| 摘要 |
The heating tube consists of a number of flat sections (1), connected at their ends by welding to vertical manifold tubes (2). There are apertures (4,5) in the joints linking the interior of one tube to another. The flat sections are made with rounded portions (1a,1b) at the top and bottom, with the welded joints made between the manifold tubes and the rounded portions. On one side of the heating wall the rounded portions on the flat sections can form a recess used to contain fixing brackets, while an assembly with two sets of flat tubes and manifolds can have heat-radiating ribs between them.
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