In a supermarket, air at atmospheric pressure and 25 °C issupplied to an air handling unit through a rectangular duct with across section of 0.5 m x 0.1 m. The air handling unit willdistribute 2/3 of the air to the large shopping area of thesupermarket at 25 °C, and it will cool the remaining air to -5 °Cand distribute it to a walk-in refrigerator. To avoid frictionalpressure losses, the average air velocity in the ducts should be 5m/s. Assume pressure changes in the system are negligible.
a. What is the mass flowrate of air into the air handlingunit?
b. Find the cross-sectional areas of the two ducts leaving the airhandling unit,transporting air to the shopping area and therefrigerator.
