homes in the park – a sustainable public housing estate

Stephen Yim

Hong Kong Housing Authority12 September 2013

Homes in the ParkHomes in the Park

A Sustainable Public Housing Estate A Sustainable Public Housing Estate

Conserved from an Old Airport Conserved from an Old Airport

at Kai at Kai TakTak in Hong Kongin Hong Kong

Sustainable Building Conference 2013

Contents

1. Introduction

2. Project Description

3. Green Initiatives

a) Passive Building Design

b) Green & Healthy Living Environment

c) Energy Conservation

d) Green construction techniques

e) Carbon Emission Estimation

4. Conclusion

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 programmeuntil 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

People-centric approach

Hong Kong Housing Authority’s Vision, Mission & Core Values

• 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

To meet present social, economical and environmental needs but NOT at the expense of future generations.

Balance the development potential

Integrate green landscape planningVitalize local economy

Economic

经济经济经济经济 Environmental

环境环境环境环境

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

社会社会社会社会

Optimize use of social welfare and communal facilities

Effective use of resources

Enhance social interaction

Strengthen community Identity

Building a Sustainable Community

Project Description

“Homes in the Park”

Kai Tak Airport in the old days

Serving as an icon for 77 years

The Kai Tak Development

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Kai Tak development is a huge and highly complex project spanning 320 hectares. It offers quality living environment for around 86,000 residents, revitalizes surrounding districts and cultivates a comprehensive network of parks and gardens.

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77

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Kai ChingKai Kai ChingChing

TakTak Long Long

Kai Ching and Tak Long Estate

Theme – “Homes in the Park”

The two estates, namely Kai Ching Estate and Tak Long Estate, are public rental

housing estates with total site area of 9.1 hectares providing about 13,300 flatsfor 34, 000 residents in 15 domestic blocks. Domestic Plot Ratio is up to 6.3. Population intake will be completed in February 2014.

a) Passive Building Design


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Micro-climate studies to optimize the planning and design of buildings and outdoor

spaces to provide a healthy and quality living environment for tenants. Domestic

blocks to capture the prevailing south-easterly wind for most of the year to enhance

air ventilation.

NORTH

Animation

(a) Passive Building Design


Ground Floor Ventilation Bays to enhance Wind Environment at Pedestrian Level

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Retail facilities are provided in the form of street front

shops in pedestrian precincts. Arcades on the first

floor level are naturally ventilated.


b) Green and Healthy Environment


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(b) Green and Healthy Environment

Central park is fully integrated with

smaller pockets of open area with

seating, planters and trellises at the

edge of the blocks together with

covered foyers to provide

communal places for residents.

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Greening ratio over 30% of the respective site area, including at least 20% at the

pedestrian zone. The rest comprises roof greening and vertical greening.


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Signal Hill 信號山信號山信號山信號山

Aircraft Icon

飛機標誌飛機標誌飛機標誌飛機標誌

Aviation elements such as the Signal Hill and aircraft icon have been adopted as

design features. Exhibition gallery is planned to showcase some recollections and

unique memories of Kai Tak to enhance a sense of belonging amongst the residents.

Exhibition Gallery

展覽廊展覽廊展覽廊展覽廊



Community Engagement Workshop for Fotomoat Kai ChingEstate

Primary School Pupils

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Rainwater Harvesting System helps reduce fresh water consumption by providing filtered rainwater for irrigation while Root Zone Irrigation System supplies water directly to plant roots. Evaporation of water can thus be minimized and the amount of irrigation can be reduced.


Intelligent Solar-Powered Wireless Automatic Irrigation System


This is the first housing project in Hong Kong to adopt Intelligent

Solar-Powered Wireless

Automatic Irrigation System.

The WWS wireless multiple weather station sensors provide

information to the controller which

completely stops irrigation when it

is raining. The power supply for

the weather stations is from the

PV panels installed on domestic

tower roofs.

This system reduces the average

irrigation amount down to 3.5

litres/m2.

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Root Zone Irrigation System – water saving up to 50%

• Polyethylene drip pipes wrapped in specially designed fleece

• Drip pipes to fill the mat with water

• Irrigation mat enables even distribution of water

• Water migrates by capillary effect to the drier part of soil

• Mat is usually installed about 10 to 20 cm below soil surface

• Suitable for lawn areas, flower beds and small shrubs

Drip hole

Layer 1: Special fleece

Dripline

Seam: PP threadDrip pipe:

Wrapped in

Special fleece

Layer 2: fleece


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Root Zone Irrigation System

Trial at construction site from May 2011 to March 2012

Trial Results

• Water saving potential is approximately 38%

- Plot provided with root zone irrigation system –

1.54 litre/m²/day

- Plot provided with manual irrigation –

2.5 litre/m²/day

• Maintenance free but excavation and backfilling required

in case of repair as irrigation mat and drip pipes are installed

under soil

• Suitable for small vegetation since the mat cannot be

installed more than 400mm below soil surface


c) Energy Conservation


(c) Energy Conservation

District Cooling System provides chilled water to the air conditioning systems of the retail facilities, kindergarten & estate management office.

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Kai Tak Site 1A啟德第一甲區啟德第一甲區啟德第一甲區啟德第一甲區

Kai Tak Site 1B啟德第一乙區啟德第一乙區啟德第一乙區啟德第一乙區

Source: Kai Tak Newsletter Issue 5 by

Civil Engineering and Development Department

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Electric Vehicle Charging Facilities (Domestic)

• Design the chargng facilities for easy operation


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Photovoltaic panels

located at roofs of building blocks

BIPV located at canopy of commercial centre

PV Panels & BIPV


Annual electricity generation is around 2.5% of the annual energy consumption in communal areas.

Regenerative power for lifts & Use of permanent magnet

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Regenerative power for lifts

• Lift can work as a generator to

produce electrical energy if it

operates under heavy load down or

light load up.

• Technology enables capturing the

regenerative power from lift system

for feeding into the grid for immediate

consumption by the communal

installations.

• Maximum power regenerated can be

up to 20% of power consumed.

Gearless Permanent Magnet Synchronous (PMS) Lift Motor

• PMS lift motor is a technology that can be used to drive lift

machine with probable energy saving.

• Trial installation is being implemented in Kai Tak Site.

Theme 4 :We design hygienic plumbing and drainage systems; we conserve water and energy


Additional capital cost: HK$30,000 / lift

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Light Emitting Diode (LED)

Downlight at G/F entrance lobbies

Two-level Lighting Control at lobby and corridor(at least 40% energy saving of lighting power)

Motion sensor, 2-level lighting systems & LED light fitting (Domestic)

Motion Sensor at staircases

LED bulkhead at lobby and corridor of one domestic block


(at least 20% energy saving of lighting power)

d) Green Construction Techniques


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Semi-precast Slab

Backfilling and Compaction with Cement-

Stabilization Marine Mud

Marine Mud Factory On-site Marine Mud Made Pavers

Marine mud paving blocks (Domestic)

(d) Green Construction Techniques

By treating the marine mud with appropriate proportion of cement and sand, we can re-use it for in-situ backfilling thereby alleviating the pressure on landfill sites.

Grand Award of Green Building Award 2012

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Marine Mud Factory On-site

Conventional Concrete Mix

Trial Use of Innovative Concrete Mix Design and Quality Management System

The system optimizes particle packing thereby reducing cement content and in turn reducing carbon dioxide emissions from the concrete production process.

A saving of 5% of the total concrete cost of the low rise structure

Innovative Concrete Mix


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Modular Design and Component Prefabrication Techniquesreduce wastage and falseworks

Precast Façade

Precast Staircase

Fabric Reinforcement

Semi-precast SlabVolumetric Precast Bathroom


Approximately 35% of precast elements (volume of concrete) achieved.

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Electric Vehicle as Contract Cars to support and promote the use of electric vehicles


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Trial Use of Bio-Diesel Fuel

Bio-diesel fuel has been adopted for trial use for some of the construction equipment, including mini-loader, excavator and precast elements delivery trucketc. to reduce the emission of green house gases.

Total reduction in carbon emission is 5 tonnes.


e) Carbon Emission Estimation


Life cycle cost & Life cycle assessment

(e) Carbon Emission Estimation

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Service Life of HA Buildings completed after 1992

VisualVisual

InspectionInspection

NonNon--DestructiveDestructive

EvaluationEvaluation

DestructiveDestructive

TestingTesting

0

10

20

30

40

50

60

70

slab half-landing internal wall external wall

Building A

Building B

Building C

Building D

Building E

Building F

Building G

Building H

FindingsWith appropriate maintenance and monitoring regime, service life of housing building structures completed after 1992 is at least 100 years or more I Thus we can do less demolition works in the years to come I

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Harmony One BlockMethodology

Test Results


I + II + III – IV – V + VI = Total COTotal CO22 EmissionEmission

Total CO2

Emission

II : Materials for Structure

IV : Renewable Energy

VI : Demolition

I : Material Consumed

During Construction

III : Communal

BS Installations

V : Tree

Carbon Emission Estimation

碳排放估算

• Enables the evaluation of total CO2 emission of buildings from cradle to

grave at the design stage

• Provide a control parameter for our building design as well as an

indicator to reflect the overall environmental burden of our buildings


Kai Ching Estate Adopted as Benchmarking Estate

Carbon Emission Estimation: - 327,623 tones per estate

Aspect II :

Building Structure

Aspect I :

Materials Consumed During Construction

Concrete & SteelConcrete & SteelTimber FormworkTimber Formwork

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Category

類別Carbon Effect

碳效應Aspects

範疇

I Carbon Emission

碳排放量I Materials Consumed During Construction

施工中的材料使用

II Building Structure

結構材料

III Communal Building Services Systems

公共建築設備安裝

IV Demolition

拆除

II Carbon Reduction

碳減少量V Renewable Energy

可再生能源設施

III Carbon Absorption

碳吸收量VI Planting

綠化

- 62.96 tones per flat


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Smart Meters and Display Panels at ground floor lobbies to show the average electricity,

water and gas consumptions per flat of individual blocks.

Smart Meters (Domestic)

Initiatives for Reduction of Carbon Emission

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Conclusion

• We care, we serve and we excel.

• We understand we cannot work alone but we need to work in collaboration with academic institutions, market experts, and industry stakeholders to drive the innovations for sustainability.

• We will continue to work in partnership with the industry to foster sustained quality improvements through innovation and collaboration.

Kai Ching Estate

HK BEAM 4/04 Version – “Platinum”

China Green Building Evaluation Label – “3 Star”

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Thank YouThank You

homes in the park – a sustainable public housing estate

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