5 mar 2013 (tue) benefits and potential of vertical...
TRANSCRIPT
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Dr. Sam C. M. HuiDepartment of Mechanical Engineering
The University of Hong KongE-mail: [email protected]
Web: http://web.hku.hk/~cmhui1911-2011
Benefits and potential ofvertical greening systems
Mar 2013
CIBSE Hong Kong Branch AGM5 Mar 2013 (Tue)
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Contents
• Introduction• The Need for Greenery• Vertical Greening Systems• Types and Classification• Possible Benefits• Key Considerations
I like Greening.
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Introduction
• CIBSE-HKB research projects• Green roof systems (completed)• Vertical greening systems (on-going)
• Results and outcomes• Technical reports• CIBSE(UK) publications• Conference/journal papers• Oral presentations
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Introduction
• Research on vertical greening systems• Objectives:
• 1. To study and evaluate the current knowledge and technologies on vertical greening and green/living walls in the world
• 2. To assess the potential benefits and key design factors for vertical greening systems in Hong Kong
• 3. To develop technical guidelines and information for planning and design of vertical greening systems in Hong Kong
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The Need for Greenery
• Hong Kong 香港• Land area: 1,104 km2
• Population: 7.06 millions• Population density: 6,480 persons/ km2
• High urban density to meet population growth• Urban heat island and lack of greenery space
• Promote green roofs and vertical greening to achieve urban sustainability
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Green Roofs/ Vertical
Greening
Urban Agriculture
Urban Greenery
Green Building
Sustainability
Food System City Environment
SocialEnvironmental Economic
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The Need for Greenery
• Conventional greening methods• Tree planting and urban parks
• Greening initiatives in buildings• Roof gardens• Sky gardens• Green roofs
• How to maximise the greening effects?• Vertical greening on wall surfaces• Three dimensional greening
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Testing of vertical greening systems (Singapore HortiPark)
(Photo taken by Dr. Sam C. M. Hui)
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D.I.Y. vertical greening systems (Singapore HortiPark)
(Photo taken by Dr. Sam C. M. Hui)
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Three dimensional greening (in Singapore)
(Photo taken by Dr. Sam C. M. Hui)
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The Need for Greenery
• Green or living walls• An emerging technology to integrate vegetation• Saving in land and space for greenery
• Vertical greening technology• Increase greenery in urban area• Developed from green roof technology
• Can offer an ecological benefit complementary to green roofs as the vertical density of ‘plantscaping’ can be enhanced over a building’s façade system in addition to its roof area
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Vertical Greening Systems
• Vertical greening – descriptive terms• Green walls, living walls, bio-walls, living wall/
cladding, green facades, vertical green, vertical gardens, vegetated wall surfaces
• Possible applications:• 1. Building façades or outdoor vertical surfaces • 2. Interior walls or indoor vertical surfaces• 3. Noise barriers (e.g. along the roads)• 4. Slopes
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An example of vertical greening
(Source: CityWalk, Tsuen Wan, www.citywalk.com.hk)
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An example of vertical greening
(Source: CityWalk, Tsuen Wan, www.citywalk.com.hk)
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A green wall in Central
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A green wall project in Kowloon Bay
(18 Kowloon East)
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A green wall project in Wanchai
(The Hennessy)
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Green wall for exhibition function
(Source: www.greening.gov.hk)
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Government demonstration projects
(Source: www.greening.gov.hk)
For a housing estate
For a government building (EMSD Headquarters)
For a school building
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A school green wall project
(Source: www.everplant.com.hk)
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An example of indoor green wall in Hong Kong (at a hotel)
(Source: www.verticalgardenpatrickblanc.com)
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An example of indoor green wall in Hong Kong (at a hotel)
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An indoor green wall in a hotel
(Source: Hotel ICON)
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Indoor green wall
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Indoor green wall
(CityWalk 2, Tsuen Wan)
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Indoor green wall
(International Commerce Centre)
(International Finance Centre)
(Photos taken by Dr Sam C M Hui)
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Indoor green wall in a subway station (Taipei)
(Source: Mr. Eddie Tse)
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Indoor green wall in a subway station (Taipei)
(Source: Mr. Eddie Tse)
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Green noise barrier
(Source: Highway Department, HK)
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Greening on highway structures
(Source: Highway Department, HK)
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Greening on slopes
(Source: Civil Engineering and Development Department)
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(Source: Civil Engineering and Development Department)
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Types and Classification
• Types of vertical greening systems:• 1. Green façades
• Climbing plants, trellis systems, modular trellis panel system, cable and wire-rope net system
• 2. Living/Green walls• Modular green wall, vegetated mat wall
• 3. Interior green walls• 4. Spontaneous living walls
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Types and Classification
• 1. Green façades• Climbing plants or cascading ground covers are
supported on specially designed structures• The plants are either grown in the ground or in
elevated containers where they are watered and fertilised
• The ‘sucker’ roots system of self-clinging plants that attaches to the wall can damage the wall surface
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Types and Classification
• 1.1 Trellis systems• A series of wires or cables is attached to structure ,
allowing the climbing plants to grow up the cables to create a plant screen/wall
• These structures can be attached to the building envelope or can be free standing
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Types and Classification
• 1.2 Modular trellis panel system• A rigid, light weight, three-dimensional panel
made from welded steel that supports plants both on the face grid as well as the panel depth
• This system is designed to keep the green facade off the wall surface so that the plant material cannot attach to the building
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Types and Classification
• 1.3 Cable and wire-rope net system• It uses either cables and/or wire net• Cables are usually designed for faster growing
climbing plants, whereas wire-rope nets are used for supporting slower growing plants that need support at closer intervals
• Both systems use high tensile steel cables, anchors and supplementary equipment
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Types and Classification
• 2. Living/Green walls• Constructed from pre-vegetated panels, vertical
modules or planted blankets (vegetated mat wall) that are fixed to structural framework or to a wall
• Made from steel framework, plastic, expanded polystyrene and synthetic fabric to support a variety of diversity and density of plant species
• Tend to require more maintenance such as fertiliser and water than green facade systems that are planted into the ground
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An example of living wall (Taipei)
(Source: www.sa-space.com)
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Types and Classification
• 2.1 Modular green wall• Consist of panels that hold growing media to
support the plant material• Usually pre-grown, providing an instant effect
after installation• Require irrigation at different levels along the wall
using gravity to move the water through the growing media; similarly nutrient and fertilising is carried out through this method
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Types and Classification
• 2.2 Vegetated mat wall• This system, pioneered by Patrick Blanc, is
composed of two layers of synthetic fabric with pockets filled with the plants and growing media
• The fabric walls are supported on a framework and backed by a waterproof membrane against the building wall
• Nutrients and water are delivered through an irrigation system at the top of the wall
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A living wall in a museum (Paris)
(Source: www.verticalgardenpatrickblanc.com)
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Types and Classification
• 3. Interior green walls• Interior living walls can be constructed from any
of the previous systems• Designed for interior purposes, called the
Biofiltration system (Bio-wall)• With indirect access to light and ventilation• Biophilic qualities that contribute to better health
and air quality
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Types and Classification
• 4. Spontaneous living walls• These are living walls that occur in the urban area
where seeds germinate wherever they can and start growing, usually in hostile environments
• These plants are often garden escapees or weeds that create a new urban habitat or environment to support greater biodiversity in the cities
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Types and Classification
• Two major categories:• Rooted into the ground (climbers; with or without
supporting systems)• Rooted in artificial substrates or potting soil
(modular hydroponic prefab systems)• Two application forms:
• Direct greening: the greening system uses the façade as guide to grow upwards
• Indirect greening: the greening system and the façade are separated with an air cavity
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Types and Classification
• Classification: (proposed)• 1. Modular panel system• 2. Paving system• 3. Climbing or hanging system• 4. Flower pot system• 5. Bag or felt system• 6. Trough system• 7. Climbing or hanging system with trellis• 8. Cable and wire-rope net system
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1. 模塊式/Modular Panel System垂直通道
防水層
生長基質
墻體
滴灌管道
水平擦條
模塊
孔眼
SS Vertical channel
Waterproofing
Wall panel with growing medium
Structure
Drip line
Modular Panel
Perforations
SS Horizontal
purlin
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2. 鋪貼式/Paving System防水層
生長基質
墻體
隔板
栓
滴灌管道
基盤
背襯
Waterproofing
Wall panel with growing medium
Structure
Partition
Tie
Drip line
Basin
External finish
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種植槽
防水層
生長基質
墻體
滴灌管道
3. 攀爬或垂吊式/Climbing or Hanging System
Planter
Waterproofing
Structure
Drip line
Wall panel with growing medium
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支撐結構
種植容器
骨架
生長基質
滴灌管道
4. 擺花式/Flower Pot System
Supporting structure
Growing medium
Backing
Drip line
Wall panel with growing medium
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5. 布袋式/Bag or Felt System防水層
生長基質
墻體
栓
滴灌管道
背襯
氊襯
Waterproofing
Structure
Tie
Drip line
External finish
Felt layer
Wall panel with growing medium
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防水層
生長基質
墻體
栓
滴灌管道
V型種植槽
6. 板槽式/Trough SystemWaterproofing
Structure
Tie
Drip line
Type V Planter
Wall panel with growing medium
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7. 鐵架攀爬或垂吊式/Climbing or Hanging System with Trellis
可生長空間
背襯
種植槽
Access space
External finish
Structure
Planter
Trellis
墻體
鐵架
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8. 鋼索及線網式/Cable and Wire-Rope Net System
鐵箍
鋼索及線網
墻體
滴灌管道
種植槽
Clamp
Cable and wire-rope net
Structure
Drip line
Planter
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Possible Benefits
• Benefits of greenery in urban areas• Air temperature control• Air pollution• Biodiversity & habitat protection• Stormwater management
• Green roofs & vertical greening• Building integrated vegetation• Green infrastructure• Urban cityscape
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Possible Benefits
• Public benefits• Mitigate urban heat island (UHI)• Regulate microclimate & temperature• Improve exterior air quality• Urban aesthetic improvements• Provide ecological habitats• Increase biodiversity• Positive effects on hydrology• Possible urban food production
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(Source: University of Adelaide)
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(Source: University of Adelaide)
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(Source: University of Adelaide)
Rainwater harvesting and storage
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Edible vertical garden
(Source: www.lifeisagarden.com.au)
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Possible Benefits
• Private benefits• Aesthetic effects• Marketing & green image• Improved thermal insulation & energy efficiency• Reduce cooling energy• Protect against solar radiation & rain• Improved indoor air quality• Sound absorption & noise reduction• Credit points for green building assessment
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Energy balance for a green wall
(Source: Ottelé, M., 2011. The Green Building Envelope: Vertical Greening, PhD Thesis, Technical University of Delft, The Netherlands.)
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Infra-red photos of vertical greening (at EMSD Headquarters)
Bare wall Green wall
Temperature of different types of plants
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Key Considerations
• Design factors:• Orientation• Structural support and safety• Selection of plants and system• Irrigation and moisture issues• Damage to wall and deterioration• Maintenance• Building design integration
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(Source: University of Adelaide)
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Key Considerations
• Implications• Increased capital & maintenance costs• Consideration for routine maintenance• Habitat for insects• Orientation & exposure
• Environmentalists• Criticised vertical greening systems for excessive
use of water, energy and chemicals for fertilisation• They can also be difficult to maintain
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Key Considerations
• Factors for successful green façades:• Attachment to building envelope
• How the system will be secured to the building or freestanding structure
• Calculation of structural loads• Plant selection for wind and light exposure,
hardiness zones, and amenity context• Realistic expectations related to plant aesthetics
and growth – some systems require 3 to 5 years
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Key Considerations
• Factors for successful green façades: (cont’d)• Plant maintenance and/or long term maintenance
plan to secure the health of these living systems• Appropriate plant selection for the geographic
region, correct plant spacing for desired coverage, and release from the temporary support structure used by the nursery
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Key Considerations
• Factors for flourishing living walls:• Irrigation (establish appropriate levels of watering
and appropriate levels of nutrients)• Plants correctly specified for hardiness zone and
geographic location• Consider the microclimates that may have
different impacts on one part of a living wall relative to another (e.g. varying light, heat, humidity conditions)
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Key Considerations
• Factors for flourishing living walls: (cont’d)• Growing medium must be designed to sustain
chosen plants and to provide the correct nutritional needs
• Indoor applications need to determine correct light for plant survival
• Check with manufacturers who may have registered or specially trained installers that will be able to complete the project successfully
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THANK YOU 多谢 !!
(More information: www.mech.hku.hk/bse/greenroof/)