| 摘要 |
A cross-flow heat exchanger (1) comprises two through-flow circuits physically separated from and thermally coupled to each other, which circuits are arranged in interwoven relation and through which flow, in mutual transverse direction, an air flow (14) from an outside air inlet (3) to a discharge (7) to the space for heating, and for instance an inlet (8) for hot flue gases (15) coming from the burner to a discharge (11) for flue gases (15) to the outside, which walls (13) are all substantially congruent and are held in mutual connection, which heat exchanger (1) has a substantially prismatic form. The heat exchanger (1) according to the invention has the feature that in the prismatic form a smaller prismatic part (18) serving as bypass circuit with the same section transversely of the main direction is free of walls and comprises a cavity (18) bounded by two walls (19,20), which cavity (18) forms part of the first through-flow circuit, in which cavity (18) is arranged a valve (21) which is displaceable between a closed position and an open position. <IMAGE> |
