Benefits for Office Building
• Reduce building energy consumption
and carbon emissions.
• Reduce operational cost of building
public systems.
• By applying the latest technologies,
not only will it save energy, but
it also increases the efficiency of
appliances
Benefits for Office Unit
• Improve energy consumption by the
office unit
• Reduce operational costs for the
office unit
• By applying the latest technologies,
not only will it save energy, but it
will increase the efficiency of the
appliances
Energy Saving Technology
Overview
Technology is always improving. We see that more and more new energy
efficient products are being launched into the market while the less
efficient systems faded out. For example, the typical centrifugal chiller
efficiency figure (measured in Coefficient of Performance COP) was
about 5.2 at the end of last century. Recently, the market requirement
was raised to 5.7. The same situation is also found in lighting technology
where fluorescent lamp efficiency (measured in “luminous efficacy”) has
nearly doubled from the previous T10 tube to the latest T5 tube.
The following list sets out some examples of the latest energy efficient
technologies which are applicable to office buildings/units.
Due to technological advancements, more and more technologies will
soon be available on the market. Stakeholders can consult professionals
on the detailed applications.
Office
UNIT
Office
BUILDING
Figure 3.3.4 Application of
photo sensor in office
Figure 3.3.5 Escalator with infra
red sensor for energy saving
HKGBC Benchmarking and Energy
Saving Tool - Office Buildings (HK
BESTOF)
(Since Nov 2015) – A certification
scheme and a web-based energy
benchmarking tool have been
developed to promote energy
efficiency for commercial buildings,
by providing a reference to building
owners and property management
companies.
HKGBC Benchmarking and Energy
Saving Tool – Office Occupants (HK
BESTOO)
(Since Nov 2013) – the Scheme and
a web-based energy benchmarking
tool have been developed to
promote energy efficiency and
recognise outstanding energy saving
performance by office occupants.
DESIGN STAGE
3.3.3 Energy Saving Technology
Energy Saving Technology for Office
Building
a. Lighting
• Energy saving lighting such as T5 or
LED in common areas
• Occupancy/photo sensors for lighting
control (see figure 3.3.4)
• Power over Ethernet (PoE) lighting
(for saving on cabling)
• Appropriate number of lighting
control zones
• Timer control for lighting
b. Heating, Ventilation and Air
Conditioning (HVAC) system
• Energy efficient air-conditioning
system
• High efficiency chillers with variable
speed drives
• Oil-free chillers with magnetic float
bearings
• Variable speed drives for motors of
Energy Saving Technology for Office
Unit
a. Lighting
• Energy saving lighting such as T5 or
LED
• Occupancy/photo sensors for lighting
control (see figure 3.3.4)
• Automated/time scheduled lighting
zones
• Use of task lights
b. Heating, Ventilation and Air
Conditioning (HVAC)
• VRV air conditioners
• Chilled ceilings/chilled beams
• DC motors for fan coil units
• CO
2
sensor controls on the amount
of fresh air supply
•
• Solar control window film
water pumps and fans
• VRV air conditioners
• Chilled ceilings/chilled beams
• DC motors for fan coil units
• CO
2
sensor control of the amount of
fresh air supply
• Heat wheels
• Optimisation in chiller sequencing
• Use of heat pumps for space heating
and hot water systems
• Total hydronic balancing in chilled
water systems
• VAV system static pressure reset
control
• Solar control window film
c. Lifts and Escalators
• Energy saving mode for lifts and
escalators (see figure 3.3.5)
• Lift parking mode during non-peak
hours
• Destination control system for lift
bank
• Application of power regeneration
d. BMS systems
• Provision of smart metering for
energy and water consumption
monitoring
Green strategies for Office Building
• Oil-free chiller with magnetic float
bearings
• High efficiency chillers with variable
speed drives
• Variable speed drives for motors of
water pumps and fans
• VRV air conditioners
• Heat recovery unit
• Energy saving lighting (such as T5
and LED)
• Occupancy sensors (for automatically
switching off light and A/C)
• Daylight sensors and dimmable
lighting ballast
• CO
2
sensor controls (minimise
excessive fresh air supply)
• Destination control system for lift
banks
• Escalator infra-red sensor (low speed
at non-peak hours)
• Automated lighting
• Lift parking mode during non-peak
hours
Green strategies for Office Unit
• VRV air conditioners
• Energy saving lighting (such as T5
and LED)
• Occupancy sensors (for automatically
switching off light and air
conditioning)
• Daylight sensors and dimmable
lighting ballast
• CO
2
sensor controls (minimises
excessive fresh air supply)
• Appropriate zoning of lighting
• Appropriate zoning of air side
systems with more thermostat
controls
DESIGN STAGE
3.3.3 Energy Saving Technology
Office
BUILDING
Office
UNIT
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