Question

Air is cooled from 300 K to 273 K as it flows steadily through a duct. Frictional dissipation may be neglected. Cooling is achieved by removing heat via a heat pump. The work requirement is 1.15 times that of a reversible heat pump operating between 263 and 310 K. For each mole of air flowing through the duct, calculate: Air can be assumed an ideal gas with a constant heat capacity cP of 3.50R. The temperature of the surroundings is 300 K

a) Total irreversibility in J/mole

b) Irreversibility due to heat transfer between air and the heat pump

c) Irreversibility due to heat transfer between the heat pump and the surroundings

d) Internal irreversibility of the heat pump

Answer 1