Fault diagnosis of VRF air-conditioning system based on improved Gaussian mixture model with PCA approach
Autor: | Yabin Guo, Huanxin Chen |
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Rok vydání: | 2020 |
Předmět: |
Computer science
business.industry 020209 energy Mechanical Engineering Variable refrigerant flow 0211 other engineering and technologies 02 engineering and technology Building and Construction Mixture model Fault (power engineering) Reversing valve Refrigerant Control theory Air conditioning 021105 building & construction Principal component analysis HVAC 0202 electrical engineering electronic engineering information engineering business |
Zdroj: | International Journal of Refrigeration. 118:1-11 |
ISSN: | 0140-7007 |
Popis: | 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. |
Databáze: | OpenAIRE |
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