Question

Moist air at 20C and 50% relative humidity enters a duct consisting of a heating section followed by an evaporative cooling process. The air is heated to 35C in the heating section. The air then enters the evaporative cooling section where liquid water is injected into the moist air. The moist air exits the evaporative cooling section at 60% relative humidity. A. Determine the specific humidity at the exit of the heating section. (5 of 45 points. Please input your final answer in the box below) B. Determine the specific enthalpy of the moist air per kg of dry air at the outlet of the heating section. (5 of 45 points. Please input your final answer in the box below) C. Determine the specific enthalpy of the moist air per kg of dry air at the outlet of the evaporative cooling section. (5 of 45 points. Please input your final answer in the box below) D. Determine the temperature of the air at the exit of the evaporative cooling section.

Answer 1

ray bulb tempractone T = 20°c, 0, - 50% T2 =35°c 0-60% D-50% B = 60% 1 W Specific humidity Evaporative "Cooling 2 2 Heating Dry Bulb Tempracture To foom Psychoonetric Chart! - wa = 0.0072 kJ/kg of Day air h, 54.9 KJ / kg of day aih " (D) T 3 - 25°C (6) Wet Bulb tempracture Twis Twis = 19°C A h-hi = 54,9 - 40 Ah = 14.9 kJ/kg of deey wil (A) W3 = 0.018 KI/kg a dog air