Journal
INTERNATIONAL JOURNAL OF REFRIGERATION
Volume 118, Issue -, Pages 1-11Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2020.06.009
Keywords
Fault diagnosis; Gaussian mixture model; Principal component analysis; Data dimension reduction; Variable refrigerant flow air conditioning system
Categories
Funding
- National Natural Science Foundation of China [51876070, 51576074]
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The timely fault diagnosis of HVAC systems is important for building energy saving, equipment maintenance and indoor comfort. The Gaussian mixture model method has rarely been studied in the fault diagnosis application of HVAC systems. Therefore, a novel fault diagnosis strategy is proposed based on the Gaussian mixture model (GMM) method for the variable refrigerant flow air-conditioning system. To reduce excessive input variables resulting in large model complexity and long running time, the principal component analysis approach (PCA) is used to perform data dimensionality reduction. Therefore, the fault diagnosis model combining the Gaussian mixture model and principal component analysis is established, which is evaluated using the four types of faults of the variable refrigerant flow system. These faults include refrigerant undercharge, refrigerant overcharge, outdoor unit fouling and four-way reversing valve faults. Experiments are carried out under three heating conditions. Results show that the PCA-GMM approach can effectively reduce the running time. Especially for the VVV type model, the running time is reduced from 176.78 s to 15.18 s. Meanwhile, established PCA-GMMs still have good fault diagnosis correct rates when the input data dimension is reduced. Especially, some PCA-GMMs have fault diagnosis correct rates of over 99% when the number of principal components exceeds 7. (C) 2020 Elsevier Ltd and IIR. All rights reserved.
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