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 H_{2}O/kg dry air.

Step 1

Given in the problem:

Dry bulb temperature T is 25 ^{0}

Wet bulb temperature T_{w} is 17 ^{0}

Total atmospheric pressure is considered to be P_{atm}, where P_{atm }equals the sum of the partial pressure of dry air (P_{a}) and the partial pressure of water vapor (P_{v}).

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.

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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