The dry- and wet-bulb temperatures of atmospheric air at 92.5 kPa are 25°C and 17°C, respectively. The specific heat at constant pressure is 1.005 kJ/kg·°C. Use data from the tables. Solve using an appropriate software.Determine the specific humidity. (You must provide an answer before moving on to the next part.) The specific humidity is __________kg H2O/kg dry air.

Question
Asked Apr 25, 2019

The dry- and wet-bulb temperatures of atmospheric air at 92.5 kPa are 25°C and 17°C, respectively. The specific heat at constant pressure is 1.005 kJ/kg·°C. Use data from the tables. Solve using an appropriate software.

Determine the specific humidity. (You must provide an answer before moving on to the next part.)

 

The specific humidity is __________kg H2O/kg dry air.

check_circleExpert Solution
Step 1

Given in the problem:

Dry bulb temperature T is 25 0

Wet bulb temperature Tw is 17 0

Total atmospheric pressure is considered to be Patm, where Patm equals the sum of the partial pressure of dry air (Pa) and the partial pressure of water vapor (Pv).

 

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Step 2

Using the standard tables of water, the saturation pressure of water at a temperature of 17 0 can be found using the linear interpolation as shown in equation 1.

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Step 3

Use the Apjohn equation to find the partial pressure of water vapor (Pv) by using the values of temperature and saturatio...

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