Cooling device

A cooling device comprising:

• a refrigerant flow path provided in a propulsion system of a ship and cooling the propulsion system;
• a refrigerant supply path configured to take seawater or fresh water around the ship as a refrigerant;
• a cleaning flow path configured to take water for cleaning the refrigerant flow path as a cleaning medium;
• a valve configured to switch between the refrigerant supply path and the cleaning flow path;
• an electric pump configured to cause the refrigerant and the cleaning medium to flow through the refrigerant flow path;
• a control unit configured to control operations of the propulsion system and the electric pump;
• and
• a power storage device configured to supply an electric power to the electric pump,
• wherein the control unit executes each of a plurality of operating modes by controlling the valve, the plurality of operating modes including a first operating mode which causes the refrigerant to flow through the refrigerant flow path by driving the electric pump and the propulsion system, and a second operating mode which causes the cleaning medium to flow through the refrigerant flow path by driving the electric pump and stopping the propulsion system,
• the cooling device further comprising:
• a display device controlled by the control unit,
• wherein when the second operating mode is executed, the control unit displays information indicating that the second operating mode is being executed and countdown information about a residual operating time of the second operating mode depending on a residual capacity of the power storage device, on the display device.