Air enters an adiabatic diffuser at 500 kPa and 30°C with a velocity of 20 m/s. The diffuser has an inlet diameter of 8 cm. Air leaves the diffuser at 800 kPa and 80°C. If the exit diameter of the diffuser is 20 cm, determine:
i) The mass flow rate
ii) The exit velocity
iii) The exit volumetric flow rate
iv) The heat transfer to or from the diffuser