Mass flow rate of outside air through a duct is $735 \mathrm{~kg} \mathrm{~h}^{-1}$. Absolute humidity of air is $0.025 \mathrm{~kg}$ water vapour per $\mathrm{kg}$ dry air at $40^{\circ} \mathrm{C}$. This air is mixed with equal quantity of moist exhaust air coming out of a counter current dryer at $55^{\circ} \mathrm{C}$. The mixed air is heated up to $75^{\circ} \mathrm{C}$ to dry barley, fed at $174 \mathrm{~kg} \mathrm{~h}^{-1}$, at an initial moisture content of $31 \%$ (wet basis) to a final value of $7 \%$ (dry basis). The absolute humidity of the exhaust air from the dryer in 'kg water vapour per $\mathrm{kg}$ dry air' will be___________

Question ID - 156539 | SaraNextGen Top Answer

Mass flow rate of outside air through a duct is $735 \mathrm{~kg} \mathrm{~h}^{-1}$. Absolute humidity of air is $0.025 \mathrm{~kg}$ water vapour per $\mathrm{kg}$ dry air at $40^{\circ} \mathrm{C}$. This air is mixed with equal quantity of moist exhaust air coming out of a counter current dryer at $55^{\circ} \mathrm{C}$. The mixed air is heated up to $75^{\circ} \mathrm{C}$ to dry barley, fed at $174 \mathrm{~kg} \mathrm{~h}^{-1}$, at an initial moisture content of $31 \%$ (wet basis) to a final value of $7 \%$ (dry basis). The absolute humidity of the exhaust air from the dryer in 'kg water vapour per $\mathrm{kg}$ dry air' will be___________