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Conventional fault detection and diagnosis in water chillers needs water flow measurements to calculate system load. However, the measurement of water flow meters usually fluctuates greatly, and high accuracy flow meters are very expensive. In this paper, a novel modelling method using a new reference model for fault detection and diagnosis in water chillers was developed, and the real evaporator water flow rate was replaced by a pseudo evaporator water flow rate that was equal to the designed evaporator water flow rate or the average evaporator flow rate under stable operation conditions. The newdeveloped reference model was validated by the data sets from ASHRAE 1043-RP. The validation results showed that the new developed reference model has good prediction accuracy and clear diagnosis rules, which can be used for fault detection and diagnosis in water chillers in the absence of water flow measurements. Keywords-fault detection and diagnosis; water chiller; reference model

A Novel Modelling Method for Fault Detection and Diagnosis in Large Water Chillers without Water Flow Measurements