Steam produced in a nuclear power plant is condensed using cooling water that enters the condenser at 293 K and leaves heated at 313 K. The hot water flows at 4104 kg/s to a natural-draft cooling tower, where it is re-cooled to 293 K and returned to the condenser. You are to design the natural-draft cooling tower.

The tower will operate at 1 atm. The available dry air is at 298 K with a wet-bulb temperature of 285 K. Specialized packing will be used for which Kya is expected to be 1.0 kg/m3 -s if the liquid mass velocity is at least 3.4 kg/m2 -s and the gas mass velocity is at least 2.75 kg/m2 -s. The average heat capacities and heat of vaporization within the operating temperature range are:

Water T₀ = 273 K; Air T₀ = 273 K; C_p,gas = 1.884 kJ/kg-K; C_p,gas = 1.005 kJ/kg-K; C_p,liq = 4.187 kJ/kg-K; _vap = 2502.3 kJ/kg

Requirements:

1. Calculate the minimum airflow rate, in [kg dry air/s]. 27,600 kg/s

2. Obtain the enthalpy in [kJ/kg] in the exit air stream when the airflow rate of 1.2 times the minimum. 135 kJ/kg

3. Obtain the temperature, in [K] in the exit air stream when the airflow rate of 1.2 times the minimum. 308 K

4. Calculate the absolute humidity in the exit air stream when the airflow rate of 1.2 times the minimum. 0.039

5. Calculate the cross-sectional area of the column, in [m² ]. 11,764 m²

6. Calculate the height of the column, in [m], if N_tOG is equal to 6.514. 18 m

110 1. 11. 110 1. 11