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QUESTION 3 An air conditioning system operates at a total pressure of 1 atm and consists of a heating section and a humidifier that supplies wet steam (saturated water vapor) at 100°C as shown in Figure 1. Air enters the heating section at 15°C and 80°C relative humidity at a rate of 35 m³/min and it leaves the humidifying section at 25°C and 70% relative humidity. Analyse: Heating coils 15°C eeeeeeee Air 80% 35 m3/min P = 1 atm Figure 1 Sat. vapor 100°C ii. the rate of heat transfer in the heating section Humidifier 25 °C 70% i. the temperature and relative humidity of air when it leaves the heating section iii. the rate at which water is added to the air in the humidifying section [13 marks] [6 marks] [6 marks]