A variable air volume (VAV) air conditioning system supplies air to a single zone maintained at 26°C db-temperature and 20°C wbtemperature. The system is designed to meet a sensible cooling load of 32...

A variable air volume (VAV) air conditioning system supplies air to a single zone maintained at 26°C db-temperature and 20°C wbtemperature. The system is designed to meet a sensible cooling load of 32 kW and a latent cooling load of 21.5 kW, for which the supply air dbtemperature is 16°C. When the system operates under part-load conditions the sensible and latent cooling loads are 5.2 kW and 1.4 kW respectively. The mass flow rate of supply air is 25% of the mass flow rate under design conditions. The pressure is constant at 101.3 kPa. Determine (i) the mass flow rate of supply air under design conditions, (ii) the supply air relative humidity under design conditions, and (iii) the supply air db-temperature and relative humidity under part-load conditions