What are the pressure of water and the dew point in a system in which the...

What are the pressure of water and the dew point in a system in which the relative humidty is 61.9% at 60 oC?

Pressure of water =

Dew Point =

The pressure of water vapor in the atmosphere is found to be 12.8 when it is 35 ^oC. What are the dew point and relative humidty?

Dew Point =

Relative Humidity =

Solutions

Expert Solution

Using August-Roche-Magnus approximation,

Td= (61.9/100)^(1/8) X (112+0.9x60)+0.1 x 60 -112 = 50.34 Deg.C

at T= 60 deg.C, air denisty = 0.93 kg/m3.

by ideal gas equation, P(air)= =0.93 x 287.058 x (273+60) = 88980 Pa

Total pressure = pressure of dry air+ partial pressure of water

101325 = 88980 + partial pressure of water

therefore, partial pressure of water = 12345 Pa

At T= 35 Deg.C & pressure of water vapor = 12.8 mmHg ( units assumed here), from psychometric chart, Relative humidity = 31% & moisture content = 11 gm /kg of air.

at moisture content = 11 gm /kg of air & relative humidity = 100%, temperature= dew point = 21.77 Deg.C

Amanda K answered 1 year ago

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