Integrated system and control method for achieving heat exchange and power generation through liquid nitrogen

The invention discloses an integrated system and control method for achieving heat exchange and power generation through liquid nitrogen. According to the system, an electronic control unit (ECU) controls a liquid nitrogen pump and solenoid valves to act to guide refrigerating fluid into a heat exchange box. Heat exchange fluid or gas or liquid in need releases heat to the liquid nitrogen in a heat exchange pipe, so that the cooling purpose is achieved; and meanwhile, power generation is further conducted through heated and expanded nitrogen gas, so that energy recycling is achieved. The solenoid valves are controlled to act through the electronic control unit (ECU), and the temperature of the heat exchange fluid or gas or liquid can be controlled to be at a set value, so that intelligentadjustment of the temperature is achieved. The integrated system is simple in structure, low in cost and convenient to maintain and can be applied to equipment high in thermal load and heat exchange requirement, such as an engine, so that rapid cooling is achieved.