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Performance prediction and operating conditions optimization for aerobic fermentation heat recovery system based on machine learning

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  • He, Wei
  • Cao, Yongna
  • Qin, Jiang
  • Guo, Chao
  • Pei, Zhanjiang
  • Yu, Yanling

Abstract

The low-grade, long-term production characteristics of aerobic fermentation heat (AFH) present challenges in heat recovery, leading to oversight. Clarifying the correlation between the operating conditions and performance of the aerobic fermentation heat recovery system (AFHRS) is crucial for achieving efficient AFH utilization. This study introduced machine learning tools to design and optimize an AFHRS that is suitable for two types of cold sources. A performance prediction model for the AFHRS was established with an average relative error of 3.66 %. The results demonstrate that, higher fermentation temperatures and flow rates exhibit advantageous effects on heat recovery performance. A moderate water flow is suitable for daily heating, providing a higher heat transfer rate (1573 W, 27.4 °C); a lower water flow is suitable for supplying hot water, providing a higher water temperature (898.7 W, 45.5 °C). High air flow shows unique potential in bio-drying, providing hot outdoor air (48.3 °C). In comparison to air (≤18.8 %), water demonstrates satisfactory heat recovery efficiency (49.5 %–82.1 %). However, maintaining optimum operating conditions for an extended duration is impractical. Intermittent heat recovery is a rational approach to align with the AFH production law. We deduced that cascaded heat exchangers can significantly increase AFH utilization efficiency.

Suggested Citation

  • He, Wei & Cao, Yongna & Qin, Jiang & Guo, Chao & Pei, Zhanjiang & Yu, Yanling, 2025. "Performance prediction and operating conditions optimization for aerobic fermentation heat recovery system based on machine learning," Renewable Energy, Elsevier, vol. 239(C).
    • Handle: RePEc:eee:renene:v:239:y:2025:i:c:s0960148124021876
    DOI: 10.1016/j.renene.2024.122119
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