Outdoor air enters an air-conditioning system at 10oC and 70 percent relative humidity at a steady rate of 26m3/min, and it leaves at 25oC and 55 percent relative humidity. The outdoor air is first heated to 18oC 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 1 atm, determine
(a) The rate of heat supply in the heating section.
(b) The mass flow rate of steam required in the humidifying section.