|発明の名称||HEAT EXCHANGER HAVING INTERMEDIATE HEAT MEDIUM|
PROBLEM TO BE SOLVED: To provide a heat exchanger having an intermediate heat medium capable of extremely reducing a possibility of contacting a high-temperature heating medium (sodium) with a low-temperature heating medium (water) compared with a conventional heat exchanger, which is formed of a double-pipe structure of an outer pipe and an inner pipe and fills the intermediate medium between the both pipes as heat transfer pipes, having a simple structure and reducing the manufacturing cost compared with the double-pipe structure, and simply and swiftly detecting and identifying the damaged outer pipe and inner pipe.
SOLUTION: Multiple inner pipes 2 circulating the low-temperature heat medium Y are disposed in a trunk 1 of the heat exchanger circulating the high-temperature heating medium X, the inner pipes are grouped into multiple groups for every multiple pipes, the multiple inner pipes constituting a single group are disposed in an outer pipe 3, and the intermediate heating medium Z being chemically inactive to the both of the high-temperature heating medium and the low-temperature heating medium and having superior heat transfer performance is made to circulate in each outer pipe 3. A leakage detector capable of detecting the high-temperate heating medium or the low-temperature heating medium leaked into the intermediate heat medium, which flows out from the outer pipe, for each outer pipe is provided so as to swiftly detect and identify the damage for every inner pipe group.
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