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Real-time configuration-switching control strategy optimization of four-bed adsorption-based power and cooling cogeneration system

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  • Zhao, Yanan
  • Li, Mingliang
  • Long, Rui
  • Liu, Zhichun
  • Liu, Wei

Abstract

Previous efforts regarding adsorption-based osmotic heat engines (ADOHE) are focused on two adsorption bed configurations and no literatures have been reported on ADOHEs with multi-bed configurations as well as principles for system configuration adjustment under different operating conditions. In this study, a four-bed adsorption-based regeneration is applied to the osmotic heat engine to upgrade the power generation and refrigeration performance. Cascade and parallel configurations distinguished by the thermal energy utilization models are presented. Performance indicators of heat recovery rate and exergy efficiency are employed for evaluating the system capability to utilize low-temperature waste heat. Results reveal that compared to the parallel configuration, cascade configuration exhibits lower work extracted, cooling capacity output and coefficient of performance (COP), while higher electrical efficiency, energy recovery rate and exergy efficiency. In addition, the cascade configuration effectively reduces the refrigerant outlet temperature fluctuations, thus improving the quality of cooling capacity. To demonstrate the practical application potential, configuration-switching control strategy optimization under real-time heat source with varying temperatures and flow rates is carried out via machine learning and genetic algorithms. The cascade configuration is preferred for higher temperature heat sources, while parallel configuration is preferred for lower temperature heat sources. The maximum electrical efficiency and COP of 0.27 % and 0.85 are obtained under the optimal configuration-switching control strategies. Compared to the parallel and cascade configurations, electrical efficiencies are improved by 5.95 % and 4.98 %, while the COPs are improved by 3.99 % and 4.84 %, respectively. This study may offer rational and potential guidance for designing and operating upgraded adsorption-based osmotic heat engines.

Suggested Citation

  • Zhao, Yanan & Li, Mingliang & Long, Rui & Liu, Zhichun & Liu, Wei, 2025. "Real-time configuration-switching control strategy optimization of four-bed adsorption-based power and cooling cogeneration system," Energy, Elsevier, vol. 320(C).
    • Handle: RePEc:eee:energy:v:320:y:2025:i:c:s0360544225010229
    DOI: 10.1016/j.energy.2025.135380
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