Air is flowing from the alveoli to the trachea. The temperature of the air within the alveoli is 37oC and the pressure inside the alveoli is 1.15 atm, and the pressure inside the trachea is 1.1 atm. Assume the specific heat for air is constant and equal to 1.005 kJ/(kg K) and the gas constant for air is 287 J/(kg K).

(A) If the process is isentropic, determine the temperature of the air in the trachea.

(B) Assuming that the average volumetric rate of air exhaled (measured at standard physiological conditions, i.e., 1 atm and 37oC) is 500 mL, what is the rate of heat loss (per breath) from the air when exhaling? (Assume that the process is no longer isentropic, but still use your answer from part A. Neglect any changes in velocities between the alveoli and trachea.)

HINT:(A: T = 32. 9C)