Energy Conservation in Hotels
If the HVAC system is
being upgraded or replaced, the lighting system,
too, should be reviewed and the loads attributed to
lighting recalculated. When the air conditioning
system is optimized, the air conditioning loads will
be calculated based on existing lighting systems.
If a hotel plans to upgrade the lighting, it’s best
to do so at the time of the HVAC retrofit, since, as
explained on the HVAC page, the lighting and HVAC
systems have such a large effect on each other.
Innovation and continuous improvement in the field of
lighting have given rise to tremendous
energy-saving opportunities. Lighting is an area in
which there is enormous energy-efficiency potential,
starting at the design stage by incorporating modern
energy-efficient lamps and luminaires. Following
responsible operational practices also can
significantly reduce lighting-associated energy
Lighting is not only a very high
priority when considering hotel retrofitting, it is
also a high-return, low-risk investment. By
installing new lighting technologies such as
dimmers, photosensors, occupancy sensors, and
timers, hotels can reduce the amount of electricity
consumed and energy costs associated with lighting.
There are several types of energy efficiency
lighting and affordable lighting technology, such as
compact fluorescent lights, light-emitting diodes (LEDs),
and lighting controls. Below are just a few examples
of energy-saving opportunities with efficient
of energy-efficient fluorescent lamps in place
of "conventional" fluorescent lamps—for example
T8 and T5 (T12s to T8s in developing countries).
compact fluorescent lamps (CFLs) in place of
high pressure sodium vapor (HPSV) lamps for
applications where color rendering is not
critical. Mercury vapor lamps should also be
LED exit signs to replace incandescents.
Optimum usage of
day-lighting in new designs.
high frequency (HF) electronic ballasts in place
of conventional ballasts.
occupancy sensors, a cheap way to ensure that
unneeded lights do not remain on.
photocells, devices that automatically detect
the natural light level in a room and adjust the
intensity of the artificial light accordingly.
device, such as a key tag system, will improve
housekeeping energy management. This measure
will help improve the load factor in the
electrical system. With a key-card system, only
occupied rooms consume energy, as most
electrical appliances are switched off when the
key-card is removed. This will reduce the load
when guest presence in the rooms is low.
incandescent wall lights and exit sign lighting
with CFL or LED-lit units will not only save a
considerable amount of energy, it will also
significantly reduce labor costs associated with
changing light bulbs, since CFLs and LEDs last
much longer than incandescent bulbs.
Whenever a hotel is undergoing renovations,
hotel managers should consider incorporating
daylighting tactics and integrating electric
lighting systems appropriately.
the Alliance to Save Energy
Lighting page for
ASHRAE Standard 90.1, American Society of
Heating, Refrigerating, and Air-Conditioning
Engineers, Atlanta, GA.
Energy Star. Commercial Lighting.
The Illuminating Engineering Society of North
America, New York, NY. (212) 248-5000.