If a breath of air, with a volume of 0.5 liter, is drawn into the lungs and come

Question

If a breath of air, with a volume of 0.5 liter, is drawn into the lungs and comes to thermal equilibrium with the body at 37 degree C while the pressure remains constant, calculate the increase in enthalpy of the air if the initial air temperature is 20 degree C and the pressure is 1 atm.. (Assume air, which is mainly N2 and O2, is an ideal diatomic gas with Cv = 5R/2.) At a breathing rate of 12 per minute, how much heat is lost in this fashion in 1 day? Compare your answer with a typical daily intake of 12,000 kJ of food energy. What problems might you foresee in arctic climates, where the air temperature can reach -40 degree C and below?

Explanation / Answer

use this dUcv = dQ + dUin + d(pinVin) - dUout - d(poutVout) answe is 252 joules

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