DAYSIM Header File Keyword: Occupancy Profile

User occupancy in the office can be specified through the arrival and departure time on week days. Based on these quantities, DAYSIM uses a stochastic model  to generate an annual occupancy profile (see references: Reinhart 2001). 


  • Please note: An arrival time of 8.25 corresponds to 8.15 AM; a departure time of 16.5 corresponds to 4.30PM

Model Assumptions

  • The model assumes that the work place is only occupied on weekdays, i.e. Monday to Friday.
  • The user arrives and leaves for the day within a plus/minus 15 minutes time window with respect to the input arrival and departure times.
  • If the working day is less than 3 hours long, the user leaves the work place once  for a 15 minute break.
  • If the working day is between 3 and 6 hours leaves, the user leaves the work place twice for 15 minute breaks.
  • If the working day is longer than 6 hours, the user leaves for two 15 minute breaks and a 60 minute lunch break.
  • Daylight savings time start on April 1st and ends on October 31st. Example

The figure below shows the simulated probability on a week day for an arrival time of  8.00 and a departure time of 18.00. The lunch break occurs at noon and the two 15-min breaks are scheduled around  10.00 and 15.00. Occupancy profiles generated by the Lightswitch Wizard are higher than a profile one would measure in most real work places as neither holidays, vacation days, sick leaves or business trips are being considered.



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