| 摘要 |
The characteristics of a gas-liquid heat exchanger are described, for particular use in the production of hot or superheated water by means of the exhaust gases emitted through the chimneys of a thermal treatment furnace, comprising an internal tubular element, for the passage of the gases, surrounded by an external tubular element which defines an annular chamber through which a liquid flows in counter-current to the flow of the gases in the internal tubular element. The latter is provided on its external surface and on its internal surface with radial fins, angularly equidistant from each other, extending axially for a substantial portion of the length of the internal tubular element. The height of each radial fin decreases linearly, both on the side exposed to the gas, and on the side exposed to the liquid, in the opposite direction to that of the flow of the fluid intended to come into contact with the fin, so as to enhance the heat exchange, while the same time avoiding damage through overheating of the said fin and of the wall of the internal tubular element.
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