Moist air at 278C, 1 atm, and 50% relative humidity enters

Chapter 12, Problem 12.88

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Moist air at \(27^{\circ} \mathrm{C}\), 1 atm, and 50% relative humidity enters an evaporative cooling unit operating at steady state consisting of a heating section followed by a soaked pad evaporative cooler operating adiabatically. The air passing through the heating section is heated to \(45^{\circ} \mathrm{C}\). Next, the air passes through a soaked pad exiting with 50% relative humidity. Using data from the psychrometric chart, determine

(a) the humidity ratio of the entering moist air mixture, in kg(vapor) per kg(dry air).

(b) the rate of heat transfer to the moist air passing through the heating section, in kJ per kg of mixture.

(c) the humidity ratio and temperature, in \({ }^{\circ} \mathrm{C}\), at the exit of the evaporative cooling section.

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