DAYSIM Header File Deyword: Electric Lighting System

This is a required header file keyword to configure the Electric Lighting Module in DAYSIM. The module allows users to model annual electric lighting use in up to ten independently controlled lighting zones. The resulting lighting schedules are saved in an internal gains schedule file that can be linked with energy simulation programs such as EnergyPlus of DOE2.1. A number of different lighting control options are available. The options can be devised into two category. In the first category DAYSIM assumes an 'ideal lighting system'. In this case the electric lighting system itself is actually not being modeled but instead the daylight in the space is modeled. For this simpler option the only parameter required to describe the lighting system for each zone  is the installed lighting power and the target illuminance. It is assumed that the lighting system will deliver this target illuminance when fully switched on. The second set options called Actual Lighting System (which is not supported, yet) will allow users to model the luminaires within RADIANCE/DAYSIM. Both type of electric lighting descriptions can be used complementary in DAYSIM. The basic keyword syntax is:

Syntax

electric_lighting_system n
   m_1 ...
   m_2 ...
   m_n...

where n is an integer under 10 that defines the number of lighting zones

      m is an integer that the defined the type of lighting control used in each zone

Ideal Lighting System Controls

Lighting controls m=1 to 6 characterize ideal lighting systems. The following lighting control scenarios are supported:

  • manual control (m=1): This lighting system corresponds to a standard manually controlled electric lighting system with a single on/off switch near the door. According to chapter 27 of the IESNA Lighting Handbook, this is the reference system relative to which the energy savings potential of automated controls should be expressed. DAYSIM uses the Lightswitch Model to minim mimic manual use of electric lighting and shading controls.

Syntax

electric_lighting_system 1
   1 <descriptive_string> <lighting power in Watt> 1

  • energy-efficient (off) occupancy sensor (m=2): This lighting system corresponds to the reference lighting system combined with a perfectly located occupancy sensor with a user-specified switch-off delay time, i.e. a time that the systems waits before switching off the electric lighting once no   in minutes that . The lighting system can only be activated manually through the switch. It is switched off either manually by the user or automatically by the occupancy sensor. The occupancy sensor consumes a user-specified standby power when the lighting system is switched on.

Syntax

electric_lighting_system 1
   2 <descriptive_string> <lighting power [W]> 1 <standby power [W]> <delay time [min]>

  • on/off occupancy sensor: This lighting system corresponds to an automatically controlled lighting system with an ideally located occupancy sensor with a user-specified switch-off delay time. The occupancy sensor is permanently in standby mode and activates the lighting whenever occupancy is detected. The occupancy sensor permanently consumes a user-specified standby power.

Syntax

electric_lighting_system 1
   3 <descriptive_string> <lighting power [W]> 1 <standby power [W]> <delay time [min]>

  • photo-sensor-controlled dimming system: This lighting system corresponds to an ideally commissioned, photo sensor-controlled, dimmed lighting system. The photocell dims the activated lighting until the total work plane illuminance  (daylight & electric light) reaches the target illuminance. At a minimum lighting output of 1% the system consumes a user specified minimum electric dimming level of its full electric power. The lighting is manually activated via a single on/off switch near the door. The photocell consumes a standby power of 2W.

Syntax

electric_lighting_system 1
   4 <descriptive_string> <lighting power [W]> 1 <standby power [W]>

      <minimum electric dimming level [%]> <target illuminance [lux]>

  • dimmed lighting system with an energy-efficient occupancy sensor: This lighting system corresponds to an ideally commissioned, photo sensor-controlled, dimmed lighting system combined with an on/off switch and a perfectly located occupancy sensor. The occupancy sensor has a user-specified switch-off delay time. The photocell dims the activated lighting until the total work plane illuminance (daylight & electric light) reaches the target illuminance. At a minimum lighting output of 1% the system consumes a user-specified minimum electric dimming level of its full electric power. The lighting system can only be activated manually through the switch. It is switched off either manually by the user or automatically by the occupancy sensor. The lighting control module  consumes a user-specified standby power of when the lighting system is switched on.

Syntax

electric_lighting_system 1
   6 <descriptive_string> <lighting power [W]> 1 <standby power [W]>

      <minimum electric dimming level [%]> <target illuminance [lux]> <delay time [min]>

  • dimmed lighting system with an energy-efficient occupancy sensor: This lighting system corresponds to an ideally commissioned, photo sensor-controlled, dimmed lighting system combined with an on/off occupancy sensor with a user-specified switch-off delay time. The photocell dims the activated lighting until the total work plane illuminance (daylight & electric light) reaches the target illuminance. At a minimum lighting output of 1% the system consumes a user-specified minimum electric dimming level of its full electric power. The occupancy sensor is permanently in standby mode and activates the lighting whenever occupancy is detected. The occupancy sensor permanently consumes a user-specified standby power.

Syntax

electric_lighting_system 1
   5 <descriptive_string> <lighting power [W]> 1 <standby power [W]>

      <minimum electric dimming level [%]> <target illuminance [lux]> <delay time [min]>

Example

An electric lighting system consisting of two lighting groups. The first system is a manually operated photocell controlled dimming system with an installer power of 100W, a standby power of 2 W a minimum electric dimming level of 20% and a target illuminancne of 300lux. The second system is manually controlled and has an installed lighting power of 100W.

electric_lighting_system 2
   4 manual_dimming    100 1 2 20 300
   1 manual_control    200 1

 

Actual Lighting System Controls

Coming in Spring 2013.

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