根据本发明的热交换器用于通过冷却流来冷却发动机的燃料。 它包括用于使待冷却的燃料通过的主流管线（11）和用于通过冷却流的旁通管线（12）。 旁路线从主电源线分支出来。 根据本发明的供电系统（20），用于发动机与包括罐（21），一个输送管路系统中的燃料（22A，22B），并根据本发明的（10，10“）的一个或多个热交换器包括，根据前述权利要求中的一个。 根据本发明的方法包括：将燃料引入一个热交换器（10，10“）的主流动管线（11），一个分支从热交换器的旁通管路（12）的主电源线的冷却流，从而降低在所述旁路管线的冷却流的温度和 利用旁路流管线中的冷却流来冷却主流管线的至少一部分（11b）。

An inventive heat exchanger is a cooling of the fuel for an engine by means of a cooling stream. It comprises a main flow line (11) for passing the fuel to be cooled and a by-pass line (12) for passing the cooling flow. The branch line branches off here on the main power line. An inventive supply system (20) for an engine with a fuel comprising a tank (21), a delivery line system (22a, 22b) and one or more heat exchangers according to the invention (10, 10 ') comprises, according to one of the preceding claims. An inventive method includes introducing fuel into a main flow line (11) of a heat exchanger (10, 10 '), a branching a cooling flow from the main power line in a bypass line (12) of the heat exchanger, lowering a temperature of the cooling flow in the bypass line and cooling at least a portion (11b) of the main flow line with the cooling flow in the bypass pipe.