Building energy efficiency assessment base on predict-center criterion under diversified conditions

•A prediction model of building energy consumption is designed, which combines Gaussian mixture clustering and LGBM.•The specific normalized adaptive loss function is designed to determine the optimal parameters of LGBM model.•A novel predict-center energy efficiency evaluation criterion EERPC is proposed, the cumulative distribution pattern is analyzed.•The comprehensive energy benchmark evaluation framework, which is based on the above prediction model and EERPC, is proposed. With the rapid expanding of urban economy and population, how to reduce the energy consumption and improve energy efficiency of public buildings has become a key issue for energy conservation and urban development. However, due to the diversity of building usage condition, energy consumption data often has problems with nonlinearity, outliers, and diversity, which greatly reduce the accuracy of energy consumption prediction and energy conservation assessment. To overcome the above drawbacks, a regression prediction model of building energy consumption is designed, which cluster the same type of data characteristics to form a subset of equipment through Gaussian mixture clustering, and design the specific normalized adaptive loss function to determine the optimal control parameters of regression model. Furthermore, a novel predict-center energy efficiency evaluation criterion is proposed, and the cumulative distribution pattern is further statistically analyzed. Finally, the energy benchmark evaluation framework is proposed to determine the energy efficiency evaluation grade. Through comparative experimental analysis, it can be seen that the proposed prediction model can adapt to different types of building data, and have better prediction accuracy and convergence speed. The consistency and robustness of the benchmark evaluation framework and method are optimal.