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 |
|
|
||
|
◙ Sigma Factor |
0.0 m2 |
Positive |
|
◙ Max Sigma Factor |
20,000 m2 |
Positive |
|
◙ Rated Throughput |
0.0 L/h |
Positive |
|
◙ Max Throughput |
9,000,000 L/h |
Positive |
|
○ Is Aseptic? |
Yes |
Yes/No |
Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output
The centrifuge can either be sized based on the Sigma Factor or the Throughput.
If sizing is based on Throughput then in Calculate (Design Mode), the user specifies the Maximum Solids Throughput and the system computes the Number of Units and the Rated Solids Throughput. In User-Defined (Rating Mode), the user specifies the Number of Units and the Rated Solids Throughput.
If sizing is based on Sigma Factor then in Calculate (Design Mode), the user specifies the Maximum Sigma Factor and the system computes the Number of Units and the Sigma Factor. In User-Defined (Rating Mode), the user specifies the Number of Units and the Sigma Factor.
In rating mode, if sizing is based on the Throughput user specifies the rated solids throughput. If it is based on the Sigma factor user specifies the sigma factor.
For more information on sizing of centrifuges, see Centrifugation: Modeling Calculations.
The equipment purchase cost is based on the rated throughput. By default it is calculated by the programs built-in model for a Decanter Centrifuge and the fact that it is aseptic or not affects the calculation of the purchase cost.
For more information on this equipment, see Decanter Centrifuge.
For information on the left-hand side variables and options, see Equipment Data Dialog: Equipment tab.