Construction of Mini Fan Coil Unit

Abstract

A microcontroller-based fancoil unit(FCU) fuzzy controller is designed and implemented in this paper. The controller employs the concept of duty ratio on the electric valve control, which could make full use of the cooling and dehumidifying capacity of the FCU when the valve is off. The traditional control method and itslimitations are analyzed. The hard ware and software design processes are introduced indetail. The experimental results show that the proposed method is more energy efficient compared to thetraditional controlling strategy. Furthermore, a more comfortable room condition could be achieved by the proposed method. The Lorenz curve and the Gina index are introduced in this study and used as indices to depict load features. For a large -scale use in office building, shopping malls, and other buildings, the fan coil unitis investigated in this study. The proposed low-cost FCU fuzzy controller deserves to be widely used in engineering applications.