In a supermarket, air at atmospheric pressure and 25 C issupplied to a...

In a supermarket, air at atmospheric pressure and 25 Â°C is supplied to an air handling...

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Mechanical Engineering

In a supermarket, air at atmospheric pressure and 25 Â°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 Â°C, and it will cool the remaining air to -5 Â°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.

Answer & Explanation Solved by verified expert

4.4 Ratings (803 Votes)

aConsidering air flow into the air handling unitBy ideal gas equation PV mRTP RT101325 0287 298Density of air intake 1184kgm3Mass flow rate is given by the continuity equation asm A V See Answer

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