Heat Sterilization: Oper. Conds Tab

Variable Definitions, Ranges and Default Values

The following table shows a brief description of the variables appearing in this tab. The table also displays their default values and their generally acceptable range:

Variable	Default Value	Range

○ Sterilization Temp. (°C)	140	Positive
○ Preheat Outlet Temp. (°C)	110	Positive
○ Final Exit Temp. (°C)	35.0	Positive
● Heating Duty (kcal/h) The heat transfer rate of the heating agent.	0.0	Positive
○ Heating Agent Name Indicates the heating agent that is used in the reboiler. Click on the list box to bring up a list of available heating agents in order to select one.	<Steam>	Any Heating Agent
● Heating Agent In Temp. (^oC) The inlet temperature of the heating agent.	152.0	Positive
● Heating Agent Out Temp. (^oC) The outlet temperature of the heating agent.	152.0	Positive
● Heating Agent Rate (kg/h) The mass flow rate of the heating agent.	0.0	Positive
○ Heat Transfer Efficiency(%) The heating agent consumption efficiency. Specify a value below 100% to account for heat losses to the surroundings when a heating agent is used.	100.0	[0,100)
● Cooling Duty (kcal/h) The heat transfer rate of the cooling agent.	0.0	Positive
○ Cooling Agent Name Indicates the cooling agent used in the condenser. Click on the list box to bring up a list of available cooling agents in order to select one.	<Cooling Water>	Any Cooling Agent
● Cooling Agent In Temp. (^oC) The inlet temperature of the cooling agent.	25.0	Positive
● Cooling Agent Out Temp. (^oC) The outlet temperature of the cooling agent.	30.0	Positive
● Cooling Agent Rate (kg/h) The mass flow rate of the cooling agent.	0.0	Positive
○ Setup Time (min) The amount of time (per cycle) spent before each operation is carried in preparation for the actual execution of the operation. It may involve actions like cleaning, vacuuming, setting up of equipment, etc. which the user opted not to model explicitly.	0.0	Positive
◙ Process Time (min) The actual duration of the operation (per cycle).	240.0	Positive
○ Ignore Labor? Check this box to ignore labor for this operation. This option is used only if the process time is set by a master-slave relationship.	Yes	Yes/No
○ Sterilization Criterion, ln(No/N)	37.0	Positive
○ Ln(Frequency Factor) (1/s)	83.35	Positive
○ Activation Energy (cal/mol)	67,700	Positive
○ Fluid Viscosity (cP)	1.0	Positive
● Dispersion Coeff. (cm²/s)	0.0	Positive
● Specific Death Rate (1/s)	2.48	Positive
● Linear Velocity (m/s)	0.0	Positive
○ Reynolds Number	12,000.0	Positive
● Peclet Number	0.0	Positive
● Damkoehler Number	0.0	Positive
● Operating Throughput (m³/h)	0.0	Positive

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

Specification Choices / Comments

The following list describes the available specification choices in this tab; for more details on how these are implemented, see Heat Sterilization: Modeling Calculations.

The Sterilization Criterion variable is input in Design Mode and output in Rating Mode. The following variables are always output: Throughput, Dispersion Coefficient, Specific Death Rate, Linear Velocity, Reynolds Number, Peclet Number, and Damkoehler Number.

•Duration Options...

In Design mode you must either specify the process time (and the setup time) or match the duration of this operation to the duration of another operation by introducing a master-slave relationship. If you introduce a master-slave relationship, the program will match the setup time, the process time and the turnaround time of this operation (the ‘slave’) with the corresponding times of the reference operation (the ‘master’ operation). For more details on how to setup a master-slave relationship, see The Scheduling Tab. In Rating Mode, you can set the process time (and the setup time) or allow the process time to be calculated. The process time can either be calculated based on Throughput or on the Sterilization Criterion.