Liquid water at 40 degree C and a volumetric flow rate of 45 m^3/h enters a cool

Question

Liquid water at 40 degree C and a volumetric flow rate of 45 m^3/h enters a cooling tower operating at steady state. Atmospheric air enters at 1 atm and a dry-bulb temperature of 27 degree C and a wet-bulb temperature of 15 degree C. Moist air measurements taken at the exit of the cooling tower with an Omega^TM Multifunctional Environmental Meter model RH78 reads a temperature of 32 degree C and 90% relative humidity. Make up water from facilities is provided at 27 degree C. You are asked to analyze the effect of return-water-temperature, ranging from 27 degree C to 38 degree C, on mass flow rate of dry air and make-up water in kg/min. Assume that changes in potential and kinetic energy are negligible and environmental conditions do not change.

Explanation / Answer

Answer:

The movement of air from surface to atmosphere varies as temperature varies, as air moves from low temperature to high temperature meaning thereby the near surface particles warms up and moves upward whereas particles of cold temperature moves down. And the atmospheric temperature and dew point temperature varies with respect to altitude. First, the dew point temperature decreases with the rate of 10oC per km and after saturation point (means relative humidity becomes 100%) and after the saturation point temperature decreases with the rate of 6oC per km.

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