3-2 Air at 38°Cdb and 20°Cwb and 101kPa is mixed adiabatically with liquidwater supplied at 60°C, in such proportions that the mixture has a relativehumidity of 80%RH. Find the dry-bulb temperature of the mixture.3-3 It is desired to heat and humidify 1.0m/s of air from an initial start definedby a temperature of 16°C dry bulb and relative humidity of 30%RH to a finalstate of 43°C dry bulb and 30%RH relative humidity. The air will first beheated by a hot water coil followed by adiabatic humidification using saturatedvapor at 34.5kPa. Using the psychometric chart, find the heat transfer for theheating coil and the mass flow rate of the water vapor, and sketch the processeson a skeleton chart showing pertinent data.3-4 A meeting hall is to be maintained at 25°Cdb and 18°Cwb. The barometricpressure is 101.3kPa. The space has a load of 58.6kW sensible and 58.6kwlatent. The temperature of the supply air to the space cannot be lower than18°Cdb. (a) how many kg/s of air must be supplied? (b) What is the sensibleheat ratio?3-5 What is the maximum relative humidity to prevent condensation on pipescarrying water at 10°C through a room that has an air temperature of 19°C?3-6 Outdoor air at 38°Cdb and 26°Cwb is cooled to 15°Cdb and 14°Cwb.The process occurs at 101.3kPa barometric pressure. Determine (a) the mass ofwater condensed per kilogram of dry air and (b) the sensible and latent heattransfer per kilogram of dry air and the sensible heat factor.3-7 saturated water vapors at 100°C is used to humidify a stream of moist air.The air enters the humidifier at 13°Cdb and 2°Cwb at a flow rate of 2.5m/s.The pressure is 101.35kPa. Determine (a) the mass flow rate of the steamrequired to saturate the air and (b) the temperature of the saturated air.3-8 A building has a calculated cooling load of 410kw. The latent portion of theload is 100KW. The space is to be maintained at 25°Cdb and 50%RH relativehumidity. Outdoor air is at 38°C and 50%RH relative humidity, and 10% bymass of the air supplied to the space is outdoor air. Air is to be supplied to thespace at not less than 18°C. Assume sea level pressure and find (a) theminimum amount of air supplied to the space in m/s, (b)the volume flow ratesof the return air , exhaust air , and outdoor air ,(c) the condition and volumeflow rate of the air entering the cooling coil ,and (d) the capacity , apparatusdou noint tomnoroturobunege footond SUE of the ooeling oeil

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3-2 Air at 38°Cdb and 20°Cwb and 101kPa is mixed adiabatically with liquid water supplied at 60°C, in such proportions that the mixture has a relative humidity of 80%RH. Find the dry-bulb temperature of the mixture.