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5 - Exergy in Biological Systems

Published online by Cambridge University Press:  19 March 2021

Efstathios Michaelides
Efstathios Michaelides
Affiliation:
Texas Christian University
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Summary

Solar irradiance is the source of exergy for all living organisms. Photosynthesis in primeval organisms generates the food for the other species. It also provides the chemical energy in biomass that is used as fuel. Energy conversions in humans produce mechanical work using food as the exergy source. The food intake; the metabolic and thermic processes in the human body; the production of adenosine triphosphate (ATP); and the conversion of the ATP energy into mechanical work are analyzed using the principles of thermodynamics. An interesting conclusion is that humans have evolved as inefficient energy conversion systems, with food-to-work exergetic efficiencies close to 10%. The analyses and a number of examples in this chapter elucidate the application of thermodynamics to biological processes including: production and use of biomass; exergy value of nutrients; exergy spent for vital processes, such as respiration, blood circulation, and maintenance of body temperature; and exergy spent in sports, such as weight-lifting, walking races, the marathon, and bicycling. The chapter also surveys the relationship between exergy destruction, the state of health, aging, and life expectancy.

Keywords

photosynthesisbiomass exergyexergy of nutrientsmetabolismrespiratory quotientATP exergyexergy and exercisehuman mass and energy balancesexergy and humanslongevity
Type
Chapter
Information
Exergy Analysis for Energy Conversion Systems , pp. 201 - 250
Publisher: Cambridge University Press
Print publication year: 2021

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References

Silva, C. S., Seider, W.D., and Lior, N., Exergy Efficiency of Plant Photosynthesis, Chemical Engineering Science, 130 (2015), 151–71.CrossRefGoogle Scholar
Lems, S., van der Kooi, H. J., and de Swaan Arons, J., Thermodynamic Analysis of the Living Cell: Design of an Exergy-Based Method, International Journal of Exergy, 4 (2007), 339–56.CrossRefGoogle Scholar
Petela, R., An Approach to the Exergy Analysis of Photosynthesis. Solar Energy, 82 (2008), 311–28.Google Scholar
Lems, S., van der Kooi, H. J., and de Swaan Arons, J., Exergy Analyses of the Biochemical Processes of Photosynthesis. International Journal of Exergy, 7 (2010), 333–51.CrossRefGoogle Scholar
Bisio, G. and Bisio, A., Some Thermodynamic Remarks on Photosynthetic Energy Conversion. Energy Conversion and Management, 39 (1998), 741–48.Google Scholar
Reis, H. A. and Miguel, A. F., Analysis of the Exergy Balance of Green Leaves. International Journal of Exergy, 3 (2006), 231–37.Google Scholar
Food and Agriculture Organization of the United Nations, Renewable Biological Systems for Alternative Sustainable Energy Production. In Miyamoto, K. ed., Food and Agriculture Organization of the United Nations, Bulletin 128 (Rome, Italy: FAO, 1997).Google Scholar
Michaelides, E. E., Alternative Energy Sources (New York: Springer, 2012).CrossRefGoogle Scholar
Michaelides, E. E., Energy, the Environment, and Sustainability (Boca Raton, FL: CRC Press, 2018).CrossRefGoogle Scholar
Royal Academy of Engineering, Sustainability of Liquid Biofuels (London: RAEng, 2017).Google Scholar
Piementel, D., Ethanol Fuels: Energy Balance, Economics, and Environmental Impacts are Negative. Natural Resources Research, 12 (2003), 127–34.Google Scholar
Patzek, T., Thermodynamics of the Corn-Ethanol Biofuel Cycle. Critical Reviews in Plant Science. 23 (2004), 519–67.CrossRefGoogle Scholar
Shapouri, H., Duffield, J.A., and Wang, M., The Energy Balance of Corn Ethanol: An Update, US Dept. of Agriculture, Agricultural Economic Report (2002).Google Scholar
Wang, M, Saricks, C., and Wu, M., Fuel-Cycle Fossil Energy Use and Greenhouse Gas Emissions of Fuel Ethanol Produced from U.S. Midwest Corn, Argonne National Laboratory Report (December 17, 1997).Google Scholar
Ptasinsky, K. J., Efficiency of Biomass Energy: Exergy Approach to Biofuels, Power, and Biorefineries (Hoboken, NJ: Willey, 2016).Google Scholar
Hornborg, A., The Magic of Money and the Illusion of Biofuels: Toward an Interdisciplinary Understanding of Technology. The European Physical Journal Plus, 132 (2017), 82.CrossRefGoogle Scholar
Tester, J. W., Drake, E. M., Driscoll, M. J., Golay, M. W., and Peters, W. A., Sustainable Energy (Cambridge, MA: MIT Press, 2005).Google Scholar
Biofuel Fact Sheet, European Biotechnology Energy Platform, www.etipbioenergy.eu/images/EIBI-7-aquatic%20biomass.pdf (last accessed in September 2018).Google Scholar
Sheehan, J., Dunahay, T., Benemann, J., and Roessler, P., A Look Back at the US Department of Energy’s Aquatic Species Program - Biodiesel from Algae, Report TP-580-24190 (CO: National Energy Laboratory, 1998).Google Scholar
Sorgüven, E. and Özilgen, M., Thermodynamic Efficiency of Synthesis, Storage and Breakdown of the High-Energy Metabolites by Photosynthetic Microalgae. Energy, 58 (2013), 679–87.Google Scholar
Bharathiraja, B., Chakravarthy, M., Kumar, R. M, Yogendran, D, Yuvaraj, D., Jayamuthunagai, J., Kumar, R. P., and Palani, S., Aquatic Biomass (Algae) as a Future Feed Stock for Bio-Refineries: A Review on Cultivation, Processing and Products. Renewable and Sustainable Energy Reviews, 47 (2016), 634–53.Google Scholar
Schrodinger, E., What Is Life? The Physical Aspect of the Living Cell (Cambridge: Cambridge University Press, 1944).Google Scholar
Annamalai, K., Puri, I. K., and Jog, M. A., Advanced Thermodynamics Engineering, 2nd ed. (Boca Raton, FL: CRC Press, 2011).Google Scholar
Gropper, S. S. and Smith, I. L., Advanced Nutrition and Human Metabolism, 6th ed. (Belmont, CA: Wadsworth, 2013).Google Scholar
Lems, S., van der Kooi, H. J., and de Swaan Arons, J., The Second-Law Implications of Biochemical Energy Conversion: Exergy Analysis of Glucose and Fatty-Acid Breakdown in the Living Cell. International Journal of Exergy, 6 (2009), 228–48.Google Scholar
Mady, C. E. K. and Oliveira Junior, S., Human Body Exergy Metabolism. International Journal of Thermodynamics, 16 (2013), 73–80.CrossRefGoogle Scholar
McArdie, W. D., Katch, F. I., and Katch, V. L., Exercise Physiology: Nutrition, Energy, and Human Performance, 7th ed. (Philadelphia, PA: Kluwer, 2010).Google Scholar
Knab, A. M., Shanely, R. A., Corbin, K. D., Jin, F., Sha, W., and Nieman, D. C., A 45-Minute Vigorous Exercise Bout Increases Metabolic Rate for 14 Hours. Medicine & Science in Sports & Exercise, 43 (2011), 1643–48.CrossRefGoogle ScholarPubMed
Mady, C. E. K., Ferreira, M. S., Yanagihara, J. I., and de Oliveira, S., Human Body Exergy Analysis and the Assessment of Thermal Comfort Conditions. International Journal of Heat and Mass Transfer, 77 (2014), 577–84.CrossRefGoogle Scholar
Churchill, S. W. and Bernstein, M., A Correlating Equation for Forced Convection from Gases and Liquids to a Circular Cylinder in Crossflow. Journal of Heat Transfer, 99 (1977), 300–6.CrossRefGoogle Scholar
Churchill, S. W. and Chu, H., Correlating Equations for Laminar and Turbulent Free Convection from a Vertical Plate. International Journal of Heat and Mass Transfer, 18 (1975), 1323–29.Google Scholar
Kodama, T., Thermodynamic Analysis of Muscle ATPase Mechanisms. Physiological Reviews, 65 (1985), 468–551.CrossRefGoogle ScholarPubMed
Marques-Spanghero, G., Albuquerque, C., Lazzaretti-Fernandes, T., Hernandez, A. J., and Keutenedjian-Mady, C. E., Exergy Analysis of the Musculoskeletal System Efficiency During Aerobic and Anaerobic Activities. Entropy 2018, 20 , 119 (2018), 1–16.Google Scholar
Spriett, L. L., and Watt, M. J., Regulatory Mechanism for the Interaction between Carbohydrate and Lipid Oxidation during Exercise. Acta Physiologica Scandinavia, 178 (2003), 205–43.Google Scholar
Kodama, T., Kurebayashi, N., Harafuji, H., and Ogawa, Y., Calorimetric Studies of the Mechanism of the Ca*+-ATPase Reaction of Sarcoplasmic Reticulum. Journal of Biochemistry, 96 (1984), 887–94.CrossRefGoogle Scholar
Kodama, T., Kurebayashi, N., and Ogawa, Y., Heat Production and Proton Release during the ATP-Driven Ca Uptake by Fragmented Sarcoplasmic Reticulum from Bullfrog and Rabbit Skeletal Muscle. Journal of Biochemistry, 88 (1980), 1259–65.Google Scholar
Barclay, C. J., Woledge, R. C., and Curtin, N. A., Inferring Cross-Bridge Properties from Skeletal Muscle Energetics. Progress in Biophysics & Molecular Biology, 102 (2010), 53–71.Google Scholar
Offer, G. and Ranatunga, K. W., A Cross-Bridge Cycle with Two Tension-Generating Steps Simulates Skeletal Muscle Mechanics. Biophysical Journal, 105 (2013), 928–40.Google Scholar
Demirel, Y. and Sandler, S. I., Thermodynamics and Bioenergetics. Biophysical Chemistry, 97 (2002), 87–111.CrossRefGoogle ScholarPubMed
Kestin, J., A Course in Thermodynamics, vol. 2 (Washington, DC: Hemisphere, 1979).Google Scholar
Stucki, J. W., The Optimal Efficiency and the Economic Degrees of Coupling of Oxidative Phosphorylation. European Journal of Biochemistry, 109 (1980), 269–83.Google Scholar
Kedem, O. and Caplan, S. R., Degree of Coupling and Its Relation to Efficiency in Energy Conversion. Transaction of the Faraday Society, 61 (1965), 1897–911.Google Scholar
Prigogine, I. and Wiame, J., Biologie et Thermodynamique des Phenomenes Irreversibles. Experimenta, 2 (1946), 451–53.CrossRefGoogle Scholar
Demirel, Y., Exergy Use in Bioenergetics. International Journal of Exergy, 1 (2004), 128–47.Google Scholar
Silva, C. A. and Annamalai, K., Entropy Generation and Human Aging: Lifespan Entropy and Effect of Physical Activity Level. Entropy, 10 (2008), 100–23.Google Scholar
Kondepudi, D. and Prigogine, I., Modern Thermodynamics: From Heat Engines to Dissipative Structures (New York: Wiley 1999).Google Scholar
Perunov, N., Marsland, R., and England, J., Statistical Physics of Adaptation. Physical Review X, 6 (2) (2016), 021036.Google Scholar
Aoki, I., Entropy Principle for Human Development, Growth and Aging. Journal of Theoretical Biology, 150 (1991), 215–23.CrossRefGoogle ScholarPubMed
Aoki, I., Entropy Production in Human Life Span: A Thermodynamical Measure for Aging. Age, 1 (1994), 29–31.Google Scholar
Silva, C. A. and Annamalai, K., Entropy Generation and Human Aging: Lifespan Entropy and Effect of Diet Composition and Caloric Restriction Diets. Journal of Thermodynamics, (2009), 1–10.CrossRefGoogle Scholar
Hershey, D., Entropy Theory of Aging Systems: Humans, Corporations and the Universe (London: Imperial College Press, 2010).Google Scholar
Zotin, A. A. and Pokrovskii, V. N., The Growth and Development of Living Organisms from the Thermodynamic Point of View. Biological Physics, 512 (2018), 359–66.Google Scholar

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