Plate fin heat exchanger

A plate fin heat exchanger configured to perform heat exchange between plural fluids, comprising:

• a heat exchange part main body including alternating layers of flow passages for carrying each of the plural fluids, the heat exchange main body includes partition walls each of which is arranged between each of two adjacent said flow passages respectively, the heat exchange part main body includes at least a first outer side and a second outer side, the second outer side provided on an opposite side of the main body from the first outer side, the flow passages are alternately arranged in an arrangement direction from the first outer side to the second outer side such that an axis of the main body part would extend through each alternating layer of the flow passages;
• a plurality of side bars positioned between each opposed partition wall to thereby connect the opposed partition walls to each other and seal a space between the opposed partition walls;
• heat transfer members each of which is disposed within each of said flow passages of said heat exchange part main body respectively, each of said heat transfer members connecting said partition walls opposed across each of said flow passages to transfer the heat of the fluid flowing in each of said flow passages to said opposed partition walls;
• sensing parts including a first sensing part connected to the first outer side and a second sensing part connected to the second outer side of said heat exchange part main body in series along the arrangement direction of said flow passages, each of said sensing parts includes a plurality of sealed spaces including an outermost sealed space and an innermost sealed space provided immediately adjacent the outermost sealed space, the sealed spaces each being formed by a plurality of the opposed partition walls, one of the plurality of side bars, and one of the heat transfer members so as to seal an entire circumference of the sealed spaces, the sealed spaces being arranged in series along the arrangement direction of said flow passages, and a sensor wall disposed to separate the outermost sealed space from the innermost sealed space on the inner side of said outermost sealed space;
• and
• a detection means connected to each sensing part for detecting damage of said sensor wall,
• wherein the first sensing part is provided adjacent the first outer side, and the second sensing part is provided adjacent the second outer side.