Environmental Performance
20
Hopewell Holdings Limited
Sustainability Report 2010/11
Case Study (1):
Sustainability Begins with
Design
Hopewell Centre is the Group’s flagship property, with 66 storeys of
office space, a shopping arcade and car parking facilities. Its facilities
and services are continuously enhanced and more than HK$140
million was invested in refurbishment programmes over the past
10 years. Hopewell Centre obtained ISO 14001 certification for its
approach to environmental management in 2008.
Energy Efficiency in Design and Office
management
Hopewell Centre was one of the very few Hong Kong buildings
constructed in the 1980s to be recognised for its “Good Energy
Performance” under The Hong Kong Energy Efficiency Registration
Scheme for Buildings launched by the Electrical and Mechanical
Services Department. This was made possible as environmental
considerations were taken into account at the design and
construction stages.
Design features to enhance efficiency include:
• A circular design complemented by the column free structure
which ensures layout, materials and energy efficiency are
maximised. The circular shape ensures heat is not absorbed
• The structural wall system which allows better solar heat
reflection
• An air-conditioning system using primary and secondary
circuit systems which results in energy savings
Recent building enhancement work was performed to improve the
energy efficiency of Hopewell Centre through the application of
energy saving solutions. The investment leads to cost savings over
time: Hopewell Centre’s electricity cost is HK$1 per sq. ft. compared
to HK$1.7 per sq. ft. in other buildings. The implemented energy
saving initiatives led to savings of HK$1.4 million despite increased
electricity tariffs.
Energy saving retrofit initiatives include:
• Replacement of existing lighting in office towers with fluorescent
tubes and LED light tubes of lower power consumption leading
to energy savings ranging from 20% to 30%
• Adoption of energy efficient LED lighting for all common areas
• Conversion of the air-conditioning system from air-cooled to a
water cooled system
• Retrofit of the chiller plant to increase efficiency and reduce
power consumption during part-load operation
• Upgrade of elevators’ drives and motors
• Installation of sensor automatic controls for the lighting system
We realise that significant energy savings can be achieved through
simple operational changes, such as increasing the chilled water
temperature in the air-conditioning system from 5.5
o
C to 7
o
C,
reducing the water flow rate at low-peak hours. These measures
were the main source of the 2.8% or 445MWh energy consumption
reduction in 2010/11 compared to 2009/10.
2002/03
2006/07
2004/05
2008/09
2003/04
2007/08
2005/06
2009/10 2010/11
17657.64
17719.9
16582.82
17178.35
17738.95
16135.93
15690.87
19385.6
19957.2
Hopewell Centre Energy Consumption (MWh)