An office area is to be maintained at 25C DBT and 19C WBT. The sensible heat load is 100 kW and 60 kg/hr of moisture must be removed. Air is supplied to the lecture theatre at 18C. Determine (a) the mass flow rate of supply air, (b) the relative humidity, dew point, and wet bulb temperatures of the supply air, (c) the latent heat load, and (d) the sensible heat ratio (SHR). A conference room for seating 150 persons is to be maintained at 22C DBT and 60% RH. The outdoor conditions are 40C DBT and 27C WBT. The various load in the auditorium are as follows: Sensible and latent heat loads per person, 80W and 50W respectively. Lights and fans 15,000 W. Sensible heat gain through glass, walls, ceiling etc., 15,000 W. The air infiltration is 20 m'/min and fresh air supply is 100 m/min. Determine ERSHL and ERLHL.