# PA6 (1) - Department of Civil and Environmental Engineering...

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Department of Civil and Environmental Engineering Carleton University ENVE 2001, Winter 2016 PROBLEM ANALYSIS #6: MASS BALANCE AND HUMIDITY (March 9) Problem 1. Sludge is a term that is generally used for a mixture of solids and water. In the following figure, the water content of the sludge is reduced first by mechanical separation (centrifugation), then by contact with warm air. Ambient air is first heated in the heater by using some external source of energy; the air then passes through the drier where it picks up moisture from the sludge. a. What is the dew point and wet bulb temperature of the incoming moist air? b. What is the wet bulb temperature of the air leaving the dryer? c. How much moist air (in m 3 /h) is required for the process shown? [Note: vapor pressure of H
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Unformatted text preview: 2 O at 21.1 °C and 37.7 °C is 18.6 mmHg and 48.7 mmHg, respectively]. Problem 2. 1000 kg of coal is being burned with 30% excess of air. The initial temperature of air is 25 °C, P = 760 mmHg and its relative humidity is 70%. The coal consists of 65% C, 5.6% H, 0.7% N, 1.7% S, 20% moisture, 7% ash (the percent numbers are weight percent). The combustion converts C into CO 2 , H into H 2 O, S into SO 2 , and N into N 2 . This mixture exits the combustor via the flue gas stack at P = 760 mmHg. What is the dew point of the flue gas? [Note: (1) vapor pressure of H 2 O at 25 °C is 23.6 mmHg, (2) for H 2 O , the constants for Antoine equation are A = 18.3036, B = 3816.44, C = -46.13]....
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• Spring '14
• OnitaBasu
• Environmental Engineering, Atmospheric thermodynamics, Water vapor, Department of Civil and Environmental Engineering, Wet bulb temperature

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