Titre : Exergy assessment of metabolic changes on life expectancy of smokers 

Auteurs : Izabela B. Henriques, Carlos E. K. Mady, Silvio de Oliveira Junior,  

Revue : Entropy: Thermodynamics – Energy – Environment – Economy  

Numéro : Issue 1 

Volume : 1 

Date : 2020/03/4 

DOI : 10.21494/ISTE.OP.2020.0494 

ISSN : 2634-1476 

Résumé : A few authors have determined exergy behavior of human body under standard conditions. Some of these studies include estimate of life expectancy based on the association of entropy creation / exergy destruction and rate of living theory. Metabolism is known as the major source of irreversibility in human body. Thus, metabolic alterations are expected to affect its exergy behavior and, according to rate of living theory, life expectancy. Some authors discovered that even smokers without smoking-related diseases present metabolism higher than non-smokers, which contributes to weight gain after smoking cessation. According to medical literature, metabolism of smokers is 20% greater than non-smokers, in addition to the known thermogenic effect after cigarette smoking. In the present work, exergy analysis is applied to human body in order to evaluate the effect of metabolic increase in smokers on exergy behavior and life expectancy. The analysis takes into account exergy rates and flow rates due to convection, radiation, respiration, evaporation and exergy metabolism. A multi-segment thermal model of human body available in literature is utilized to perform First Law analysis. Results of destroyed exergy integrated over life span indicate that a smoker destroys around 730 MJ/kg more exergy than a non-smoker until the age of 73.5, which would represent a decrease of 15 years in life expectancy for this group. 

Éditeur : ISTE OpenScience