Psychrometry and Grain Drying

The approximate specific enthalpy of moist air is given by $h = 1.006 T + w(2501 + 1.86 T)\text{ kJ/kg dry air}$. For dry bulb temperature $T = 30^\circ\text{C}$ and humidity ratio $w = 0.015\text{ kg water/kg dry air}$, the enthalpy $h$ in kJ/kg dry air is: