本发明涉及一种用于第一流体（31）之间进行热交换的热交换器（30,40）的流动通道（41，41“ 61,61' ，71,71”，81,81' ，91，91“）和一 第二流体（33），包括：具有壳体内侧的周边内部的通道（65）（67）的信道套（63，63 '73，73' ，83,83'，93，93' ）; 通道外壳内侧（65）布置成纤维网的数量的内部的（67）（69，79，79”，89，89' ，99），该流动通道1以引导所述第一流体（31）在所述内部（67），设计通流 横向于流动通道轴线（94）的横截面。 为了提供在同一时间的改进的热传递，以确保被提供的范围在1.5mm和6mm之间在如由流体圆周水力直径在可湿性限定的通流横截面的面积的四倍的比率甚至可接受的压力损失和降低的堵塞的风险。 本发明导致了块的热交换器（30，40）具有多个流动通道（41,41“ 61,61' ，71,71”，81,81' ，91，91“）的这种包括， 它们被第一流体（31）穿过并流体连接到流体端口。 本发明导致增压空气系统，排气再循环系统和热交换器的使用。

The invention relates to a flow channel (41, 41 ', 61, 61', 71, 71 ', 81, 81', 91, 91 ') for a heat exchanger (30, 40) for heat exchange between a first fluid (31) and a second fluid (33) comprising: a channel jacket (63, 63 ', 73, 73', 83, 83 ', 93, 93') having a channel of a casing inner side (65) surrounding the interior (67); a number of the interior (67) of the channel casing inner side (65) are arranged webs (69, 79, 79 ', 89, 89', 99), which flow channel 1 to guide the first fluid (31) in the interior (67) designed throughflow having cross-section transverse to a flow channel axis (94). To provide an improved heat transfer at the same time to ensure even acceptable pressure loss and reduced risk of blockage in an as four times the ratio of the area of ​​the through-flow cross-section defined in a wettable by the fluid circumferential hydraulic diameter is provided in a range between 1.5 mm and 6 mm. The invention leads to a heat exchanger (30, 40) of a block with a number of flow channels (41, 41 ', 61, 61', 71, 71 ', 81, 81', 91, 91 ') of this kind comprises, of the first fluid (31) can flow and which are fluidically connected with a fluid port. The invention leads to a charge air system, an exhaust gas recirculation system and a use of the heat exchanger.