The air in a room has a pressure of 1 atm, a dry-bulb temperature of 24°c, and a wet-bulb temperature of 17°c. using the psychrometric chart, determine (a) the specific humidity, (b) the enthalpy, in kj/kg dry air, (c) the relative humidity, (d) the dew-point temperature, and (e) the specific volume of the air, in m3/kg dry air.

Given that

Dry-bulb temperature(T) =24°C

Wet-bulb temperature(Tw) = 17°C

Pressure ,P = 1 atm

As we know that  psychrometric chart are drawn at constant pressure.

From the diagram

ω= specific humidity

Lets take these two lines   Dry-bulb temperature(T) line and Wet-bulb temperature(Tw) cut at point P

From chart at point P

a)

Specific humidity,ω = 0.00922 kg/kg

b)

The enthalpy ( h)

h=47.59 KJ/kg

c)

The relative humidity, RH

RH= 49.58 %

d)

Specific volume ,

v= 0.853 m³/kg

c. newton's third law of motion