Fuzzy PID Control Applied in Evaporator of Organic Rankine Cycle System

In the process of production, it is showed that 60% to 65% of energy would be transformed into waste heat and be lost. Fortunately, organic Rankine cycle power generation technology can solve this problem. The evaporator is a key part of the machine, where the working fluid R245fa is heated by residual heat into steam with high temperature and high pressure. For the whole process, the proper temperature of steam is necessary. Therefore, the mechanism analysis method is adopted in the modeling. Besides, the evaporator outlet temperature is controlled by the fuzzy PID controller to keep the suitable temperature. Simulink environment of the Matlab software is applied in this system to study the dynamic characteristics of the object to adapt to parameter changes and anti-interference of control object. It is showed that in terms of temperature controlling, fuzzy PID control performs better than single PID control and fuzzy control.