Drum 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

◙ Drum Area The total area of the drum.	15.0 m²	Positive
◙ Max Drum Area The maximum drum area that a unit of this type is available for purchase in the market	20.0 m²	Positive
◙ Drying Capacity rate The rate at which the material is evaporated.	1000.0 kg /h	Positive
○ Dryer Type The type dryer. Affects costing.	Atmospheric	Atmospheric/Vacuum

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./m2-h) and the system calculates the drum area by dividing the vapor mass flowrate by the evaporation rate. If the calculated drum area exceeds the maximum, multiple units are assumed that operate in parallel.

Sizing: Rating Mode

In User-Defined (Rating Mode), the user specifies the Number of Units and the Drum Area. The Drying Capacity is also specified and it is used to calculate the Equipment Capacity Utilization.

Costing

The equipment purchase cost is estimated using built-in correlations derived from vendor data. The equipment cost is a function of the dryer area with a minimum of 100.0 m².

For more information on this equipment, see Drum Dryer.

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