| 摘要 |
PROBLEM TO BE SOLVED: To provide a reliable cooling device that, when brine with an additive for decreasing a freezing point mixed therein is used as a cooled fluid, can manage the concentration of the additive in the cooled fluid without using a measuring instrument such as a concentration meter, and is capable of preventing freezing of the cooled fluid due to a decrease in the concentration.SOLUTION: A cooling device 100 includes an operation information detection means for detecting operation information of the cooling device 100; and a cooled fluid concentration detection means (concentration determination part 101) for calculating a physical property of the cooled fluid on the basis of the operation information from the operation information detection means to detect a state of the concentration of the cooled fluid on the basis of the calculated value. |
