A master thesis from Aalborg University
Generic Superheat Control of Evaporators using One Sensor and One Actuator
Author(s)
Term
10. term
Publication year
2011
Submitted on
2011-05-27
Pages
137 pages
Abstract
This master thesis deals with generic superheat control of an air conditioning system using one sensor and one actuator. The system is analyzed and a model of the evaporator is derived that extends a conventional evaporator model. The extended model improves the understanding of superheat phenomenon in evaporators, which are unevenly filled. A model based superheat controller, which utilizes all parameter knowledge, is constructed and tested on the test setup. The controller showed positive results, and showed the feasibility of the control structure. The superheat controller was simplified to a generic controller that only measures the output temperature of the evaporator, and does not need knowledge of the system parameters beforehand. The controller was tested on two different test systems and showed positive results on both systems. Feed forward was also included in the controller to help improve the performance of the controller with regard to disturbance rejection.
Keywords
Documents
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