A dual-duct air conditioning system similar to that shown in Fig. 5.14(a), supplies air to two zones A and B with the design conditions summarized in Table P5.11. Zone A gains sensible and latent heat...

A dual-duct air conditioning system similar to that shown in Fig. 5.14(a), supplies air to two zones A and B with the design conditions summarized in Table P5.11. Zone A gains sensible and latent heat while zone B looses sensible heat.

Of the total return air dry mass flow, 50% is discharged and replaced with an equal quantity of outdoor air at 15.5°C db-temperature and 40% relative humidity. The supply air in the cold duct is saturated at 4.5°C. The air in the hot air duct is at 35°C db-temperature and 20% relative humidity. The pressure is constant at 101.3 kPa. Determine (i) the supply air mass flow rates to the two zones, (ii) the mass flow rates of hot air to the two zones, (iii) the heat input by the heater, (iv) the refrigeration capacity of the cooling coil, and (v) the rate of moisture addition in the air washer. Check the overall energy balance for the system.