Hui, S. C. M., 2000. Building energy efficiency standards in Hong Kong and mainland China, In Proc.
of the 2000 ACEEE Summer Study on Energy Efficiency in Buildings, 20-25 August 2000, Pacific
Grove, California.
Building Energy Efficiency Standards in Hong Kong and Mainland
China
Sam C. M. Hui, Department of Architecture, The University of Hong Kong
ABSTRACT
This paper investigates building energy efficiency standards in Hong Kong and
mainland China. Building energy regulations are placed in the context of broad trends in
energy supply and demand, and of energy policy. The paper offers an overview of the
requirements of specific energy-efficiency laws and codes for buildings, and discusses how
these requirements affect building design. While its fundamental economic policy approach
emphasizes free markets and minimum government intervention, Hong Kong has
developed building energy codes for commercial and other buildings largely in response to
the energy and environmental concerns. Mandatory code for building envelope was
enforced since 1995; energy codes for building services were developed and implemented
on a voluntary basis in recent years. Performance-based compliance options and better
integration of the codes are needed for future development.
As one of the world's most rapidly developing economies, China has a large impact
on the world energy market and the global environment. Measures to improve energy
efficiency in China's buildings are urgently needed since the number of new buildings is
growing rapidly and people are requesting better living standards. Use of energy standards
is likely to grow in China and programmes that complement and enhance the standards are
expected to come in the future. Since As a major city of China, Hong Kong could play an
important role in enhancing technology transfer and demonstration for energy-efficiency
improvements. The result of these efforts will have long-term implications for the social
and economic development of the Asian region and the world.
Introduction
Building energy efficiency standards and regulations are policy measures widely
used to control energy consumption in buildings (Janda and Busch 1994). It can help
overcome some of the significant market barriers and ensure that cost-effective energyefficiency opportunities are incorporated into new buildings. This is especially important in
developing countries where the number of new buildings is growing rapidly and the energy
prices and market often do not encourage the use of efficient technologies. Research by
Nadel (1997) showed that trends towards increased use of efficiency standards are likely
to continue, along with periodic updates to standards and growth in programmes that
complement them.
Development of building energy efficiency standards has been an important issue in
Hong Kong and mainland China in the past two decades (Hui 1997a). As energy
consumption in buildings accounts for a significant portion of total societal energy
requirements and is growing very fast, the potential for energy saving in the building sector
is tremendous. As one of the world's most rapidly developing economies, China has a large
impact on world energy market and the global environment. As China is likely to maintain
rapid rates of economic growth in the 21st century, the strategy for providing energy
services and ensuring efficient use of energy is very important for China and the world.
This paper investigates building energy efficiency standards in Hong Kong and
mainland China. The paper places building energy regulations in the context of broad
trends in energy supply and demand, and of energy policy in both Hong Kong and
mainland China. It also offers an overview of the requirements of specific energy-efficiency
laws and codes for buildings, and discusses how these requirements affect building design.
Situation in Hong Kong
Hong Kong is a highly developed city with extremely high building density. With
growing concerns about energy and the environment, Hong Kong has been working hard
in the past decade to develop energy-efficiency programmes and building energy codes
(Hui 1999; Lam and Hui 1996).
Building Energy Consumption
Since the oil crises in the 1970s, Hong Kong has begun to study the issue of energy
conservation in buildings by developing some basic concepts and guidelines. In the 1980s
and early 1990s, as Hong Kong was undergoing an economic transformation from a
manufacturing to a services center, energy use by the manufacturing sector was declining
and building-related energy consumption in the residential sector and especially the
commercial sector was increasing steadily. Figure 1 shows the sectoral breakdown of enduse energy in Hong Kong for 1984-96 (EMSD 1999).
100
Transport
Commercial
Energy 80
end-use
('000 TJ) 60
Industrial
40
Residential
20
0
84 85 86 87 88 89 90 91 92 93 94 95 96
Year
Figure 1. Sectoral breakdown of end-use energy in Hong Kong, 1984-96
Nowadays, energy use in buildings represents a major portion of the community's
energy demand, especially for electricity. In 1998, the building sector (commercial and
residential) accounts for 85% of electricity consumption and over 33% of final energy
requirements (CSD 1999). Table 1 shows the final energy requirements in Hong Kong in
1998.
Table 1. Analysis of final energy requirements in Hong Kong, 1998
Unit: Terajoule
Commercial
Residential
Industrial
TOTAL
Electricity
74 164 (59%)
32 793 (26%)
18 489 (15%)
125 447 (100%)
Gas
10 536 (44%)
12 519 (52%)
888 (4%)
23 943 (100%)
84 700
45 312
19 377
149 390
Electricity + gas
21.7%
11.6%
5.0%
Percentage *
Note: * Percentage of (electricity + gas) in the final energy requirements.
38.2%
Electricity and town gas are the major forms of energy supply in buildings and their
consumption in the commercial and residential sectors represents almost the total energy
use of the building sector. It can be seen from Table 1 that commercial buildings constitute
26.7% of the final energy requirements and residential buildings account for 14.1%. As the
energy use in commercial buildings is the most significant sector in Hong Kong and is
growing faster than other sectors, much of the energy-efficiency effort targeted at energy
savings in commercial sector. This is different from many other countries which usually
focus first on the residential sector.
Overall Energy Policy
Hong Kong Government has a fundamental economic policy of minimum
interference in the business sector. That means market forces determine the allocation of
resources and the Government intervenes only when there are over-riding social
considerations. Over the past decades, this policy has shaped the development of Hong
Kong's energy sector, in that it is the private sector that supplies energy of all forms to
meet market requirements; regulation of the energy sector is relatively light-handed.
In recent years, international concern over global warming and local concern over
air quality have resulted in a greater focus on the environmental impact and efficiency of
energy production and use. Considerable emphasis is now being placed on the
development of strategies for sustainable development, involving the balance of economic,
environmental and social considerations, and development of more environmentally
friendly forms of energy production. The Government's general energy policy is to:
(a)
ensure that the energy needs of the community are met reliably, efficiently, safely
and at reasonable prices; and
(b)
promote the efficient use and conservation of energy and the minimization of the
environmental impact of energy production and use.
For energy-efficiency activities in Hong Kong, the 1990s were a period of
fundamental change in policy instruments and agency responsibilities (Lam 1998). For
example, the Energy Efficiency Advisory Committee was set up by the Government in
April 1991 (it was later transformed into the Energy Advisory Committee in June 1996 to
cover a wider scope of energy matters) and the Energy Efficiency Office, the government's
technical agency, was established in August 1994. A number of tools and programmes
have been implemented to encourage energy awareness (Hui 1999). All evidence indicates
that government action is important for promoting efficient use of energy that will help
optimize the energy resources and systems in the community.
Building Energy Codes and Regulations
Building (Energy Efficiency) Regulation (Hong Kong Government 1995), which
came into operation on 21 July 1995, is the first set of legislation in Hong Kong to control
energy-efficient design in buildings. It specifies statutory control on the design of building
envelope of new commercial and hotel buildings by using the overall thermal transfer value
(OTTV) method (Building Authority 1995). Lam and Hui (1996) have reviewed and
analyzed the method, which is also being used in some Southeast Asian countries such as
Singapore, Malaysia, Philippines and Thailand. It was found that the OTTV method
emphasizes the control of solar heat gain and is applicable, in principle, to warmer climatic
regions of the world which have large energy requirements for air-conditioning. As
compared with some comprehensive building energy standards which adopt a wholebuilding energy budget approach, the OTTV method is easier to understand and simpler to
implement. This is an important criterion for developing countries which do not have
enough experience and proficiency to manage complicated energy codes.
Nevertheless, the OTTV method is prescriptive in nature and has been criticized
for restricting design freedom and innovation in architecture (HKIA 1992). The OTTV
method only deals with the building envelope and does not consider other aspects of
building design (such as lighting and air-conditioning) and the coordination of building
systems to optimize the combined performance. The use of OTTV as the only control
parameter is inadequate and cannot ensure energy is used efficiently in the building (Hui
1997b). It is believed that 'real' energy savings arising directly from the Hong Kong OTTV
standard were limited, although it did help to raise concern and awareness of energyefficiency issues.
Apart from the building envelope standard, four sets of energy efficiency codes of
practices for building services design have been prepared during the past two years
(EMSD 1998a & b, 1999a & b). Table 2 shows the current status of the building energy
codes. These energy codes were implemented initially on a voluntary basis, but they will be
examined whether they should be put on a mandatory basis in the coming years. To gain
the support of all concerned parties, seminars have been held to introduce the codes to
building professionals. Supplementary guidelines for lighting and air-conditioning
installations have also been published to explain the requirements of the codes and
promote better energy efficiency in the operation and maintenance of existing buildings
(EMSD 1998c & d).
Table 2. Building energy codes in Hong Kong
Area of concern
Building envelope
(OTTV)
Lighting
Date
implemented
July 1995
Status
Scope
Mandatory
Commercial buildings and hotels
July 1998
Voluntary
All buildings except domestic,
industrial and medical ones
Air-conditioning
July 1998
Voluntary
All buildings except domestic,
industrial and medical ones
Electrical services
February 1999
Voluntary
All buildings except for special
industrial process
Lifts and escalators
mid-2000
Voluntary
All buildings except for special
(expected)
industrial process
Note: Full text of the codes can be found at http://arch.hku.hk/research/BEER/.
To encourage wider acceptance of the building energy codes, a scheme of
accreditation for energy efficient buildings has been introduced in late 1998. Under this
scheme, any buildings (new and existing) that fully complies with the codes will be eligible
for accreditation as an energy efficient building. A certificate of accreditation will be issued
to the building's owner and its name entered into a register kept by the Government. The
aim of the scheme is to arouse public awareness and stimulate greater interests in energy
efficient buildings. An energy-efficiency building award, held in 1994 and 1997 in Hong
Kong, also serves similar functions for drawing attentions from the public and the
professionals.
Other Related Activities
An energy-efficiency labelling scheme for electrical appliances has been
implemented in Hong Kong since 1995 to provide consumers and decision makers with
information on opportunities for energy efficiency. The aim of the scheme is to promote
classes of products that save energy, create differentiation among products, and allow
consumers to make an educated purchase. At present, four types of electrical appliances
were put under this scheme including household refrigerators, room coolers (unitary airconditioners), washing machines, and compact fluorescent lamps. It is believed that the
scheme has indirect impacts on the energy efficiency of residential buildings where these
appliances are commonly used.
In association with an initiative for demand-side management (DSM) for
electricity, the Government is considering programmes to promote high efficiency
appliances and thermal storage air-conditioning systems, through rebates to the consumer
from the power company which collects DSM incentive earnings from the Government. If
this is implemented, financial incentives will be provided for improving energy efficiency of
appliances and buildings. At the same time, the DSM measures will help reduce peak
demand for electricity and longer term growth in demand, enabling the community to
postpone or avoid construction of additional generating capacity.
To improve energy efficiency of existing buildings, energy audits have been
conducted in government buildings since 1993 and measures have been implemented to
achieve energy savings in these buildings. Information on retrofitting existing buildings
with energy-efficient equipment is being disseminated to the private sector. The
Government is also examining the potential for wider use of water-cooled air-conditioning
systems (which could produce electricity savings of 20-30%) for non-domestic
developments, in order to raise the efficiency of air-conditioning plants.
To provide information and analytical tools for evaluating the costs, benefits and
likely impacts of alternative policies, an energy end-use database has been developed in
1998 (EMSD 1999c). The database comprises a set of aggregate energy end-use statistics
classified into the four energy sectors in Hong Kong, namely residential, commercial,
industrial and transport. It provides essential information for formulating government
policies and understanding the energy saving potential in different sub-sectors.
Situation in mainland China
China has been experiencing a dramatic shortfall in energy and the scarcity of
energy sources is a major issue in China's socio-economic development. In the 1980s,
China actively promoted energy efficiency (primarily in heavy industry) to partially
decouple energy and economic growth (Sinton, Levine & Wang 1998). As a result, the
elasticity of energy consumption to gross domestic product (GDP) has declined
significantly from 2.09 in 1953-1980 to 0.56 in 1981-1990. Although substantial success
has been achieved in energy efficiency, it is believed that far greater improvements are
critical to the country's economic and environmental future.
Energy Policy
The ideas for developing more and more efficient and environment-friendly energy
sources have only recently begun taking root in China's energy policy planning. In the
Ninth Five-Year Plan (1996-2000), for example, the primary role of China's energy sector
has been highlighted as the driving engine for the country's overall economic growth and
modernization. This is to be accomplished by implementing the following five objectives:
(i) alleviating the energy industry's bottlenecks; (ii) building power plants (primarily coalfired); (iii) strengthening oil and gas exploration and development; (iv) improving energy
efficiency; and (v) developing rural energy (including small hydropower, solar, geothermal,
and biogas).
The recent years have seen China stressing strongly on achieving optimum
efficiency by implementing balanced development as well as conservation of existing
resources. Energy consciousness amongst China's policy-makers has been rising. The
Energy Conservation Law of the People's Republic of China was passed on November 1,
1997 and it covers all forms of energy sources and provides an important mandate for
energy-efficiency activities. A critical part of China's energy policy at present is to "put
equal emphasis on both energy development and conservation, and higher priority on
energy conservation in the short term". The need to improve the efficiency of energy use in
all sectors, in parallel with the development of additional energy supplies, is a cornerstone
of China's energy policy for the 21st century.
Energy Efficiency Laws
The energy legal system in China is quite complicated, with many different types
and formats, including national energy laws, provincial codes and departmental
regulations.
They cover the exploration, development, production, supply and
conservation of different energy resources including coal, oil, natural gas, electricity,
nuclear power, rural energy and renewable energy. Many of the energy laws and
regulations in China are administrative rules and regulatory documents issued by the State
Council, and some of them are commands, directions and regulations issued by the
departments and committees under the State Council. In general, the development of
energy efficiency laws for buildings in China over the past two decades can be divided into
four main stages as shown in Table 3.
Table 3. Four development stages of energy efficiency standards for buildings in
China
Years
Major activities
1982-88 Studies on technical standards and codes; development of the trial version of the
residential energy code in 1986.
1988-94 Implementation of the technical standards; demonstration projects; development of
the energy codes for tourist hotels in 1993.
1994-96 Strengthening of the organizations and improvement of policy documents and
codes; setting up of a coordination group and research center by the Ministry of
Construction; updating of the residential energy code; publishing of policy
documents including:
• Ninth Five-year Plan and 2010 Strategy for Building Energy Efficiency in
China
• Technical Policy of Building Energy Efficiency (1996)
1996
Holding of the National Conference on Building Energy Efficiency (9/96); moving
onwards towards market-based energy conservation
• Energy Conservation Law of the People's Republic of China was passed on
November 1, 1997; Article 37 on building design and construction
Building Energy and Related Codes
At present, there are two sets of building energy codes in mainland China, one for
residential buildings and one for tourist hotels. Table 4 shows the contents of these two
codes. The residential energy code (JGJ 26-95) emphasizes thermal insulation to reduce
heating energy, and its trial version (first released in 1986) has been implemented in a few
cities in China, including Beijing and Tianjin. Since the residential sector in China is the
key consumer for energy and many buildings are still using poor envelope thermal
insulation and low-efficiency heating method, much of the attention for energy efficiency is
put on residential buildings. The present target is to achieve 50% energy savings by 2010
(20% from thermal insulation and 30% from building systems and management).
Table 4. Contents of the two building energy codes in China
Energy conservation design standard for new Energy conservation design standard on
heating residential buildings. JGJ 26-95
building envelope and air conditioning for
tourist hotels. GB 50189-93
1. General information
1. General information
2. Technical terms and symbols
2. Technical terms
3. Building thermal targets and heating
3. Basic requirements
coal consumption targets
4. Building envelope
4. Building thermal design
5. Air-conditioning
5. Heating design
6. Monitoring and measurement
Date implemented: July 1996
Note: An
English
translation
http://arch.hku.hk/research/BEER/.
Date implemented: October 1993
of
the
codes
is
available
at
The energy code for tourist hotels (GB 50189-93) is a mandatory national standard
and was developed primarily for tackling the rapid growth of hotel buildings in many cities
of China. The energy consumption in tourist hotels, especially for electricity, is high
because of the need for comfort air-conditioning and other hotel services. The code
specifies prescriptive requirements for the design of building envelope and air conditioning
systems, according to different classes and external climates of the tourist hotels.
There are also some other building design codes which might affect energy
efficiency. A list of them is given in Table 5 and they include codes for thermal design and
other building services systems.
Table 5. Related building codes in China
Related building codes
Date implemented
Thermal design code for civil building. GB 50176-93
October 1993
Lighting design code for civil building. GBJ 133-90
March 1991
Heating, ventilating and air conditioning design code. GBJ 19-87
August 1988
Code for electrical design of civil buildings. JGJ/T 16-92
August 1993
Future Prospects
The energy consumed in buildings in China now accounts for 25-30% of the
country's commercial energy use. But, the current levels of energy services and electricity
consumption per capita or per building are very low compared to international levels. The
present efficiency level of building energy use in China is also low because of technological
constraints, lack of effective management, and poor efficiency of the building materials and
equipment. Historically, China has relied on central control for limiting energy
consumption. With the on-going conversion of China's economic system to a market
economy, the centrally planned system for promoting energy conservation must be
transformed to operate more effectively in the new environment and to maximize the
influence of market forces. This has presented challenges to the design and implementation
of energy codes and legislation. The future role of the energy standards depends on the
resolution of much larger political and economic questions facing China. Fundamental
social forces and policies quite unconnected with energy use affect housing, industrial
structure, urban design and transport infrastructure. These forces have profound impacts
on energy consumption and should be studied carefully.
With the growing of economic development and people's living standards, heated
building areas are expanding and air-conditioned buildings are proliferating very fast. The
increasing demands for energy services will create substantial pressure on energy supply
and economic development. The building energy consumption in China is expected to rise
drastically and the potential for energy saving is large. This will offer a good opportunity
for transforming the economy and promoting future development, but the establishment of
building energy efficiency standards must be accelerated and enhanced. For example, a
building energy code for commercial and office buildings is now being investigated by the
Chinese Academy of Building Research; Shanghai, a key financial center in China, is
studying the feasibility of a high-rise building energy code; the independent municipality of
Chongqing is developing a new energy code which includes both heating and cooling
requirements.
Discussion and Conclusion
Implementation will continue to be the most difficult and sensitive part for building
energy codes in Hong Kong and mainland China (Hui 1999). For building energy codes to
be effective, they must be accompanied by compliance and good building practices. The
expected results cannot be obtained without a sound compliance system; there are several
ways to ensure compliance. Mandatory inspection by local authorities, building energy
certification and labelling, and voluntary compliance are the most common. Effective
implementation and enforcement of the standards requires careful consideration of
technical, marketing, institutional and political factors. Without appropriate educational
programmes and implementation mechanisms for the building industry, even a welldesigned, mandatory standard will not save energy.
Design of standards requires considerable technical knowledge. They need to be
flexible to adapt to dynamic conditions such as technological advances. They also should
increase incentives for industry to invest in development of more energy-efficient
technology. Building energy codes require minimum energy efficiency levels for new
buildings by prescribing either particular materials and/or techniques or levels of
performance. Prescriptive approaches tend to limit development of new technologies and
techniques; minimum prescriptive standards will often become the maximum as there is
little incentive to go beyond code compliance. In contrast, a performance-based approach
could encourage innovation, but would be more complicated and require a higher level of
skills from the designers or users. For better flexibility and optimal efficiency, Hong Kong
and mainland China should move towards performance-based codes and consider local
characteristics in the design of energy standards.
Development of institutional, scientific, planning and management capacities is
critical to the sustainable and effective use of energy standards. Since July 1997, Hong
Kong has became a "Special Administrative Region" of the People's Republic of China. At
present, the relationship between Hong Kong and mainland China is quite interesting; they
have their own sets of building energy codes and regulations and they have also taken
different approaches to energy-efficiency issues. As Hong Kong is an important window
and a major city of China, there are opportunities for enhancing technology transfer and
demonstration for energy-efficiency improvements through international cooperation. The
result of these efforts will have long-term implications for the social and economic
development of the Asian region and the world.
As the published information about energy standards in developing countries is
limited (Janda and Busch 1994), it is hoped that the analysis presented here could provide
information to partly fill the information gap. The experience in designing the building
energy codes and promoting energy-efficiency activities might also be useful for other
locations in the world with similar climate and societal structure.
References
Building Authority. 1995. Code of Practice for Overall Thermal Transfer Value in
Buildings 1995. Hong Kong: Building Authority, April.
CSD. 1999. Hong Kong Energy Statistics Annual Report 1998 Edition. Hong Kong:
Census and Statistics Department (CSD), Hong Kong.
EMSD. 1998a. Code of Practice for Energy Efficiency of Lighting Installations. 1998
edition. Hong Kong: Electrical and Mechanical Services Department (EMSD), the
Government of the Hong Kong Special Administrative Region.
EMSD. 1998b. Code of Practice for Energy Efficiency of Air Conditioning Installations.
1998 edition. Hong Kong: Electrical and Mechanical Services Department (EMSD),
the Government of the Hong Kong Special Administrative Region.
EMSD. 1998c. Guidelines on Energy Efficiency of Lighting Installations. 1998 edition.
Hong Kong: Electrical and Mechanical Services Department (EMSD), the
Government of the Hong Kong Special Administrative Region.
EMSD. 1998d. Guidelines on Energy Efficiency of Air Conditioning Installations. 1998
edition. Hong Kong: Electrical and Mechanical Services Department (EMSD), the
Government of the Hong Kong Special Administrative Region.
EMSD. 1999a. Code of Practice for Energy Efficiency of Electrical Installations. 1998
edition. Hong Kong: Electrical and Mechanical Services Department (EMSD), the
Government of the Hong Kong Special Administrative Region.
EMSD. 1999b. Code of Practice for Energy Efficiency of Lift and Escalator Installations.
Draft edition. Hong Kong: Electrical and Mechanical Services Department (EMSD),
the Government of the Hong Kong Special Administrative Region.
EMSD. 1999c. Hong Kong Energy End-use Data (1985-1995). Hong Kong: Electrical
and Mechanical Services Department (EMSD), the Government of the Hong Kong
Special
Administration
Region.
(http://www.info.gov.hk/emsd/english/energy/database/bds-e.html)
HKIA. 1992. HKIA's Position Paper on Overall Thermal Transfer Value (OTTV) Control
in Buildings. Hong Kong: Hong Kong Institute of Architects (HKIA). June.
Hong Kong Government. 1995. Building (Energy Efficiency) Regulation. Cap. 123 sub.
Leg. M (L.N. 144 of 1995). Hong Kong: Government Printer.
Hui, S.C.M. 1997a. "Study of Building Energy Efficiency and Engineering & Construction
Standards". In Proc. of the Mainland-Hong Kong Engineering & Construction
Standards Exchange Seminar (Hong Kong Section), 14-15 April 1997, Beijing,
China, 22.1-22.10. (In Chinese)
Hui, S.C.M. 1997b. "Overall Thermal Transfer Value (OTTV): How to Improve Its
Control in Hong Kong". In Proc. of the One-day Symposium on Building, Energy and
Environment, 16 October 1997, Shangri-la Hotel, Kowloon, Hong Kong, 12-1 to 1211.
Hui, S.C.M. 1999. "Recent Developments and Analysis in Energy Efficiency in Buildings
in Hong Kong". Energy Efficiency in Buildings 1999 (1): 6-10. (In Chinese)
Janda, K.B. and J.F. Busch. 1994. "Worldwide Status of Energy Standards for Buildings".
Energy 19 (1): 27-44.
Lam, J.C. and S.C.M. Hui. 1996. "A Review of Building Energy Standards and
Implications for Hong Kong". Building Research and Information 24 (3): 131-140.
Lam, R.S.F. 1998. An Analysis of the Policy of Energy Efficiency and Conservation in
Hong Kong in the 1990s. Master of Public Administration (M.P.A.) thesis, University
of Hong Kong.
Nadel, S. 1997. "The Future of standards". Energy and Buildings 26 (1): 119-128.
Sinton, J.E., M.D. Levine and Q.Y. Wang. 1998. "Energy Efficiency in China:
Accomplishments and Challenges". Energy Policy 26 (11): 813-829.