Problem #11 Air at 80°F and 80% relative humidity is cooled to 51°F at a constan

Question

Problem #11 Air at 80°F and 80% relative humidity is cooled to 51°F at a constant pressure of 1 atm. Use the psychrometric chart to calculate the fraction of water that condenses, and the rate at which heat must be removed to deliver 1,000 ft3 /min of humid air at the final conditions. Notice that the air is saturated when exiting the condenser. Enter your results in the following tables: Properties of air entering the condenser Absolute Humidity lb water/ lb dry air Enthalpy Btu/ lb dry air Humid Volume cubic feet/ lb dry air Wet bulb temperature Dew point temperature Fraction water condensing: Heat Removed: Btu/min

Explanation / Answer

From humidity chart

Absolute humidity = 0.018 lb water/lb dry air

Enthalpy = 38.54 Btu/lb dry air

Humid volume = 14.1 cu ft /lb dry air

Wet bulb temperature =75.17 F

Dew point = 73.27 F

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