Discrete Tray

Overview

	Size / Design Variable	Area
	Costing Variable (Built-in Model)	Area
	Costing Variable (User-Defined Model)	Area in m2
	Emissions Port	No
	Hosts	Batch Storage on a Tray (Discrete) Procedure

A Discrete Tray is used to represent an equipment resource typically used to host a vessel procedure to simulate storage of discrete entities. It is a tray on the surface which the entities are stored. The procedure can be executed in batch/semi continuous mode only.

Discrete Tray: Equipment Tab

The default maximum tray area is 5 m². See also Discrete Rack: Equipment Tab.

Sizing: Design Mode

In design mode, the user specifies the max volume, and the program calculates the number of units and volume based on the volume demand that is specified by the operations carried out as part of the (one or more) unit procedures hosted by the equipment resource. Typically, even during the span of a single procedure, more than one operations may demand different volumes. The software will size the vessel based on the largest demand on vessel volume amongst all operations executed in the vessel. If that volume exceeds the maximum volume specification then the software will assume multiple number of identical units, each with a volume that does not exceed the max volume specification, so that the total volume is equal to the demand.

For each operation, the operation’s demand on liquid volume is divided by the operation’s max allowable working to vessel volume ratio to determine the operation’s demand on vessel volume. The equipment’s max allowable working to vessel volume ratio acts as a constraint on the operation’s max allowable working to vessel volume ratio (i.e., the operation’s max working to vessel volume ratio must not exceed the equipment’s max working to vessel volume ratio).

For more information on the sizing of a Discrete Tray, see Batch Storage (Discrete, by Area): Modeling Calculations.

Sizing: Rating Mode

In rating mode, the volume of the vessel and the number of units are provided by the user. The program calculates exactly as in the design mode case the demand on vessel volume by the operations carried out as part of the unit procedure(s) hosted by the equipment resource, and if any the vessel volume demand of any operation exceeds the actual vessel volume, it generates a warning.

Costing

Equipment purchase cost is based on the tray area and material of construction. It is supplied by the built-in model assuming as material of construction SS316.