6.2.6. Schedules

Detailed schedules are used in processes and as master control schedules for equipment.

A detailed schedule of operation is based on intervals of daily process running times that are assigned to a selection of weekdays to form weekly profiles. The weekly profiles are then assigned to different calendar date periods of a year. The result is a profile of process utilization as a percentage of nominal load for every hour of a year.

The scaling of the nominal load does not change process temperatures but scales flow rates and energy demands linearly. The scaling may exceed 100%.

6.2.6.1. Weekly Profiles

Weekly profiles are not project-specific but stored in a database for a possible use in different projects.

Weekly profiles can be edited in the Profile Editor, to be accessed

• via the main menu “Data Base” -> “Time Schedules (Profiles)”
• by right clicking on the profile selector pop-up menu (see section on operation periods below)

Profiles can be added / deleted by right-clicking on the table Double-click in order to edit a profile:

1. Add / Delete daily time intervals start:stop:scale by right-clicking in the correspondingn table
2. Select the weekdays for the daily profile (on/off)
3. Enter a unique descriptive name for the weekly profile
4. Save to your data base by clicking OK

6.2.6.2. Operation Periods

Weekly profiles are assigned to calendar date periods on the tab Schedule in the Process data section of EINSTEIN. A standard year starting and ending on Monday is assumed, so only the months and days of a period are taken into account.

The table of periods and associated schedules can be edited by clicking on the respective row or by inserting/deleting new rows with right-click of the mouse.

The start and stop date and the scale factor of a period can be directly edited in the table. Associated weekly profiles can be selected by clicking on the corresponding cell and selecting the desired weekly profiles in the pop-up window appearing

You should not create two periods with overlapping times of activity or use several weekly profiles with overlapping times of activity in the creation of a period.

Any time not covered by a period is considered to have a process activity of zero.

As an additional parameter, a holiday scaling factor can be defined:

• 0: no process operation during holidays
• <= 1: process operates at partial (< 1) or full load (=1) during holidays

Basicly the load of a process is its nominal energy demands times the product of the daily scale and the period scale times the holiday scale if it applies. The precise calculations behind the scheduling are documented in the Technical manual.