The invention relates to the field of intelligent operation and maintenance and energy efficiency management, and discloses a central air-conditioning
system energy efficiency diagnosis method and device based on a large
language model.The method effectively reduces the number of redundant rules and improves the physical rationality and calculation efficiency of the rules by constructing a variable graph of the
system and conducting association
rule mining under the constraint of the graph; the method does not need manual
data annotation, can automatically discover energy efficiency abnormity under an unsupervised condition, is suitable for scenes lacking labels in practical application, and has stronger generalization ability; thirdly, a large
language model is introduced, and automatic classification and causal interpretation are performed on candidate rules, so that the understandability of a diagnosis result is enhanced, and operation and maintenance personnel can conveniently and quickly position problems; the method can be applied to energy-saving operation and fault early warning of the central air-conditioning
system, and helps to identify problems of operation abnormity, design deviation, equipment performance degradation and the like, so that
energy consumption and operation and maintenance cost are reduced, and reliability and efficiency of system operation are improved.