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Energy evaluation

Energy evaluation

Owned by Dag Barosen (Unlicensed)
Last updated: Dec 20, 2023 by Jon-Hallvard Eikeland
7 min read

Energy evaluation window

The energy evaluation window is accessible from bottom menu bar in the Project dialogue.

From this window you can setup energy evaluation parameters per luminaire type for each room, and get the resulting LENI factors immediately.

You can also create an energy evaluation report or export the data to the OptiWin XML format structure.

Read the sub-topics for a description of all the terms used in this window.

Active

With this function you can exclude rooms from the energy evaluation calculation.

Rooms without assigned luminaires will be shown but disabled in the list.

Name

The room name is the same as in the Room dialogue.

Expand the tree structure [+] to view the luminaries used in a room.

Category

Click on the pull down menu and select a building and room category that is closest to your room usage.

The selection is limited by the "Energy calculation" value set for the project.

Selecting a category will automatically fill in data for your calculation, e.g usage and absence factor.

These values can be overridden later in the evaluation:

Light On/Off

Central On/Off
There is a central switch which toggles the lights in several rooms.

Manual On/Off
The room has a local light switch.

Control function

Standard
The light can be switched either completely on or completely off.

corridorFUNCTION
Normally, motion sensors are combined with switchable control gear. This type of presence control results in either 100% light or 100% darkness.
See a description of the corridorFUNCTION below, or a demonstration at this web page (external link).

corridorFUNCTION

With the corridorFUNCTION there is no "hard off". Instead, the lighting is dimmed to a lower level and then switched off if necessary after a defined delay.

The corridorFUNCTION brings added security. Instead of being switched off abruptly if no movement is detected, the system is dimmed to a low light level and then switched off after a one minute delay. As soon as someone enters the room the light is switched back up to its full level.

The delay time can be set on the motion sensor. The "fade-off" time and the "NEVER-OFF" function are ECG functions.

Area (m2)

Floor area inside the outer walls excluding non-habitable cellars and un-illuminated spaces, measured in m2:

watt

Total effect (W) used for lighting in the room:

watt (Dimm)

Total effect (W), with respect to luminaire dimm percentage. Equivalent to watt when dimming is 100%.

watt/m2

Watt per Square Meter (W/m2):

Total

The total number of luminaires used in a room:

Function Controlled

This is the number of luminaires that uses the specified Control function.

Only luminaires with movement detectors can have a control function, which means that the number of function controlled luminaires cannot exceed the number of Auto luminaires.

If the room control function is set to Standard this will not have any impact.

Auto

The number of luminaires configured with a movement detector (On / Off).

Slave Auto

The number of luminares with a Slave unit and connected to a luminaire with the Auto unit.

At least one Auto unit must be present in the room before this can be configured.

Intelligent

The number of luminaires configured with daylight dimming and movement detector.

Slave Intelligent

The number of luminares with a Slave unit and connected to a luminaire with the Intelligent unit.

At least one Intelligent unit must be present in the room before this can be configured.

Emergency Light

The number of luminaires with built-in emergency function. This number is taken directly from the lighting calculation.

The emergency parasitic effect will be included in the calculation.

Usage day

Operating hours during daylight time, measured in hours (h).

The values will be automatically filled in when selecting a room category, but can be modified manually.

Usage night

Operating hours during night time, measured in hours (h). The values will be automatically filled in when selecting a room category, but can be modified manually.

Usage

This is the annual number of luminaire operating hours.

Usage Absence

The total number of hours of absence each year:

Absence factor

Factor relating to the period of absence of occupants.

Absence factor calculation

This can be used to automatically calculate an absence factor based on a regular 24 hour schedule.

Fill in the hours of absence (e.g lunch, meetings) and the ordinary usage each day.

Example: 8 hour work day with two meetings and lunch (11:30 - 12:00)

Daylight dependency factor

This is a factor relating the usage of the total installed lighting power to the daylight availability in the room or zone.

The daylight dependency factor depends on the following:

  • Maintained illuminance (Lux)

  • Location (Latitude)

  • Daylight penetration (e.g windows)

Daylight dependency factor calculator

The maintained illuminance should match the setting used when creating the room.

The Latitude can be found by entering the desired location in the search window and pressing "Search".

Note: the search will be executed through Google Earth, so you must be connected to the Internet to use this function.

 

The daylight penetration is a factor which depends on a large number of factors:

Some examples of such factors are the number of windows, their placement and tinting, which direction they are facing, and so on.

LENI Manual

This is the calculation of the LENI factor without any movement or daylight sensors.

LENI Auto

This is the LENI factor for luminaires fitted with movement sensors.

  • If a room is configured with Auto luminaires, this will be calculated from those luminaires.

  • If a room is configured with only Intelligent luminaires, they will be treated as Auto for this calculation.

  • If a room is configured without any Auto or Intelligent luminaires, this factor will be the same as LENI Manual.

LENI intelligent

This is the LENI factor for luminaires fitted with movement and daylight sensors.

  • If a room is configured with Intelligent luminaires, this will be calculated from those luminaires.

  • If a room is configured without any Intelligent luminaires, this factor will be the same as LENI Auto.

LENI Total

This is the resulting factor for the room, where all manual, Auto and Intelligent luminaires are combined into a single LENI factor.

  • If a room is configured with only Auto luminaires, this factor will be the same as LENI Auto.

  • If a room is configured with only Intelligent luminaires, this factor will be the same as LENI Intelligent.

  • If a room is configured without any Auto or Intelligent luminaires, this factor will be the same as LENI Manual.

% (savings)

This is energy savings percentage, comparing LENI Total with LENI Manual:

XML Export

This can be used to export all LENI data for the current project to a single XML file.

The XML data structure can be used for other applications.

 

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