CALCULATION METHODOLOGY FOR THE ADVANCED LIGHTING CONTROL SYSTEMS (ALCS) ENERGY SAVINGS CALCULATOR TOOL
With recent developments in solid state lighting driving
much of the current interest in lighting upgrades in
existing building, utility programs and codes are
beginning to promote advanced lighting controls along
with lighting upgrades to ensure that the energy benefit
from the investment is maximized. To promote
advanced lighting controls in utility programs, a new
‘Advanced Lighting Controls Systems’ (ALCS) energy
savings calculator tool has been developed, with
funding from Pacific Gas & Electric (PG&E), and
DesignLights Consortium (DLC). This Excel based
calculator allows users easy access to customized
calculation of energy savings from lighting controls for
their projects, thus removing a key barrier in promotion
of lighting controls technology.
For the development of the ALCS Calculator, a new
savings calculation methodology was developed that
uses the concept of hourly energy use profiles for
typical days of a year, and savings control factors.
Using this methodology, annual energy and demand
savings can be calculated for any commercial building
project with different lighting control types, or ‘modes’.
The calculation approach accounts for interaction
between various lighting control modes applied in a
This paper provides a technical overview of the
calculation methodology developed for the ALCS
Calculator Tool and discusses key concepts of the tool’s
new calculation approach.
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