Vertical Dryer: Equipment Tab

Variable Definitions, Ranges and Default Values

The following table shows the meaning of the variables appearing in this tab, as well as their default values and their generally acceptable range. Note that due to the manner by which the variables are used by the sizing and costing equations, the range of acceptable values may be further reduced.

Variable	Default Value	Range

◙ Diameter The diameter of the dryer.	0.0 m	Positive
◙ Max Diameter The maximum diameter that a unit of this type is available for purchase in the market	10.0 m	Positive
◙ Height The height of the dryer vessel.	0.0 m	Positive
◙ Height/Diameter The ratio of height to diameter (aka aspect ratio) of the vessel.	3.0	Positive
◙ Drying Capacity rate The rate at which the material is evaporated.	1000.0 kg /h	Positive
● Volume The total volume of the dryer.	0.0 L	Positive.

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Sizing: Design Mode

In Design Mode, the user specifies the evaporation rate (in kg evap./m3-h) and the system calculates the vessel volume by dividing the vapor mass flowrate by the evaporation rate. The Height/Diameter ratio is used to calculate the height and diameter of the vessel. If the calculated diameter exceeds the maximum, multiple units are assumed that operate in parallel.

Sizing: Rating Mode

In Rating Mode, the user specifies the dryer dimensions and the system calculates the evaporation rate.

Costing

The equipment purchase cost is estimated using built-in correlations derived from vendor data. The equipment cost is a function of the drying capacity with a minimum of 36.0 kg/h.

For more information on this equipment, see Spray Dryer or Fluid Bed Dryer.

For information on the left-hand side variables and options, see Equipment Data Dialog: Equipment tab.