The cases below demonstrate how CLP develops
tailor-made energy efficiency solutions for different commercial
customers. These help them reduce electricity consumption in
their business operations and contribute to a greener environment.
A 24-hour Convenience Store
A Hotel
A Property Management Company
A Manufacturing Company
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| A 24-hour Convenience Store |
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As a convenience store operates 24 hours a day, air-conditioning
constitutes a major part of the total electricity consumption
in its daily business operations.
At the convenience store operated by the client, the existing
air-conditioner had been in use for over 10 years, with an
Energy Efficiency Ratio (EER) of 8.04 (the higher the EER,
the more energy-efficient the air-conditioner). The annual
electricity cost of air-conditioning was estimated at about
HK$40,000.
In view of the declining efficiency of the existing air-conditioner
after so many years in operation, the convenience store decided
to replace it with a new air-conditioner with a higher EER
to save energy.
The new energy-efficient air-conditioner has an EER of 9.86,
representing an over 22% improvement in cooling efficiency
and projected annual electricity cost savings of more than
20%.
Energy-efficient air-conditioners are more affordable today,
at prices comparable to those less efficient models. With
the new air-conditioner, the store saves energy and helps
conserve the environment.
| A Hotel |
|
A client owns a 5-star hotel with more than 500 guestrooms using
4,000 incandescent lamps of 60W each. The annual electricity
cost of these incandescent lamps was estimated at about HK$520,000.
Incandescent lamps are an inefficient light source. The large
amount of heat they generate will induce additional cooling
demands and thus increase the energy required for air-conditioning.
Therefore, the hotel decided to save energy by replacing the
existing incandescent lamps with Compact Fluorescent Lamps
(CFLs).
The CFLs consume only 11W each but generate the same lighting
intensity as incandescent lamps. One CFL costs about six times
that of an incandescent lamp, but saves more than 80% energy
and its lifetime is eight times longer.
The new lighting option is projected to achieve annual electricity
cost savings of more than 80%. Payback is achievable in only
four months.
CFLs generate less heat, therefore causing less additional
cooling demand compared with incandescent lamps. With the
use of CFLs, the hotel saves energy and helps conserve the
environment.
| A Property Management Company |
|
A car park managed by a property management company operates
24 hours a day. It was lit by more than 640 T8 energy-efficient
fluorescent tubes of 36W each, all driven by electromagnetic
ballasts. The annual electricity cost of lighting was estimated
at more than HK$220,000.
The company decided to replace the existing electromagnetic
ballasts with electronic ballasts to save energy while retaining
the same T8 energy-efficient fluorescent tubes.
At a cost of about five times the electromagnetic ballast,
an electronic ballast consumes only about 50% of the power
consumed by an electromagnetic ballast. The power consumption
of T8 energy-efficient fluorescent tubes can be further reduced
by 10% when used in association with electronic ballasts,
and the lifetime extended by 50%.
After the installation of electronic ballasts, annual electricity
cost savings of about 24% are projected. Payback in just over
a year is achievable.
By using electronic ballasts, the property management company
saves energy and helps conserve the environment.
| A Manufacturing Company |
|
The production line of a manufacturing company operates 24 hours
a day. For lighting, it used more than 2,800 conventional 65W
T12 fluorescent tubes and about 330 58W T8 energy-efficient
fluorescent tubes, all driven by electromagnetic ballasts. The
annual electricity cost of lighting was estimated at more than
HK$1.5 million.
To save energy, the manufacturing company decided to replace
the existing T12 fluorescent tubes and electromagnetic ballasts
with T8 energy-efficient fluorescent tubes and electronic ballasts
respectively.
An electronic ballast costs about five times as much as an electromagnetic
ballast, but consumes 50% less energy. A T8 fluorescent tube
costs about the same as a T12 fluorescent tube, but consumes
10% less energy.
The power consumption of T8 energy-efficient fluorescent tubes
can be further reduced by 10% when used in association with
electronic ballasts, and the lifetime extended by 50%.
After the change, annual electricity cost savings of about
28% are expected to be realised. Payback in just over a year
is achievable. Through the more energy-efficient installations,
the manufacturing company saves energy and helps conserve
the environment.
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