An optimization-oriented modeling approach using input convex neural networks and its application on optimal chiller loading

Optimization for the multi-chiller system is an indispensable approach for the operation of highly efficient chiller plants. The optima obtained by model-based optimization algorithms are dependent on precise and solvable objective functions. The classical neural networks cannot provide convex input...

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Bibliographic Details
Published in:Building simulation 2024-04, Vol.17 (4), p.639-655
Main Authors: Xing, Shanshuo, Zhang, Jili, Mu, Song
Format: Article
Language:English
Subjects:
Algorithms
Approximation
Atmospheric Protection/Air Quality Control/Air Pollution
Building Construction and Design
Chillers
Convexity
Cooling loads
Datasets
Engineering
Engineering Thermodynamics
Heat and Mass Transfer
Heuristic methods
Monitoring/Environmental Analysis
Neural networks
Numerical methods
Optimization
Research Article
Robustness (mathematics)
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Summary:Optimization for the multi-chiller system is an indispensable approach for the operation of highly efficient chiller plants. The optima obtained by model-based optimization algorithms are dependent on precise and solvable objective functions. The classical neural networks cannot provide convex input-output mappings despite capturing impressive nonlinear fitting capabilities, resulting in a reduction in the robustness of model-based optimization. In this paper, we leverage the input convex neural networks (ICNN) to identify the chiller model to construct a convex mapping between control variables and the objective function, which enables the NN-based OCL as a convex optimization problem and apply it to multi-chiller optimization for optimal chiller loading (OCL). Approximation performances are evaluated through a four-model comparison based on an experimental data set, and the statistical results show that, on the premise of retaining prior convexities, the proposed model depicts excellent approximation power for the data set, especially the unseen data. Finally, the ICNN model is applied to a typical OCL problem for a multi-chiller system and combined with three types of optimization strategies. Compared with conventional and meta-heuristic methods, the numerical results suggest that the gradient-based BFGS algorithm provides better energy-saving ratios facing consecutive cooling load inputs and an impressive convergence speed.
ISSN:1996-3599
1996-8744
DOI:10.1007/s12273-023-1093-2