HW23s - Spring 2006 ME 201 Thermodynamics Homework 23...

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Spring 2006 1 ME 201 Thermodynamics Homework 23 Solution 1. Complete the following table for the properties of an air/water vapor mixture. Solution: Answers are in bold . T dry bulb ( ° C) T wet bulb ( ° C) Rel.Hum. (%) ϖ (kg/kg of dry air) h a-v (kJ/kg of dry air) 15 6 20 0.002 21 35 25 45 0.016 77 10 10 100 0.00775 29.5 20 13.5 47 0.007 38 31.5 23.5 50 0.015 70 2. Air enters an evaporative cooler at 30 ° C and 20% relative humidity. How much liquid water (in kg/kg of dry air) at 15 ° C must be evaporated to cool the air to 20 ° C and a relative humidity of 70%? (HINT: Neglect the enthalpy brought in
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HW23s - Spring 2006 ME 201 Thermodynamics Homework 23...

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