| 摘要 |
A heat exchanger for condensing boilers comprises a hollow body through which flue gases pass when in use, within which there is a first plurality of central tubes (2) which are parallel to each other and define a central mixed heat exchange zone and a second plurality of condensation tubes (7) which are parallel to each other and different from the central tubes (2), forming a condensation zone. The cross-sections of the condensation tubes (7) are elongated along a major axis (Y-Y). |
