An Extension Theory-Based Fault Diagnosis Method for an Air Source Heat Pump
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Fault diagnosis for air source heat pumps (ASHPs) is essential to maintain system’s operational efficiency and safety. This paper reports a new extension theory-based fault diagnosis method for an ASHP system. An experimental ASHP was set up in environment chambers. Using the experimental ASHP, abnormal operations under five single faults imposed, including compressor valve leakage, reversing valve leakage, condensing airflow faulting, refrigerant liquid line restriction, and refrigerant charge fault, were implemented, and the related fault data obtained. The extension diagnosis method based on the extended correlation function and the matter-element model was then proposed to identify the different fault types. The diagnosis results showed that the proposed fault diagnosis method was able to detect the malfunction types occurring in the experimental ASHP system correctly and promptly.
KeywordsAir source heat pump Matter-element model Fault diagnosis Extension theory
The financial supports for the Natural Science Foundation of Zhejiang Province (Project No. LQ19E060007) are gratefully acknowledged.
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