Simulation of duty ratio fuzzy control of fan coil units

Analyses the dynamic heat transfer characteristics of fan coil units in the water cut-off state. Establishes a system simulator to study the duty ratio fuzzy control of fan coils, and studies the influences of quantizing factors K_e, K_ec and control cycle τCYC on the control effect. The results show that on the assumption of ensuring the control effect of room temperature, 18% of comprehensive energy consumption of a fan coil unit can be decreased by optimizing τCYC, which has the greatest impact on the control effect; K_e followed, 16% decreased; K_ec, 8% decreased. For the office buildings studied, τCYC should be 1.2 times of the air temperature rising time of the fan coil unit in the water cut-off state in low speed operation.