Generic visual data mining-based framework for revealing abnormal operation patterns in building energy systems

The abnormal operation patterns in building energy systems can be revealed by analyzing their historical operational data. In practice, the amount of data is so tremendous that manual data analysis is challenging. Visual data mining is a promising solution to this problem. This study proposes a generic visual data miningbased framework for extracting abnormal operation patterns in building energy systems from their historical operational data. The framework consists of three steps. First, a kernel density estimation-based approach is utilized to preprocess the raw data. Then, a decision tree-based approach is adopted to identify the system operation conditions. Finally, a maximal frequent subgraph mining-based approach is developed to reveal the system operation patterns. The framework is applied to analyze the one-year operational data of a chiller plant. This study proves that the framework can appropriately interpret the data mining results, and can make the analysis of the results more convenient.