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Modeling the exergy behavior of human body

Author

Listed:
  • Keutenedjian Mady, Carlos Eduardo
  • Silva Ferreira, Maurício
  • Itizo Yanagihara, Jurandir
  • Hilário Nascimento Saldiva, Paulo
  • de Oliveira Junior, Silvio

Abstract

Exergy analysis is applied to assess the energy conversion processes that take place in the human body, aiming at developing indicators of health and performance based on the concepts of exergy destroyed rate and exergy efficiency. The thermal behavior of the human body is simulated by a model composed of 15 cylinders with elliptical cross section representing: head, neck, trunk, arms, forearms, hands, thighs, legs, and feet. For each, a combination of tissues is considered. The energy equation is solved for each cylinder, being possible to obtain transitory response from the body due to a variation in environmental conditions. With this model, it is possible to obtain heat and mass flow rates to the environment due to radiation, convection, evaporation and respiration. The exergy balances provide the exergy variation due to heat and mass exchange over the body, and the exergy variation over time for each compartments tissue and blood, the sum of which leads to the total variation of the body. Results indicate that exergy destroyed and exergy efficiency decrease over lifespan and the human body is more efficient and destroys less exergy in lower relative humidities and higher temperatures.

Suggested Citation

  • Keutenedjian Mady, Carlos Eduardo & Silva Ferreira, Maurício & Itizo Yanagihara, Jurandir & Hilário Nascimento Saldiva, Paulo & de Oliveira Junior, Silvio, 2012. "Modeling the exergy behavior of human body," Energy, Elsevier, vol. 45(1), pages 546-553.
    • Handle: RePEc:eee:energy:v:45:y:2012:i:1:p:546-553
    DOI: 10.1016/j.energy.2012.02.064
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    References listed on IDEAS

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    1. Prek, Matjaz, 2006. "Thermodynamical analysis of human thermal comfort," Energy, Elsevier, vol. 31(5), pages 732-743.
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    Cited by:

    1. Genc, S. & Sorguven, E. & Ozilgen, M. & Aksan Kurnaz, I., 2013. "Unsteady exergy destruction of the neuron under dynamic stress conditions," Energy, Elsevier, vol. 59(C), pages 422-431.
    2. Mateja Dovjak & Masanori Shukuya & Aleš Krainer, 2018. "User-Centred Healing-Oriented Conditions in the Design of Hospital Environments," IJERPH, MDPI, vol. 15(10), pages 1-28, September.
    3. Mady, Carlos Eduardo Keutenedjian & Henriques, Izabela Batista & de Oliveira, Silvio, 2015. "A thermodynamic assessment of therapeutic hypothermia techniques," Energy, Elsevier, vol. 85(C), pages 392-402.
    4. Henriques, Izabela Batista & Mady, Carlos Eduardo Keutenedjian & de Oliveira Junior, Silvio, 2016. "Exergy model of the human heart," Energy, Elsevier, vol. 117(P2), pages 612-619.
    5. Guo, Hongshan & Luo, Yongqiang & Meggers, Forrest & Simonetti, Marco, 2019. "Human body exergy consumption models’ evaluation and their sensitivities towards different environmental conditions," Energy, Elsevier, vol. 183(C), pages 1075-1088.
    6. Küçük, Kübra & Tevatia, Rahul & Sorgüven, Esra & Demirel, Yaşar & Özilgen, Mustafa, 2015. "Bioenergetics of growth and lipid production in Chlamydomonas reinhardtii," Energy, Elsevier, vol. 83(C), pages 503-510.
    7. Henriques, Izabela Batista & Mady, Carlos Eduardo Keutenedjian & de Oliveira Junior, Silvio, 2017. "Assessment of thermal comfort conditions during physical exercise by means of exergy analysis," Energy, Elsevier, vol. 128(C), pages 609-617.
    8. Flórez-Orrego, Daniel & Henriques, Izabela B. & Nguyen, Tuong-Van & Mendes da Silva, Julio A. & Keutenedjian Mady, Carlos E. & Pellegrini, Luiz Felipe & Gandolfi, Ricardo & Velasquez, Hector I. & Burb, 2018. "The contributions of Prof. Jan Szargut to the exergy and environmental assessment of complex energy systems," Energy, Elsevier, vol. 161(C), pages 482-492.
    9. Prek, Matjaž & Butala, Vincenc, 2017. "Comparison between Fanger's thermal comfort model and human exergy loss," Energy, Elsevier, vol. 138(C), pages 228-237.
    10. Guo, Hongshan & Aviv, Dorit & Loyola, Mauricio & Teitelbaum, Eric & Houchois, Nicholas & Meggers, Forrest, 2020. "On the understanding of the mean radiant temperature within both the indoor and outdoor environment, a critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 117(C).
    11. Deshko, Valerii & Buyak, Nadia & Bilous, Inna & Voloshchuk, Volodymyr, 2020. "Reference state and exergy based dynamics analysis of energy performance of the “heat source - human - building envelope” system," Energy, Elsevier, vol. 200(C).
    12. Mady, Carlos Eduardo Keutenedjian & Albuquerque, Cyro & Fernandes, Tiago Lazzaretti & Hernandez, Arnaldo José & Saldiva, Paulo Hilário Nascimento & Yanagihara, Jurandir Itizo & de Oliveira, Silvio, 2013. "Exergy performance of human body under physical activities," Energy, Elsevier, vol. 62(C), pages 370-378.

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