1.  

It is required to maintain an air-conditioned hall at 280C DBT and 200C WBT. It has a sensible heat load of 45.4KW and a latent heat load of 16.5 KW. The air supplied from the outside atmosphere at 390C DBT and 280C WBT is 22 m3/min, directly in to room through ventilation and infiltration. Outside air to be conditioned is passed through the cooling coil whose apparatus dew point is 140C, 60 percent of the recirculated air from the hall is mixed with the conditioned air after the cooling coil. Determine a. Condition of the air after the coil and before the recirculated air mixes with it b. Condition of air entering the hall i.e., after mixing with recirculated air c. Mass of fresh air entering the cooler d. Refrigerating load in the cooling coil