| 摘要 |
<p>A heat-exchanger co-planar with parallel flat-sided pipes connected, at a distance inwardly of their ends, to manifolds for the supply and return flow of a fluid medium. The flat pipes have very small internal clear widths and the ratio of the internal cross-sectional area to the outer circumferential length of each pipe is less than or equal to 2.5. When the heat-exchanger serves as a heater body, the heating medium flows with correspondingly greater velocity through the flat-sided pipes because of the relatively small pipe cross-section. From this, there results a smaller thermal inertia and a better heat transfer for the heat-exchanger. The flat pipes are closed at their inwardly bent ends by means of a welding seam. Outwardly pressed wall regions of the manifold surround bores therein and are connected by welding with corresponding wall regions of the flat pipe, the welding taking place from the inside of the manifold. The manifold consists of at least two parts which are secured together into a rectangular-section manifold by means of welding seams running along the length of the manifold.</p> |
