2 Air at 20°C DBT and 19°C DPT enters a heating and humidifying apparatus, from which it leaves at 35°C DBT and 28°C DPT. Moisture is supplied as liquid water at 25°C to humidify the air. Find the quantity of heat that must be added per kg of dry air through the apparatus. lind per minute to an auditorium maintained at 21°C