use in a greenhouse, accommodating a circulating medium, preferably a liquid. The pipe comprises a tubular portion (6) through which the medium flows, and one or more wings (7) running in the lengthwise direction, being formed by extrusion of aluminium or aluminium alloy. There can be two such wings, joining onto the pipe in the radial direction and extending in a vertical plane, one being wider than the other, while the surfaces of both can be corrugated.</p> |
