FUEL CELL COOLING SYSTEM AND FUEL CELL TEMPERATURE CONTROL METHOD

A fuel cell cooling system for a refrigerated vehicle has a first heat exchanger, a second heat exchanger, a coolant pump assembly, a solenoid valve module, and a control unit. The first heat exchanger and the second heat exchanger respectively exchange heat with air outside the refrigerated vehicle and air inside a refrigerated container. The coolant pump assembly allows a coolant to flow circularly. The solenoid valve module is electrically connected to the control unit. A fuel cell temperature control method is carried out by the control unit and has the following steps: receiving a power output adjusting data of the fuel cell system, computing an estimated temperature of the coolant according to the power output adjusting data, and determining whether the estimated temperature is within the temperature target range to control the solenoid valve module for controlling the operating temperature of the fuel cell system.