Air at $\backslash (33^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )$ dry bulb and $\backslash (19^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )$ wet bulb temperatures are cooled and humidified by passing it through an air washer where the water is continuously recirculated. The air leaves the air washer at $\backslash (23^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )$ dry bulb temperature.

Determine:

a$)$ the moisture added per kg of dry air.

b$)$ the efficiency of the air washer