| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact cooler by changing diameters of piping, using a flow rate adjusting valve and utilizing a cooling capacity more effectively. SOLUTION: A plurality of heating parts 1a, 1b, and 1c to be cooled by cooling medium in an electrical apparatus and a plurality of cooling parts 4 for cooling the cooling medium are provided. In addition, piping 6, 7, 8a, and 8c are made to merge each cooling medium cooled at the cooling part and branching the cooling medium into each heating part, and piping 10, 13, and 11 for merging each cooling medium used for cooling each heating part and branching into each cooling part are provided. In this case, each diameters 7a, 7b, 7c, 10a, 10b, and 10c of the piping is made different so as to make the fluid pressure loss uniform among the merged cooling mediums and among the branched cooling mediums for each piping.
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