18.16. Psychrometric chart and equations. Air at 1atm,200F, and a relative humidity of 15% enters a direct-heat dryer. Determine the following from the psychrometric chart and/or relationships of Table 18.3: (a) wet-bulb temperature; (b) adiabatic-saturation temperature; (c) humidity; (d) percentage humidity; (e) saturation humidity; (f) humid volume; (g) humid heat; (h) enthalpy; and (i) partial pressure of water in the air