6. A cinema hall of seating capacity 1500 persons has been provided with an air conditioned plant with the following data: Outdoor conditions Required indoor conditions Amount of outdoor air supplied = 40°C DBT and 20°C WBT = 20°C DBT and 60% RH = 0.3 m³/min/person If the required condition is achieved first by adiabatic humidifying and then by cooling, find: 1. the capacity of cooling coil and surface temperature of the coil if by-pass factor is 0.25; and 2. the capacity of the humidifier and its efficiency. [Ans. 118.8 kW; 15.27°C; 72 kg / h, 29% ]