Application study on a duty ratio fuzzy control method for fan coil units in the building in Chengdu, China.

This paper presents a novel energy efficiency control method for a fan coil unit, the duty ratio fuzzy control method (DRFCM), which employs the concept of duty ratio on the electric valve control to fully utilize the cooling and dehumidifying capacity of a fan coil unit when the control valve is closed. This paper adopts a FCUs system with a three fan speed controls and an electric water valve on/off control in Chengdu, China. The application results show that DRFCM could obtain at least 10.3% energy savings over the conventional control method. [ABSTRACT FROM AUTHOR]