Multi-source information fusion based fault diagnosis of ground-source heat pump using Bayesian network
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- 作者：Baoping Cai ; Yonghong Liu ; Qian Fan ; Yunwei Zhang ; Zengkai Liu ; Shilin Yu ; Renjie Ji
- 关键词：Multi-source information fusion ; Ground-source heat pump ; Bayesian network ; Fault diagnosis
- 刊名：Applied Energy
- 出版年：February, 2014
- 年：2014
- 卷：114
- 期：Complete
- 页码：1-9
- 全文大小：3969 K
文摘
In order to increase the diagnostic accuracy of ground-source heat pump (GSHP) system, especially for multiple-simultaneous faults, the paper proposes a multi-source information fusion based fault diagnosis methodology by using Bayesian network, due to the fact that it is considered to be one of the most useful models in the filed of probabilistic knowledge representation and reasoning, and can deal with the uncertainty problem of fault diagnosis well. The Bayesian networks based on sensor data and observed information of human being are established, respectively. Each Bayesian network consists of two layers: fault layer and fault symptom layer. The Bayesian network structure is established according to the cause and effect sequence of faults and symptoms, and the parameters are studied by using Noisy-OR and Noisy-MAX model. The entire fault diagnosis model is established by combining the two proposed Bayesian networks. Six fault diagnosis cases of GSHP system are studied, and the results show that the fault diagnosis model using evidences from only sensor data is accurate for single fault, while it is not accurate enough for multiple-simultaneous faults. By adding the observed information as evidences, the probability of fault present for single fault of 鈥淩efrigerant overcharge鈥?increases to 100% from 99.69%, and the probabilities of fault present for multiple-simultaneous faults of 鈥淣on-condensable gas鈥?and 鈥淓xpansion valve port largen鈥?increases to almost 100% from 61.1% and 52.3%, respectively. In addition, the observed information can correct the wrong fault diagnostic results, such as 鈥淓vaporator fouling鈥? Therefore, the multi-source information fusion based fault diagnosis model using Bayesian network can increase the fault diagnostic accuracy greatly.