Teaching Kit DAT
Bringing Green and Healthy Living to Harmonious Communities
The Hong Kong Housing Authority's Experience
Ada Y. S. Fung, JP FHKIA, RIBA, ACIArb, FCIOB, MHIREA, Hon FHKIPM, Hon FHKIBIM, Hon FCICES, Registered Architect, APEC Architect, ASC, BEAM Pro, HKIAC Accredited Mediator
Deputy Director of Housing (Development & Construction) Hong Kong Housing Authority
Contents
1. Introduction
2. Caring for People
3. Caring for the Environment 4. Conclusion
1. Introduction
Overall Land Area : 1,108 km2 Residential Area :
Private Housing 25 km2
Public Rental Housing 12 km2 Subsidized Sale Housing 4 km2
Rural Settlement 35 km2
4
Land Use in Hong Kong
• Hong Kong is widely known for her high densityand efficient use of land, which is a scarce resource and thus must be optimized in its use.
• Depending on districts, the planning brief for land earmarked for public housing development typically dictates aplot ratio of around 5 to 6.
• When planned according to statistically predicted flat mix to meet housing demand, thisdensity will roughly translate into about1000 flats per hectare, or 2800 persons per hectare.
• We need to buildhigh rise domestic blocks of 30 to 40 storeysin order to accommodate this density.
• About 30% of Hong Kong’s 7 million people
are residing in public rental housing.• We have an existing stock of about 730,000 public rental flats
• Allocation standard is 7m2 per person. Average living
space is about 12.8 m2 per person.
Density in Hong Kong (2)
Permitted Plot Ratio
• Hong Kong Island : 8 to 10
• Kowloon : 6 to 7.5
• New Territories : Not more than 5
Upper Ngau Tau Kok Estate
Plot Ratio : 7
6
Shui Chuen O PRH Development
Plot Ratio : 5
Hung Shui Kiu
PRH Development
Plot Ratio : 4
8
Compact City –
High-Rise, High Density Urban Living Environment
Calls for innovation in creating a comfortable living environment …..
….. In particular for low income families.
The Hong Kong Housing Authority
• The Hong Kong Housing Authority (HA) was established in 1973 under the Housing Ordinance
• The Housing Department (HD) is HA’s executive arm
• The HA develops and implements a public housing programme to provide subsidized housing for people who cannot afford private
housing
• The HA plans, builds, manages and maintains different types of public housing
• The HA has an existing stock of about 730,000 public housing flats and builds an average of about 15,000 flats a year with a rolling 5-year
programme until 2016/17, and we shall build 100,000 flats in the five year period from 2018 onwards.
• In the coming years, the HA will build 17,000 subsidized sale flats from 2016/17 to 2019/20, and thereafter build 5,000 flats each year under the Home Ownership Scheme
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• To help low-income families with housing need to gain access to affordable housing
• To provide affordable quality housing, management, maintenance and other housing related services in a proactive and caring manner
• Cost-effective and rational use of public resources
• Competent, dedicated and performance-oriented
team
People-centric approach
HA’s Vision, Mission & Core Values
To meet present social, economic and environmental needs but NOT at the expense of future generations.
Balance the development potential
Integrate green landscape planning Vitalize local economy
Economical Environmental
Encourage outdoor family activities
Enhance environmental awareness
Enhance health &
exercise awareness for all ages
Promote renewable energy Minimize construction waste
Enhance accessibility &
linkage
Enhance environmental comfort by considering microclimate in planning Minimize environmental impact to the
neighborhood
Social
Optimize use of social welfare and communal facilities
Effective use of resources
Enhance social interaction Strengthen community Identity
Building a Sustainable Community
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2. Caring for People
On My Way Home …..…….
….. close to public transport terminus and pick-up areas and shops …..
linked up with covered walkways and lift towers …..
….. Tactile Guide Path System with
Multi-sensory Map installed at strategic locations of housing estates to lead
people to domestic blocks and major estate facilities …..
Living Experience
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Play areas, leisure and greening
• Community play area for all ages and abilities
• Provide planting at grade and slope areas as far as possible.
• Plant at least one tree for every 15 flats.
• Greening Ratio: at least 20% (30%
for large sites)
Before Greening
After greening
• Grow plants on roof tops
• Install vertical green panels on the external walls of public facilities.
• Introduce community planting to enhance neighbourliness.
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Green Roof , Vertical Greening and Community Farm
to reduce urban heat island effect
Comfortable Environment …..…….
….. a comfortable and functional external environment - an essential facility in
housing estate…..
….. seats provided in rest areas …..
Social Cohesion
….. seats provided inside and outside G/F lobby and other communal areas ..….
….. free WiFi provided at G/F lobby ….
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….. domestic block
entrance protected
from the weather with
security door phone
system …..
….. 24-hour security patrol, passenger lifts with Closed Circuit TV , mail boxes with
secure front panels and mail delivered from the rear via a locked mail delivery room …..
In safe hands …..…….
….. Barrier Free Access provided to all lobbies, corridors and lifts …..
uninterrupted lift service …..
and 2-level Lighting System in corridors….
……. floor directional plan and colour
identification to individual corridor for
user-friendliness ….
…… self contained flat with basic provisions include flat entrance gateset, window grilles, kitchen sink, cooking bench, wash basin, sunken shower, laundry rack to meet essential needs …..
Home Sweet Home …..…….
….. no bedroom partitions, no floor finish to allow flexibility and choice of furniture layout and partitioning by tenants …….
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We mitigate noise to create comfortable living environment for residents.
At Receiver End At Source At Propagation Path
Low noise road surfacing
Noise Enclosure
Noise Barrier
Non noise sensitive building
Building setback
Acoustic Windows Acoustic Balcony
Flat configuration & Disposition
•Construction of Development at Ex-Cheung Sha Wan Police Quarters
•Block 2
•Block 1
Micro climate study and passive design
• Energy Saving
• Low Carbon Emission
• Reduce Electricity Bill
We make best use of natural lighting and ventilation to create comfortable external environment.
Disposition, design and orientation of buildings
• Harness the natural
characteristics of the site, such as local wind
direction for natural
ventilation, solar path for natural lighting
• Create wind corridor
• Reduce solar heat gain
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We make best use of natural lighting and ventilation to create comfortable internal environment.
Domestic Flat -
• Additional and enlarged windows for better natural
lighting and cross-ventilation in living areas, bathroom and
kitchen.
Corridors and Lobbies -
• Enhance natural lighting
and cross ventilation
• Incorporate Common W- Trap System in drainage system to prevent dry up floor drain trap.
• Twin Tank System for uninterrupted supply of
fresh / flush water. • Mail box type collection system for sorted recycling materials
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We innovate to create healthier, more hygienic, and
convenient living environment
We endeavour to reduce nuisance in the neighbourhood for harmonious living.
• Minimize overlooking problem in modular flat design.
• Keep the flat entrance away from lift lobby.
• Locate the refuse storage and material recovery room and refuse chute away from domestic flats
To domestic flats
Away from domestic flats
• Determination of prevailing wind by Wind Tunnel Test
• Ventilation conditions of mid, high and low zones of domestic blocks are studied
• Enhancement to immediate neighbourhood
Wind Tunnel Test
Before Redevelopment
After Redevelopment
Wind Environment CFD simulations
Microclimate Studies
Site Aspects
Wind Corridor Design
Verification of simulation results with measurement data Correlation of Measurement Data and Simulation
Results of Daylight Performance
0 5 10 15 20 25 30
0 5 10 15 20 25 30
Measured (VDF, %) Simulation (VDF, %) Simulation = Measurement
N
Velocity (m/s) 1.1 m/s
1.1 m/s
1.8 m/s 1.1 m/s
Microclimate Studies
– simulations and on-site measurementVentilation Bay
Wind Permeability at Pedestrian Level
• No podium
• Ventilation bays at pedestrian levels:
up to 1.8m/s (summer) per on site measurement
• Residents’ response:
91% very satisfactory
Site Aspects
Proposed Development with cross- ventilated corridor
Proposed Development withoutcross- ventilated corridor
Better Ventilation
18%
70%
88%
155%
35%
174%
1250
%
250%
59%
97%
24%
76%
98% 0.44m/s
0.27m/s
0.33m/
s
0.26
0.19 0.38
29%
55%
0.93%
1.40m/s
0.08
0.36
0.46
Building Permeability
To enhance building permeability towards prevailing wind, we apply cross ventilated corridor design by providing openings on each floor. With more permeable building, wind passes through even high-rise buildings.
Upper Ngau Tau Kok Estate Phase 2 & 3
Tensile cover as wind deflector to enhance wind environment of Entrance Plaza
帳棚也作遮陽用途
Children Play Area 3 1.2m/s < 5.5m/s Children Play Area 2
& Mini-Botanical Garden 1.5m/s < 5.5m/s
Bird Watch Terrace 0.4m/s < 2m/s
Recreational Basketball Court
0.5m/s < 5.5m/s
Community Farm and Nursery 0.4m/s < 2m/s
Summer E-wind
Ravine Garden 1.5m/s < 5.5m/s Children Play Area 1 1.5m/s < 5.5m/s Foot Massage Walk 0.4m/s <5.5m/s
Entrance Plaza 1.0/s < 5.5m/s
N
Resident survey result:
up to 99% very satisfactory on wind environment in external public areas
Thermal Comfort at External Environment Site Aspects
Ventilated corridors with natural daylight achieve energy saving up to 15%
Daylight Enhancement
Daylight Energy Saving at Corridors
0 5 10 15 20 25 30 35
Block 1 Block 2 Block 3 Block 4 Block 5 Block 6
% Saving by Daylighting
Low Level Mid Level High Level
Me an saving of 13% of total Lighting Cost for Corridors or Cost Saving of $42,500/Month
Maximize view and daylight penetration for domestic flats and common areas
Mean saving of 13% of total Lighting Cost for Corridors or Cost Saving of $42,500/ Month Average Vertical Daylight Factor for Living Room - Block 4
Daylight Energy Saving at Corridors
Energy Aspects
Schematic
Design Detailed Design
Occupation
「
「
「
「物以情聚」
Heritage Exhibition
Partnering with Residents
– Community EngagementContributes to quality improvement
Shuttle Lift stops on Levels 1 and 2 to meet the need of the elderly and the disabled.
Tenants’ Participation in Design
Handrails, guided paths and seats were added along the main covered walkways.
Tenants’ Participation in Design
Exercise Areas for the
Elderly
Heritage Gallery – design was based on local café
in Lower NTK Estate
Leisure Sitting-out
Area
「
「
「
「物以情聚 物以情聚 物以情聚 物以情聚」 」 」 」 懷舊展覽會 懷舊展覽會 懷舊展覽會 懷舊展覽會
Heritage
Exhibition in 2002
Artifacts donated by tenants are transformed into displays in 2009.
Heritage Conservation
Corporate governance and social responsibility delivery
Upper Ngau Tau Kok Estate
In designing our projects, we carry out Community Engagement to collect stakeholders’ views and
aspirations, and incorporate them.
We also carry out surveys of residents’ views after the occupation of new
estates to gauge our
success and identify areas for improvement.
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Prevent Heat Stroke
First Aid Facilities & Equipment
Sheltered Rest Area Drinking Facility
Free Distribution of Watermelon on every Wednesday in Summer
Health Checking
Pre-work Health Check
Securing and Monitoring Wages Payment to Workers
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We care not only for our tenants, but also for our
construction workers
Business
We change the culture of the Construction Industry
4D
• Clean & tidy
• Safe
• Satisfying
• Sustainable
• Dirty
• Dangerous
• Demanding
• Disruptive
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Our SAFETY achievements are encouraging!
New Works Site Safety Performance
千人意外率
54.6 52.1 49.7 60.6 61.4
59.9 64.3 68.1 60.3
85.2 114.6 150
198 248 220 227
236 275 302 295
353 364 374
41.3
8.1 9.0 9.4 9.9
11.9 16.1 21.0 11.5
29.2 32.8 37.8 55.8 86.0 109 129
77 82 90
88 160 195 206 221
206
0 50 100 150 200 250 300 350 400
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012#
香建造業 房委會工程
# 根據截至2012年上半年資料推算
資料來源: 勞工處, 政府統計處及房委會地
盤報告表 備註 : 由2001年起工地意外數字分類為房委會新工程及
保養工程類別
房委會
香建造業
Construction Industry (HK)
HKHA New Works
Customer Survey Results
Customer Satisfaction Index of the past five years
(from > 74% in 2007/08 to about 90% in 2010/11, 2011/12)
42 0
10 20 30 40 50 60 70 80 90 100
2007/08 2008/09 2009/10 2010/11 2011/12
%
Year
Society Results
High achievement in HKQAA-HSBC CSR Index (ISO 26000) assessment
Since 2006
Since 2000
7 Core Subjects of ISO 26000
2010 2011 2012 HA (DCD) 4.90 4.97
5.00
HK average 4.57 4.62 4.64 Maximum score = 5.00
3. Caring for the Environment
Using Modular Flat Design
• Regulated standards
• Enhanced buildability , consistency &
economies of scale
1 Bedroom Flat
1-2 Person Flat
2 Bedrooms Flat 2-3 Person Flat
Using Prefabricated Elements …..
• Production under factory environment
• Less material wastage
• 30%
less C&D wastes on-site, safer• Staircases
• Facades
• Semi-precast slabs
• Volumetric precast- bathrooms/ Kitchens
• beams
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….. Including Volumetric Precast Elements
Using Large Panel Formwork, etc.
• Metal large panel formwork / Metal hoarding
• Mechanised construction/precasting
• Less material wastage
• Repeated use, recycle
• Timber from sustainable sources for temporary works
Save
15000
tonnes of timber in
2011/12
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Using recycled materials
• Cement–stabilised marine mud recycled for backfilling and making masonry blocks, pavers and roof tiles.
• Paving Blocks with Recycled Glass & Aggregates
• Use bore-logs as planter kerbs.
• Use GGBS to partially replace cement in precast concrete construction.
• Recycled excavated rock materials for construction of ‘footing’ of site hoarding and for constructing Gabion structures
Carbon Emission Estimation (CEE)
• To realize green and low carbon building designs, a straight and pragmatic
methodology is necessary to give a direct indication of the holistic environmental impacts from residential buildings .
• Potential to reduce carbon emission is high if decision is made at building design stage.
• An effective design verification tool to
holistically gauge the net carbon emission of domestic buildings.
• Focusing on the CO2 emission associated with major construction materials and
building operations from cradle to grave for a building life of 100 years.
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I + II + III – IV – V + VI = Total CO2 Emission Total CO2
Emission
I : Materials Consumed During Construction
II : Materials for Structure
III : Communal
BS Installations IV : Renewable Energy
V : Trees Planting VI : Demolition
Methodology for Carbon Emission Estimation
Two “Green” aspects, i.e. Aspect IV and Aspect V are included to take stock of the provisions with “carbon-reduction” and
“carbon-absorption” effect.
Total CO
2Emission
Lighting -
• Optimizing daylight through employment of photo sensors and time switches
• Adoption of energy efficient electronic ballasts and T-5 fluorescent tubes
• Optimization of illumination levels by means of 2-level lighting system for lift lobbies, corridors and staircases on typical floors
Lifts -
• Optimization of lift provision and design
• Light weight lift car decoration design
• Adoption of variable voltage variable frequency (VVVF) lift driving system Water Pumps -
• Electronic variable speed drive control
systems coupled with stamped stainless steel pumps in the fresh water booster pump system
• High efficiency motors
Reduction of Energy Consumption
Certified to ISO 50001 in June 2012, the first organization in Hong Kong for residential building design.
Use of Renewable Energy
New Buildings – How Are We Doing ?
14.4 KWh / m
2GFA / year
The sum of all the above
= Contented Tenants!
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Economic Environmental
Social
Caring Creative
Customer-focused
Committed
Staff Stakeholder
Supervisor
Structure
System We buy
We learn We deliver
We listen We share
We innovate
We have holistic vision and effective operation through Total Quality Management, involving both internal and external parties.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
This is our DNA.
Our “Big Picture”: We walk the talk.
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A Compact City is NOT
a City “Without Ground”
• It is grounded in people’s needs
• It is grounded in people’s way of life
• It is grounded in its natural environmental characteristics
• It is a city with its ground intelligently and optimally freed up and greened to support community building
We serve, we excel through a people-centric approach, applying our Core Values of 4Cs,
plus Total Quality Management to assure -