You are designing a drier that must evaporate 200 lb/h of h2o from sludge by using air. air at 70°f and 50% relative humidity is drawn into the drier and it leaves at 140f and 70% relative humidity. how much volume of dry air needs to be used for this operation?
b. four hundred kg/h of steam from a low pressure turbine at 12.5 atm. and 250 c goes into a feed water heater which preheats the water entering the economizer in a boiler. the steam is comes out of the feed water at 200 c. the water at a flow rate of 500 kg/h enters the feed water heater at 20c. calculate the feed water exit temperature.