Mixed hydraulic fluid cooling device and a cooling device for an electronic device with

Attached to the heating element, and sends the heat receiver taking heat from the heating element by the refrigerant, a heat exchanger which releases lower the coolant temperature from the inflow refrigerant dissipates heat, the refrigerant in the heat exchanger from the heat receiver flowing a first flow passage, a cooling device and a pump for moving the second flow path and refrigerant sending coolant to the heat receiver from heat exchanger, as a refrigerant, the impure liquid containing pure water or nanoparticles ethanol mixed working fluid mixture hydraulic fluid used was used with an alcohol concentration of 5% by weight ethanol 0.1% by weight in addition, a cooling device with improved freezing tolerance.