Heat exchanger

A heat exchanger that cools a cooled object by heat exchange between the cooled object and a liquid coolant, the heat exchanger comprising:

• a heat exchanger body that includes a circulation path through which the coolant is circulated and performs heat exchange between the coolant flowing through the circulation path and the cooled object;
• a coolant supply pump that supplies the coolant to the heat exchanger body;
• an accumulation determination unit that determines whether a foreign matter accumulation condition is fulfilled that is satisfied when foreign matter is determined to be accumulated in at least a part of the circulation path;
• and
• a process execution unit that in response to the foreign matter accumulation condition being satisfied, executes a foreign matter cleaning process of removing the foreign matter accumulated in the circulation path and cleaning the circulation path, wherein
• in the foreign matter cleaning process, the process execution unit reduces an amount of coolant supplied from the coolant supply pump so that the coolant has a superheating degree in a nucleate boiling region.