Fault diagnosis for actuators of an intensified multifunctional heat-exchanger from the view of both plant and component levels

This paper proposes a fault detection and diagnosis (FDD) approach to the nonlinear model of the intensified heat exchanger system locally and globally. It implements the optimal performances monitoring on both internal dynamics of each component and the global system. FDD of the actuator is triggered once faults occur. The recognition of cause and effect relationship between unexpected temperature behaviour and internal variables of the faulty control valves are investigated. Simulations are considered to confirm the effectiveness of the proposed strategy.