Explanation Assume that the air and water vapor are ideal gas; therefore write the expression to obtain the vapor pressure of air ( P v ) . P v = ϕ P g = ϕ P sat (I) Here, saturated pressure is P sat , relative humidity is ϕ , and saturation pressure of water is P g . Write the expression to obtain the dew point temperature of the air ( T dp ) . T dp = T sat @ P v (II) Here, saturation temperature at vapor pressure of air is T sat @ P v . Conclusion: Refer Table A-4, “Saturated water – Temperature table”, obtain the value of saturation pressure ( P sat ) as 3.1698 kPa at a temperature of 25 ° C

8th Edition

ISBN: 9780073398174

Author: Yunus A. Cengel Dr., Michael A. Boles

Publisher: McGraw-Hill Education

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Chapter 14.7, Problem 26P

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Chapter 14 Solutions

Thermodynamics: An Engineering Approach

Ch. 14.7 - What is the difference between dry air and...Ch. 14.7 - What is the difference between the specific...Ch. 14.7 - Can the water vapor in air be treated as an ideal...Ch. 14.7 - Is the relative humidity of saturated air...Ch. 14.7 - Is it possible to obtain saturated air from...Ch. 14.7 - Moist air is passed through a cooling section...Ch. 14.7 - How will (a) the specific humidity and (b) the...Ch. 14.7 - Prob. 8P Ch. 14.7 - Consider a tank that contains moist air at 3 atm...Ch. 14.7 - Why are the chilled water lines always wrapped...

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