{"title":"An optimization-oriented modeling approach using input convex neural networks and its application on optimal chiller loading","authors":"","doi":"10.1007/s12273-023-1093-2","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>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.</p>","PeriodicalId":49226,"journal":{"name":"Building Simulation","volume":"20 1","pages":""},"PeriodicalIF":6.1000,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Building Simulation","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s12273-023-1093-2","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
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.
期刊介绍：
Building Simulation: An International Journal publishes original, high quality, peer-reviewed research papers and review articles dealing with modeling and simulation of buildings including their systems. The goal is to promote the field of building science and technology to such a level that modeling will eventually be used in every aspect of building construction as a routine instead of an exception. Of particular interest are papers that reflect recent developments and applications of modeling tools and their impact on advances of building science and technology.
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