Zero Carbon Building Christopher TO Construction Industry Council
Construction Industry Council • Set up under the Construction Industry Council Ordinance (Cap.587) • Functions of the CIC are stipulated in Sections 5&6 of the Construction Industry Council Ordinance (Cap.587) Reflect Needs and Aspirations Elevate the Enhance Quality and Cohesiveness Functions Competitiveness of CIC Enhance Advance Skills Promote Good Cohesiveness Through Training Practices 2
Introduction Promoting the ongoing development and improvement of industry Encouraging research activities and the use of innovative techniques and to establish or promote the establishment of standards for the construction industry Promoting good practices in the construction industry in relation to…, environmental protection,…
Background • Hong Kong Government has recently targeted for Carbon Reductions (50% to 60% Carbon Intensity Reduction by 2020 compared to 2005 baseline) • Buildings consume 90% electricity and are responsible for 60% Greenhouse gases (GHG) emissions in HK – Construction industry has a significant role to play in GHG emission reduction
Objectives Serving as an exhibition and education centre - To showcase the state-of-the-art eco-building design and technologies to the construction industry internationally and locally as well as to raise community awareness of sustainable living in Hong Kong - To promote the green living and working and the human behavioural changes which can contribute to the GHG emission reduction
8 Sheung Yuet Road Kowloon Bay
Kowloon East
Landscape Master Plan ZCB Cafe Eco-Plaza Shop Eco-Terrace Outdoor Exhibition Areas Commercial Area Urban Native Woodland : Biodiversity in urban area D-01
Hopefully, in 2 years’ time… D-01
Basement / Ground Floor Plan
Ground Floor Plan
Ground Floor Plan
Ground Floor Plan
Ground Floor Plan
Mezzanine Floor Plan
Mezzanine Floor Plan
Programme • Inception Oct 2010 • Commencement of Study and Design Apr 2011 • Commencement of construction July 2011 • Project completion Jun 2012 • Official opening Jun 2012 • Public opening Sep 2012
Significance of ZCB • 1 st zero-carbon building in HK • 1 st building with grid feed-in in HK • 1 st native urban woodland in HK • One of the 1 st BEAM Plus Platinum new building projects • 1 st large scale use of biodiesel made from waste cooking oil for electricity generation • One of the few ZCBs in the world that account for carbon emissions during the operation stage as well as the embodied carbon of the construction process and the major structural materials
Key Features • Carbon neutral • Energy positive • Climate positive • Experimenting • Evaluating • Evolving • Educating
Key Design Features Zero Carbon Passive Active Outdoors Renewable Others Design Systems Technologies Climate-responsive Built Form and High Greenery High-Volume-Low- Bio-fuel Tri- Coverage Orientation Speed Fans generation Plant Water Use Ultra-Low Overall Management Thermal Transfer Value (OTTV) Urban Native High Temperature Photovoltaic Woodland Cooling System High Performance Glazing System Smart Controls / Eco-paver and Building Low Embodied Grasscrete as Management Carbon Materials Pervious Surfaces Wind Catchers and Thematic System Light Pipes Showcases for Eco-workplace and Sustainable Low Embodied Living Microclimate Air Tree Carbon Earth Cooling Tube Monitoring Stations Construction
Design Strategy – Climate Positive
Greenery + Cool Materials
Key Design Feature High Greenery Coverage • About 50% for greenery coverage of the site, including vertical greening • Tree ratio at about 200 trees per hectare • Existing mature trees within the site in good conditions are preserved. • The high degree of greenery serves as “carbon sink” to absorb carbon dioxide as well as “heat sink” to cool summer prevailing winds and reduce the heat island effect.
Key Design Feature Urban Native Woodland • Over 150 native trees, with over 40 different species in the woodland • Native woodland area of about 2,000m 2 (over 20% of the site) • Diversity of native species enhances biodiversity to provide food and shelter to attract native wildlife into the city.
Key Design Feature Eco-Paver and Grasscrete • Act as pervious surfaces which allow water permeation and act as cool materials to help reduce heat island effect • Eco-paver has a top layer with titanium dioxide which has the added value for air pollutant removal
Key Design Feature Air Tree • A covered walkway system cladded with sustainable timber providing shade, cooling air breeze and a framework for climbing plants • Cooling breeze is accentuated by ceiling fans • Reduction of uncovered impervious surface and associated heat island effect
Key Design Feature Climate-responsive Built Form & Orientation • Optimize beneficial use of wind, sun and daylight • Reduce the demand for mechanical heating/cooling and artificial lighting • Main façade facing SE to capture prevailing summer breeze • Tapered built form to draw stronger airflow across the building and to reduce exposure solar heat gain from the south façade and increase daylight from the north façade • Elongated built form to reduce façade areas towards the East and West
Key Design Feature Ultra-Low OTTV • The lower the overall thermal transfer value (OTTV), the smaller the solar heat gain through building fabric and the cooling load for air conditioning • OTTV of ZCB at 11W/m 2 , about 80% lower than statutory requirement at time of completion • Due to optimized window-to-wall radio, deep overhang over the south façade, external shading fins, minimized east and west facades/windows, high performance glass wall system, and shaded and insulated roof
Key Design Feature High Performance Glazing System • To lower cooling load and reliance on artificial lighting • U value is kept as low as 1.6 W/m2 based on the Insulated Glazed Unit construction with low-e coating • Low Shading Coefficient (SC) at 0.33 and relatively high Visual Light Transmittance (VLT) at 0.54
Key Design Feature Wind Catchers & Light Pipes • On top of the design for cross ventilated and daylight layout, wind catchers and light pipes are provided on the rooftop to enhance natural ventilation and daylighting for areas furthest away from windows
Key Design Feature Earth Cooling Tube • Provided near the building for pre-cooling of fresh air by making use of the cooler thermal mass of the earth • Reduce cooling load and energy use due to the passive pre-cooling of the incoming air • The temperature difference between the air and the earth mass in the summer at about 5ºC maximum.
Key Design Feature High-Volume-Low-Speed Fans • Patented blades design to enhance evaporation for comfort
Key Design Feature High-Temperature Cooling System • Comprises chilled beams, underfloor displacement cooling and desiccant dehumidification • Higher supply air temperature allowing greater extent of free-cooling (number of hours suitable for free cooling increases from 200 hours to 600 hours each year)
Key Design Feature Smart Controls/ BMS • The building monitors itself constantly, so that the active and other building systems can be evaluated and optimized for their operation and environmental performance
Key Design Feature Microclimate Monitoring Stations • 4 micrcoclimate monitoring stations are placed on and around the building to evaluate how the building performs and interacts with its surroundings • These monitoring stations offer critical data to the Intelligent BMS for optimization of building environmental performance in response to actual microclimatic conditions.
Key Design Feature Water Use Management • 3 Eco-toilets making use of waterless urinals, low-flow sanitaryware and grey water recycling • 1 toilet is equipped with black water recycling treatment • Stormwater harvesting • Artificial wetland with subsurface flow to treat grey water/stormwater by the roots of plants
Energy Strategy Energy Hierarchy Renewable Active Systems
Reduction of Energy Demand Passive Active Design Systems 25% 20%
Renewable Energy Generation Biodiesel PV Panels Solar Water Tri- Heating - multi- generation crystalline System - BIPV - CIGS
Renewable Energy Bio-fuel Tri-generation Plant • 1 st large-scale use of bio-diesel as a renewable tri- generation (a combined Cooling, Heating and Power <CCHP> system) • Waste-to-energy (bio-diesel produced from waste cooking oil) • Generate 143 MWh per year • Capture 70% of the fuel energy (adsorption cooling / desiccant dehumidification), compared to 40% for conventional energy supply through grid electricity where the bulk of fuel energy is rejected into the sea or atmosphere.
CCHP Power + Cooling + Dehumidification
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