Optimized control of air-conditioning process with recycle

The paper presents hierarchical control system of air-conditioning process with recycle. Technological demands require changes of the operating points which are realized by the upper control layer. Operating points are optimized using grey box model of the process: one part of the model is formulated as first principle model while the second is identified as the mathematical model. Dedicated optimization algorithm is derived and described in the paper. Direct (lower) control layer uses gain-scheduled PID controllers. This hierarchical control system has been tested on a pilot air-conditioning process which is aimed to verify real-world installation of air-conditioning for the hall where creep testing of metals is performed.