Take Home Exam Q1: The following data refer to public hall AC system: 100% Outdoor conditions: tab= ?; o = ? Comfort conditions: tab = 20°C; = 50% Seating capacity of

the hall = z Outdoor air supplied = 0.3 m³/min/person If the required comfort condition is achieved first by adiabatic humidification and then sensible cooling process find: 1. The capacity of the cooling coil in (TR) 2. The coil surface temperature if the by-pass factor is 0.25 3. The mass of water required in the humidifier, in kg/hr 4. The efficiency of the humidifier Q2: Air enters a cooling coil (of By-Pass factor BF) at 24°C dry-bulb-temperature and 50% relative humidity with a dry air mass flow rate of 0.9 kg/s. The air leaving the cooling coil at 9°C is reheated to 13°C. The total pressure is constant at P kPa. Determine (i) the Apparatus dew-point temperature (ADP)of the coil, (ii) the rate of moisture removal in the cooling coil, in kg/hr (iii) the refrigeration capacity of the cooling coil, in kW (iv) The heat input rate of the heating coil, in kW Enthalpy kikg