Explanation Express the vapor pressure of air before compression. P ν 1 = ϕ 1 P g = ϕ 1 P sat@20°C (I) Here, vapor pressure of air before compression is P ν 1 , relative humidity at state 1 is ϕ 1 , vapor pressure is P g and saturation pressure at temperature of 20°C is P sat@20°C . Express pressure ratio. P R = P P a (II) Here, absolute pressure is P and atmospheric pressure is P a . Express the vapor pressure of air after compression. P ν 2 = P ν 1 × P R (III) Express dew point temperature of the air. T dp = T sat@ P ν 2 (IV) Here, saturation temperature at vapor pressure of air after compression is T sat@ P ν 2 . Conclusion: Refer Table A-4, “saturated water-temperature table”, and write the saturation pressure at temperature of 20°C . P sat@20°C = 2.3392 kPa Substitute 0.50 for ϕ 1 and 2.3392 kPa for P sat@20°C in Equation (I). P ν 1 = ( 0.50 ) ( 2.3392 kPa ) = 1.17 kPa Substitute 800 kPa for P and 92 kPa for P a in Equation (II). P R = 800 kPa 92 kPa = 8.70 Substitute 1.17 kPa for P ν 1 and 8.70 for P R in Equation (III). P ν 2 = ( 1.17 kPa ) ( 8.70 ) = 10.2 kPa Substitute 10 .2 kPa for P ν 2 in Equation (IV). T dp = T sat@10 .2 kPa (V) Here, saturation temperature at pressure of 10 .2 kPa is T sat@10 .2 kPa . Refer Table A-5, “saturated water pressure table”, and write the saturation temperature corresponding to pressure of 10

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Chapter 14.7, Problem 117RP

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If there will be any condensation in the compressed-air lines on a day.

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Chapter 14.7, Problem 116RP

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If there will be any condensation in the compressed-air lines on a day.

Solution Summary: The author explains that there will be condensation in the compressed-air lines on a day. Express the vapor pressure of air before compression.

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