Lighting System Audit
This is a good place to say a few words about lighting energy audit. As we said at the beginning
of this section, lighting systems account for a major portion of electricity use in buildings, and
have received much attention recently due to the energy and sustainability concerns. A light-
ing energy audit starts with space classification. That is, what is the space used for? Is it used as
an office, warehouse, manufacturing plant, and so on. Next, an energy auditor determines the
space characteristics (length, width, height), the light fixtures (lamp types, their number, and
lamp wattage), and their controls. The auditor then talks to the users about the lighting level,
their tasks, occupancy profile, and using a light meter measures the light level in the space.
Then, the comparison between the measurements and the Illuminating Engineering Society
(IES) recommendation values for a given task is made. The auditor also calculates power con-
sumption of the lighting system per unit area (watts /ft
2
) and compares it to design guidelines.
Finally, the energy auditor prepares a report discussing his findings including estimate of annual
lighting energy cost and ways by which the energy consumption due to lighting system may be
reduced (for example, by reducing illumination levels, taking advantage of daylighting, or
increasing the efficiency of lighting systems). Problems 12.34 and 12.35 are intended to give
you hands-on experience with these lighting energy audit steps.368 Chapter 12 Electric Current and Related Parameters
J. Duncan Glover, Ph.D., P.E.
My career in electrical engineering began
with a keen interest in mathematics
and the challenges of solving technical
problems. But I also wanted to apply my
technical abilities towards practical appli-
cations and technologies that would be
useful to society, which led me to earning a B.S., a M.S.,
and a Ph.D. in Electrical Engineering.
Over the years I’ve worked for various companies,
including a two-year assignment in Rio de Janeiro, Bra-
zil as a consulting engineer on a large hydroelectric proj-
ect. I also taught and performed research in electrical
engineering for fifteen years at Northeastern University,
first as an Assistant Professor and later as a tenured Asso-
ciate Professor. But in 2004 I founded my own com-
pany, Failure Electrical, LLC.
I started the company after spending many years
investigating a wide and diverse array of electrical and
electronic equipment failures, including explosions,fires, and injuries. I now team up with cause and origin
investigators, mechanical engineers, thermal experts,
and other engineering specialties to provide a multi-
disciplinary approach to solving complex technical
problems.
Failure Electrical is rather like the CSI of electrical
engineering, investigating what went wrong, why, and
what can be done to prevent a reoccurrence.
By specializing in issues pertaining to electrical
engineering, as they relate to failure analysis of electri-
cal systems, subsystems, and components, (including
causes of electrical fires) I cover investigations of the fol-
lowing: electric utility service interruptions and black-
outs; heavy equipment failures including generators,
transformers, circuit breakers, and motors; electrocu-
tions; consumer appliance failures; and failures of semi-
conductors including printed circuit boards.
There are so many avenues to explore in my field;
I’ve been fortunate in being a part of so many of them.Professional Profile
Source:Courtesy of John Duncan Glover
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