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Exergy transfer analysis of microwave heating systems

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  • Acevedo, Luis
  • Usón, Sergio
  • Uche, Javier

Abstract

Exergy transfer analysis is proposed as a complementary method for analyzing and better understanding of the efficiency of microwave heating systems, which play a key role in medicine, chemical engineering, food industry and material processing. Since this method is able to detect and quantify in detail where irreversibilities occur, it can be a useful first step in the improvement of microwave systems. First, the different approaches for modeling microwave systems and interactions wave-thermal system are reviewed. Then, relation between Poynting vector, energy and exergy in microwaves is analyzed in depth. Afterwards, a 2-D model of energy and exergy transfer for a microwave heating system is presented. The model is based on Lambert's Law and is applied for the analysis of a potato heating. A comparison with a conventional heating is also presented, where the irreversibility evolution of both process, microwave and conventional, is analyzed with the presented methodology, presenting advantages and disadvantages for each process. This simple example proposed for illustration demonstrates how the analysis of exergy transfer results allows one not only to characterize the global exergy efficiency of the system but also analyze in depth the time and space distribution of exergy flows, exergy variation and irreversibility.

Suggested Citation

  • Acevedo, Luis & Usón, Sergio & Uche, Javier, 2014. "Exergy transfer analysis of microwave heating systems," Energy, Elsevier, vol. 68(C), pages 349-363.
    • Handle: RePEc:eee:energy:v:68:y:2014:i:c:p:349-363
    DOI: 10.1016/j.energy.2014.02.041
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    References listed on IDEAS

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    Cited by:

    1. Huang, Xing & Hong, Jiarong & Zhang, Yaning & Shuai, Yong & Yuan, Yuan & Li, Bingxi & Tan, Heping, 2017. "Exergy distribution characteristics of solar-thermal dissociation of NiFe2O4 in a solar reactor," Energy, Elsevier, vol. 123(C), pages 131-138.
    2. Papasidero, Davide & Pierucci, Sauro & Manenti, Flavio, 2016. "Energy optimization of bread baking process undergoing quality constraints," Energy, Elsevier, vol. 116(P2), pages 1417-1422.
    3. Acevedo, Luis & Usón, Sergio & Uche, Javier, 2015. "Local exergy cost analysis of microwave heating systems," Energy, Elsevier, vol. 80(C), pages 437-451.
    4. Falciglia, Pietro P. & Roccaro, Paolo & Bonanno, Lorenzo & De Guidi, Guido & Vagliasindi, Federico G.A. & Romano, Stefano, 2018. "A review on the microwave heating as a sustainable technique for environmental remediation/detoxification applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 95(C), pages 147-170.
    5. Liu, Yongxin & Yue, Xuejun & Cai, Kun & Deng, Haidong & Zhang, Ming, 2015. "Microwave-assist hydrothermal synthesis and luminescence of NaGd(WO4):Tb3+ phosphors: A case study for the energy saving in the synthesis of phosphors," Energy, Elsevier, vol. 93(P2), pages 1413-1417.

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