| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow velocity control method capable of preventing thermal runaway of a heating element by equalizing heat of a heat pipe even when a working fluid is frozen, and further reducing costs.SOLUTION: A flow velocity control device 1 includes a pair of ducts 3, 4 disposed at an upstream side and a downstream side of a cooling device 10, a cover member 5 disposed while making the pair of ducts communicate with each other, and covering the cooling device 10, a fan 6 for distributing a cooling fluid to the duct 3 at the upstream side, a temperature sensor 7 mounted on the duct 4 at the downstream side, and detecting a temperature of the cooling fluid at the downstream side of the cooling device 10, and a control section 8 controlling a flow velocity of the cooling fluid on the basis of an output from the temperature sensor 7. In the duct 4, a temperature of a position corresponding to the approximate center in the width direction of a radiation fin 41 and a position corresponding to a height of an upper end of the heat pipe 30, is detected, and electric power supplied to the fan 6 is increased to keep a wind velocity in the duct at a second wind velocity, when a detected temperature is higher than a threshold value A. |
