Sludge 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

◙ Evaporative Capacity Rate The rate at which the material is evaporated.	0.0 kg/h	Positive
◙ Max Evaporative Capacity The maximum evaporative capacity that a unit of this type is available for purchase in the market	18,000 kg/h	Positive

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

Sizing: Design Mode

In Calculate (Design Mode), the user specifies the Maximum Evaporative Capacity and the system computes the Number of Units and the Evaporative Capacity.

Sizing: Rating Mode

In User-Defined (Rating Mode), the user specifies the Number of Units, the Evaporative Capacity.

Costing

For costing purpose it is assumed, H₂O removed represents 80% of the total feed throughput. It was derived assuming a feed solids content of 5% and a dried sludge solids content of 35%. The equipment cost is a function of the evaporative capacity rate.

For more information on this equipment, see Sludge Dryer.

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