Question

Ammonia is contained in a rigid sealed tank unknown quality at 0°C. When heated in boiling water to 100°C its pressure reaches 1200 kPa. Find the initial quality, the heat transfer to the ammonia and the total entropy generation. 

Answer 1

C.V. Ammonia, which is a control mass of constant volume.

Energy Eq   u₂ - u₁ = ₁q₂ - ₁w₂