14-69 An air-conditioning system operates at a total pres-sure of 1 atm and consists of a heating section and a humidifier that supplies wet steam (saturated water vapor) at 100°C.Air enters the heating section at 10°C and 70 percent relative humidity at a rate of 35 m'/min, and it leaves the humidifying section at 20°C and 60 percent relative humidity. Deter-mine (a) the temperature and relative humidity of air when it leaves the heating section, (b) the rate of heat transfer in the heating section, and (c) the (rate at which water is added to the air in the humidifying section.

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