Air at 38 C db and 18 C wb is humidified adiabatically with steam. The steam supplied contains 20 percent moisture (quality of 0.80) at 101.3 kPa. If the air is humidified to 60 percent relative humidity, what is the dry bulb temperature of the humidified air? Assume sea level pressure. (b) Air at 5 C db and 2 C wb is mixed with warm air at 38 C db and 25 C wb in the ratio of 2 kg cool air to 1 kga of warm air. (i) Compute the humidity ratio and enthalpy of the mixed air, and (ii) find the humidity ratio and enthalpy using psychrometric chart .(a) An auditorium is to be maintained at 25 C dry bulb temperature and 50% relative humidity. The supply air enters the auditorium at 17 C. The sensible and latent heat loads are 150 kW and 61 kW, respectively. Determine the wet bulb temperature, relative humidity, and volume flow rate of the supply air. (b) In a certain space to be air conditioned the sensible and latent heat loads are 20.60 kW and 6.78 kW, respectively. Outside air is at 33 C dry bulb and 24 C wet bulb temperatures. The space is to be maintained at 25 C with a relative humidity not exceeding 50%. All outside air is supplied with reheater. The conditioned air enters at 18°C. Determine (a) the refrigeration load required, (b) the capacity of the supply fan, and (c) the heat supplied in the reheater (a) An air conditioned auditorium with a capacity of 1000 persons is to be maintained at 24 C dry bulb temperature and 55% relative humidity. The sensible and latent heat loads are 115 kW and 42 kW, respectively. The conditioned air enters the auditorium at 17 C. For proper ventilation, 40% of the supply air is fresh air and the rest is recirculated air. Outside air is at 34 C and 50% relative humidity. Determine (a) the volume flow rate of recirculated air, (b) the apparatus dew point, and (c) the refrigeration load. (b) A meeting hall is to be maintained at 25 C db and 18 C wb. The barometric pressure is 101.3 kPa. The space has a load of 58.6 kW sensible and 58.6 kW latent. The temperature of the supply air cannot be lower than 18 C db. (a) How many kilograms per second of air must be supplied? (b) What is the required wet bulb temperature of the supply air? (c) What is the sensible heat ratio?
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