. Outside air is available at 20oC and 50% relative humidity. This air is being
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Question
. Outside air is available at 20oC and 50% relative humidity. This air is being delivered to a drier at an airflow rate of 150 m3/min. a. What is the absolute humidity of the air? b. What is the specific volume of the air? c. What is the mass flow rate of the air being delivered to the drier? d. If the air enters the drier and is then heated to 50oC by the drier burner, what is the mass flowrate and volumetric flowrate of the air leaving the burner area? e. If the heated air is passed through food granules at 70% MCwb and leaves at 90% relative humidity, what is the temperature of the exit air? f. What is the water removal rate from the granules?Explanation / Answer
by psychometric chart a) 0.0075 gm of water in 1 gm of air b)0.82 c)mass of air 150/0.82 = 182.9 kg/min d)mass will remain const = 182.9 kg/min v = 182.9*0.925 = 169.2 m^3/min e)37deg C f) (0.032-0.0075) gm of water by 1gm of dry air so 0.0245*182.9 kg of water by 182.9kg of air so rate is 4.48 kg /min
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