The available modelling data shortage issue makes it difficult to guarantee the performance of data-driven building energy prediction(BEP)models for both the newly built buildings and existing information-poor buildin...The available modelling data shortage issue makes it difficult to guarantee the performance of data-driven building energy prediction(BEP)models for both the newly built buildings and existing information-poor buildings.Both knowledge transfer learning(KTL)and data incremental learning(DIL)can address the data shortage issue of such buildings.For new building scenarios with continuous data accumulation,the performance of BEP models has not been fully investigated considering the data accumulation dynamics.DIL,which can learn dynamic features from accumulated data adapting to the developing trend of new building time-series data and extend BEP model's knowledge,has been rarely studied.Previous studies have shown that the performance of KTL models trained with fixed data can be further improved in scenarios with dynamically changing data.Hence,this study proposes an improved transfer learning cross-BEP strategy continuously updated using the coarse data incremental(CDI)manner.The hybrid KTL-DIL strategy(LSTM-DANN-CDI)uses domain adversarial neural network(DANN)for KLT and long short-term memory(LSTM)as the Baseline BEP model.Performance evaluation is conducted to systematically qualify the effectiveness and applicability of KTL and improved KTL-DIL.Real-world data from six-type 36 buildings of six types are adopted to evaluate the performance of KTL and KTL-DIL in data-driven BEP tasks considering factors like the model increment time interval,the available target and source building data volumes.Compared with LSTM,results indicate that KTL(LSTM-DANN)and the proposed KTL-DIL(LSTM-DANN-CDI)can significantly improve the BEP performance for new buildings with limited data.Compared with the pure KTL strategy LSTM-DANN,the improved KTL-DIL strategy LSTM-DANN-CDI has better prediction performance with an average performance improvement ratio of 60%.展开更多
Sensor faults,which are primarily caused by environmental changes,calibration deficiencies,and component aging,critically compromise energy efficiency and operational reliability for building heating,ventilation and a...Sensor faults,which are primarily caused by environmental changes,calibration deficiencies,and component aging,critically compromise energy efficiency and operational reliability for building heating,ventilation and air-conditioning(HVAC)systems.Although conventional data-driven sensor fault calibration methods showed theoretical precision with low variable dependency,their practical implementation still faces challenges:difficulties in maintaining high accuracy and stability during model updates and HVAC system operation varies,insufficient data quantity and quality for effective modeling.To address these challenges,this study proposed a forgetting-adaptive(FA)mechanism based on data incremental learning(DIL),and develops a data selection method by autoencoder(AE)reconstruction to enhance Bayesian inference(BI)calibration models.FA selectively forgets and discards low-contribution data samples via AE reconstruction distance analysis while adaptively integrating high-contribution newly incremental data.Validations were conducted on two case studies:an EnergyPlus-Python simulated Chiller-AHU system and a practical water-cooled chiller system.It was revealed that FA reduced sensor calibration mean absolute error by 20.21%on average compared to the traditional MLR-BI.The impacts of modeling data volume on calibration performance were also explored,FA can maintain calibration accuracy with relatively limited data volumes.Also,this study tried to interpret the FA mechanism in BI model improvement by assessing the modeling data quality using the AE based reconstruction distances and adaptively selecting the high-contribution data via the AEThreshold.展开更多
基金jointly supported by the Opening Fund of Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education of China(Chongqing University)(LLEUTS-202305)the Opening Fund of State Key Laboratory of Green Building in Western China(LSKF202316)+4 种基金the open Foundation of Anhui Province Key Laboratory of Intelligent Building and Building Energy-saving(IBES2022KF11)“The 14th Five-Year Plan”Hubei Provincial advantaged characteristic disciplines(groups)project of Wuhan University of Science and Technology(2023D0504,2023D0501)the National Natural Science Foundation of China(51906181)the 2021 Construction Technology Plan Project of Hubei Province(2021-83)the Science and Technology Project of Guizhou Province:Integrated Support of Guizhou[2023]General 393.
文摘The available modelling data shortage issue makes it difficult to guarantee the performance of data-driven building energy prediction(BEP)models for both the newly built buildings and existing information-poor buildings.Both knowledge transfer learning(KTL)and data incremental learning(DIL)can address the data shortage issue of such buildings.For new building scenarios with continuous data accumulation,the performance of BEP models has not been fully investigated considering the data accumulation dynamics.DIL,which can learn dynamic features from accumulated data adapting to the developing trend of new building time-series data and extend BEP model's knowledge,has been rarely studied.Previous studies have shown that the performance of KTL models trained with fixed data can be further improved in scenarios with dynamically changing data.Hence,this study proposes an improved transfer learning cross-BEP strategy continuously updated using the coarse data incremental(CDI)manner.The hybrid KTL-DIL strategy(LSTM-DANN-CDI)uses domain adversarial neural network(DANN)for KLT and long short-term memory(LSTM)as the Baseline BEP model.Performance evaluation is conducted to systematically qualify the effectiveness and applicability of KTL and improved KTL-DIL.Real-world data from six-type 36 buildings of six types are adopted to evaluate the performance of KTL and KTL-DIL in data-driven BEP tasks considering factors like the model increment time interval,the available target and source building data volumes.Compared with LSTM,results indicate that KTL(LSTM-DANN)and the proposed KTL-DIL(LSTM-DANN-CDI)can significantly improve the BEP performance for new buildings with limited data.Compared with the pure KTL strategy LSTM-DANN,the improved KTL-DIL strategy LSTM-DANN-CDI has better prediction performance with an average performance improvement ratio of 60%.
基金supported by the National Natural Science Foundation of China(51906181)“The 14th Five Year Plan”Hubei Provincial advantaged characteristic disciplines(groups)project of Wuhan University of Science and Technology(2023D0504).
文摘Sensor faults,which are primarily caused by environmental changes,calibration deficiencies,and component aging,critically compromise energy efficiency and operational reliability for building heating,ventilation and air-conditioning(HVAC)systems.Although conventional data-driven sensor fault calibration methods showed theoretical precision with low variable dependency,their practical implementation still faces challenges:difficulties in maintaining high accuracy and stability during model updates and HVAC system operation varies,insufficient data quantity and quality for effective modeling.To address these challenges,this study proposed a forgetting-adaptive(FA)mechanism based on data incremental learning(DIL),and develops a data selection method by autoencoder(AE)reconstruction to enhance Bayesian inference(BI)calibration models.FA selectively forgets and discards low-contribution data samples via AE reconstruction distance analysis while adaptively integrating high-contribution newly incremental data.Validations were conducted on two case studies:an EnergyPlus-Python simulated Chiller-AHU system and a practical water-cooled chiller system.It was revealed that FA reduced sensor calibration mean absolute error by 20.21%on average compared to the traditional MLR-BI.The impacts of modeling data volume on calibration performance were also explored,FA can maintain calibration accuracy with relatively limited data volumes.Also,this study tried to interpret the FA mechanism in BI model improvement by assessing the modeling data quality using the AE based reconstruction distances and adaptively selecting the high-contribution data via the AEThreshold.
