Modeling and Design of a Solar Rotary Dryer Bench Test for Phosphate Sludge

Table 3

Design parameters of the bench-scale rotary dryer.

Results of process design calculations	Code	Value	Unit
Internal diameter of the dryer		11.5	cm
Length of the dryer		1.5	m
Air inlet temperature		100	°C
Air inlet humidity		27.25	kg water/kg
Air inlet flow		27.25	kg/h
Air mass velocity		3975.55	kg/m²·s
Air outlet temperature		86.85	°C
Air outlet humidity		0.0558
Product outlet temperature		76.85	°C
Product outlet humidity		6	%
Evaporated mass		1.25	kg/h
Coefficient of heat transfer		1635.36	kJ/h·K·m^3
Logarithmic average of the temperature		108.76	°C
Overall heat consumption		4730.05	kJ/h