Question

A rigid storage tank of 1.5 m³ contains 1 kg argon at 30°C. Heat is then transferred to the argon from a furnace operating at 1300°C until the specific entropy of the argon has increased by 0.343 kJ/kg K. Find the total heat transfer and the entropy generated in the process.  

Answer 1

C.V. Argon out to 1300°C. Control mass. , m = 1 kg

Argon is an ideal gas with constant heat capacity.

Heat transfer from energy equation 

₁Q₂ = 1 × 0.312 (909.45 − 303.15) = 189.2 kJ

Entropy generation from entropy equation (2nd law) 

₁S₂ gen tot = m(s₂ − s₁) − ₁Q₂/T_res 

 = 1 x 0.343 − 189.2 / (1300 + 273) = 0.223 kJ/K