A constant volume, dual-duct, air conditioning system supplies air to a single zone, maintained at 25°C db-temperature. The system has been designed for a maximum heating load of 8 kW, and a maximum...

A constant volume, dual-duct, air conditioning system supplies air to a single zone, maintained at 25°C db-temperature. The system has been designed for a maximum heating load of 8 kW, and a maximum sensible cooling load of 7 kW. The heating coil and the cooling coil supply air at 40°C and 14°C db-temperature respectively. The pressure is constant at 101.3 kPa. Determine the following quantities when the space is experiencing a sensible cooling load of 4.5 kW: (i) the supply air temperature, (ii) the mass flow rates of air from the hot and cold air ducts.