An air-conditioning system is to take in outdoor air at 10°C and 30 percent relative humidity at a steady rate of 45 m³/min and to condition it to 25°C and 60 percent relative humidity. The outdoor air is first heated to 22°C in the heating section and then humidified by the injection of hot steam in the humidifying section. Assuming the entire process takes place at a pressure of 100 kPa, determine (a) the rate of heat supply in the heating section and (b) the mass flow rate of the steam required in the humidifying section. Heating coils Humidifier T₁ = 10°C telllllll $1=30% Air T3=25°C 103=60% V₁ = 45 m³/min T₂ = 22°C 2 3 $1 = 30% 2 $3 = 60% 10°C 22°C 25°C 3