Air at $70^{\circ} \mathrm{C}$ and 0.015 humidity ratio is cooled adiabatically by spraying water. The final temperature of the air is $55^{\circ} \mathrm{C}$. Specific heat capacities of dry air and water vapour are 1.005 and $1.88 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$, respectively and latent heat of vapourization of water at $0{ }^{\circ} \mathrm{C}$ is $2501.7 \mathrm{~kJ} \mathrm{~kg}^{-1}$. The absolute humidity of the outlet air, in $\mathrm{kg}$ water vapour per $\mathrm{kg}$ dry air is

(A) 0.017

(B) 0.019

(C) 0.021

(D) 0.023

Air at $70^{\circ} \mathrm{C}$ and 0.015 humidity ratio is cooled adiabatically by spraying water. The final temperature of the air is $55^{\circ} \mathrm{C}$. Specific heat capacities of dry air and water vapour are 1.005 and $1.88 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}$, respectively and latent heat of vapourization of water at $0{ }^{\circ} \mathrm{C}$ is $2501.7 \mathrm{~kJ} \mathrm{~kg}^{-1}$. The absolute humidity of the outlet air, in $\mathrm{kg}$ water vapour per $\mathrm{kg}$ dry air is

(A) 0.017

(B) 0.019

(C) 0.021

(D) 0.023

1 Answer - 5876 Votes