Question

In water cooling tower air enters at a height of 1 m above the ground
level and leaves at a height of 7 m. The inlet and outlet velocities are 20
m/s and 30 m/s respectively. Water enters at a height of 8 m and leaves at
a height of 0.8 m. The velocity of water at entry and exit are 3 m/s and 1
m's respectively. Water temperatures are 80°C and 50°C at the entry and
exit respectively. Air temperatures are 30°C and 70C at the entry and
exit respectively. The cooling tower is well insulated and a fan of 2.25 W
drives the air through the cooler. Find the amount of air per second
required for 1 kg/s of water flow. The values of c, of air and water are
1.005 and 4.187 kJ/kg K respectively,​

Answer 1

Answer:

Explanation:

Applying steady flow energy equation at the inlet and outlet condition of air.

h1+ v1²/2 + gz1+ q= h2+ v2²/2 +gz2+ w

where w is the work done by the gas, q is heat given to the system.

let 'm' be the mass flow rate of...