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Eco-design and Construction

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Energy Efficiency

Implementation of an Energy Management System (EnMS) in accordance with the ISO 50001 Standard

Since December 2011, we have established and implemented an EnMS in accordance with the ISO 50001 standard on our residential building design. Through the implementation of the EnMS, a baseline and an Energy Performance Indicator (EnPI) for energy consumption of building services installed in the communal areas of the public housing blocks were initially set at 30kWh/m2 annually, and applied to all our new projects for comparison, and for design adjustment to achieve the target performance if necessary. This EnPI was tightened from 27kWh/m2 to 24kWh/m2 in 2016 to further enhance the energy performance of our designs.

The ISO 50001 EnMS was built on a Plan-Do-Check-Act management model which focused on energy efficiency, use and consumption in communal building services installations of domestic public housing blocks. In June 2012, we obtained the ISO 50001 certification on residential building design.

ISO 50001 certificate

ISO 50001 Certificate

For the existing estates, in mid-2013 (on 27 June 2013), Kwai Shing West Estate was the first residential estate and the first public rental housing (PRH) estate in Hong Kong granted with ISO 50001 certification. With the successful experiences gained at Kwai Shing West Estate, we have committed to extend the certification to cover all existing PRH domestic blocks by April 2015 in two phases.

The Phase One certification for 621 domestic blocks in 92 PRH estates was obtained in August 2014 and the Phase Two extended certification to coverall 1 156 domestic blocks in 167 PRH estates has been obtained in April 2015. Re-certification of all existing PRH estates was obtained in May 2016 and valid until June 2019.

Optimisation on Illumination Level of Domestic Blocks

In response to the requirements laid down in the Design Manual: Barrier Free Access 2008 promulgated by the Building Department, the illumination standard of public areas has been significantly increased to cater for the needs of persons with special needs such as those having impaired vision. To achieve the new illumination standard for domestic blocks without undue increase on energy consumption, a two level lighting control system has been adopted in new design for domestic blocks since December 2008. This system enables users raising the lighting level when needed. The illumination levels for public areas are as follows:

Normal Mode

Triggered Mode

- for typical lobby

50 lux

85 lux

- for typical corridor

30 lux

85 lux

- for staircase

30 lux

85 lux

- for ground floor lift lobby

120 lux

NA

- for lift car

150 lux

NA

Raise the lighting level of public areas

Adopting EMSD's Code of Practice for Energy Efficiency

The lighting, electrical, air-conditioning and lift & escalator of new buildings have been adopting the design in accordance with the requirements of building energy codes issued by EMSD. During 2016/17, 36 energy certificates have been obtained under the Hong Kong Energy Efficiency Registration Scheme for Buildings from EMSD.

'Hong Kong Energy Efficiency Registration Scheme' Energy Certificates

"Hong Kong Energy Efficiency Registration Scheme" Energy Certificates

Photocell Sensor Control for Lights in Public Areas of Domestic Blocks

Photocell sensor controls for lights are installed in areas with natural light, such as areas near the windows in communal areas, to switch off some lights to save energy when the illumination level is adequate.

Photocell sensor controls for lights

Photocell sensor controls for lights

The Use of Electronic Ballast to replace Electromagnetic Ballast

For fluorescent type lighting fittings, about 20% of electrical energy could be saved if electronic ballast is used instead of electromagnetic ballast. In view of this, since 2003, we have widely adopted the use of electronic ballast. At present, all fluorescent type lighting fittings are equipped with electronic ballasts.

Starting from 2012/13, we have launched a 42-month programme of replacing existing light fittings equipped with electromagnetic ballast by energy-saving electronic ballast in communal areas of all our existing estates, covering around 960 domestic blocks. The replacement work for all 960 domestic blocks have been completed in September 2015.

Wider Use of T5 Fluorescent Tube and LED Lighting Systems

Since 2003, T5 fluorescent tubes of higher efficacy have been used for all exit and directional signs to replace their T8 counterparts. Coupled with the use of electronic ballast, the overall efficacy of the fixture can be raised by about 20 - 30%. Since early 2016, we have adopted LED bulkheads as standard luminaires for communal areas of domestic blocks in all new works projects under planning or design.

LED installations

LED bulkheads

Variable Speed Drive Control for the Fresh Water Booster Pumping System

We have adopted variable speed drive control for the fresh water booster pumping system in all new projects. The system has been used together with smaller stainless steel pneumatic pressure vessels and stamped stainless steel multi-stage pumps to achieve higher energy efficiency and occupy lesser plant room space.

Hybrid Ventilation / Free Cooling System

Hybrid Ventilation / Free Cooling System has been introduced at some new shopping centres. Combining the use of natural ventilation, air-conditioning and mechanical ventilation system as well as switching between operation modes to suit users' needs, the new system can reduce energy consumption and carbon emissions from the air-conditioning and mechanical ventilation system. The system could be adopted in appropriate projects in accordance with relevant guidelines.

District Cooling System

In the new PRH development at Kai Ching Estate and Tak Long Estate, we have adopted the centralised and energy-efficient chilled water supply system, the District Cooling System (DCS), implemented by the Electrical and Mechanical Services Department to provide chilled water through underground chilled water pipe network to the air-conditioning systems of the non-domestic facilities including shops, kindergarten and estate management offices. Compared with the conventional air-cooled chiller system, the DCS is able to save energy up to 35%.

Trial Use of Energy-saving Technologies and Initiatives for Lift Installations

We have adopted a number of energy-saving technologies and initiatives for lift installations. These include the use of permanent magnet synchronous motor machines in lift installations, the provision of regenerative power for lift motors of 8 kW or above and the use of gearless type lift drives to reduce energy consumption. In addition, to save space, more compact and less heavy lifts without machine rooms have been provided for lift towers and low-rise buildings.

Smart Meter Monitoring and Energy Information Display System

We have adopted Smart Meter Monitoring and Energy Information Display System in the ground floor lobbies of the domestic blocks in new estates. The system displays electricity, gas and water consumption data on a regular basis. The system facilitates comparison of energy consumption among blocks of the same estate with a view to raising the awareness of tenants to save energy.

Smart Meter

Display of the smart meter monitoring system at ground floor lobby of Tak Long Estate