Multi-objective optimization of heat pump drying process using NSGA-II and response surface methodology: a case study of sludge

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-05-07 DOI:10.1016/j.csite.2025.106257

Zhaofan Wu , Yongcun Li , Wentao Zhou , Qiang Fu

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Abstract

Deep drying is essential for the resource utilization of sludge, with the heat pump drying process currently being an energy-saving solution. A heat pump staged drying experimental device is built, and the drying process is set to three stages: low temperature (30 °C), medium temperature (40 °C), and high temperature (50 °C). To achieve multiple objectives of sufficient sludge drying effect, high energy efficiency, and short total drying time, this paper proposes an optimization method combining NSGA-II with response surface methodology. First, the efficacy coefficients of different objectives are determined for standardized evaluation. Then, the response model of each objective is obtained by response surface methodology, and the influence of the duration of each stage on the response is explored. Finally, the optimal process conditions are determined through the optimization of NSGA-II. The durations of the low, medium, and high temperature stages are 2.4897 h, 2.4878 h, and 1.5879 h, respectively. The corresponding energy efficiency score, drying effect, and total drying time are 0.8998, 0.8836, and 6.5654 h, respectively. Compared with constant medium temperature drying, the energy efficiency score increases by 4.3 %, the drying effect increases by 5.4 %, and the total drying time is reduced by 17.9 %.

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基于NSGA-II和响应面法的热泵干燥过程多目标优化：以污泥为例

深度干燥是污泥资源化利用的关键，目前热泵干燥是一种节能的解决方案。搭建热泵分级干燥实验装置，将干燥过程设置为低温（30℃）、中温（40℃）、高温（50℃）三个阶段。为实现污泥干燥效果好、能效高、总干燥时间短的多重目标，本文提出了NSGA-II与响应面法相结合的优化方法。首先，确定不同目标的功效系数，进行标准化评价。然后，利用响应面法得到了各目标的响应模型，并探讨了各阶段持续时间对响应的影响。最后，通过对NSGA-II的优化，确定了最优工艺条件。低温、中温和高温阶段的持续时间分别为2.4897 h、2.4878 h和1.5879 h。相应的能效评分为0.8998 h，干燥效果为0.8836 h，总干燥时间为6.5654 h。与恒温干燥相比，能效评分提高4.3%，干燥效果提高5.4%，总干燥时间缩短17.9%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.