Zero Carbon Building. Christopher TO Construction Industry Council

Transcription

1 Zero Carbon Building Christopher TO Construction Industry Council

2 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) Enhance Cohesiveness Enhance Advance Skills Cohesiveness Through Training Reflect Needs and Aspirations Functions of CIC Elevate the Quality and Competitiveness Promote Good Practices 2

3 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,

4 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

5 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

6 8 Sheung Yuet Road Kowloon Bay

7 Kowloon East

8 Landscape Master Plan ZCB Eco-Plaza Cafe Shop Eco-Terrace Commercial Area Outdoor Exhibition Areas Urban Native Woodland: Biodiversity in urban area D-01

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10 Hopefully, in 2 years time D-01

11 Basement / Ground Floor Plan

12 Ground Floor Plan

13 Ground Floor Plan

14 Ground Floor Plan

15 Ground Floor Plan

16 Mezzanine Floor Plan

17 Mezzanine Floor Plan

18 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

19 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

20 Carbon neutral Energy positive Climate positive Experimenting Evaluating Evolving Educating Key Features

21 Key Design Features Outdoors Passive Design Active Systems Zero Carbon Renewable Technologies Others High Greenery Coverage Climate-responsive Built Form and Orientation High-Volume-Low- Speed Fans Bio-fuel Trigeneration Plant Urban Native Woodland Ultra-Low Overall Thermal Transfer Value (OTTV) High Temperature Cooling System Photovoltaic Water Use Management Eco-paver and Grasscrete as Pervious Surfaces Air Tree High Performance Glazing System Wind Catchers and Light Pipes Earth Cooling Tube Smart Controls / Building Management System Microclimate Monitoring Stations Low Embodied Carbon Materials Low Embodied Carbon Construction Thematic Showcases for Eco-workplace and Sustainable Living

22 Design Strategy Climate Positive

23 Greenery + Cool Materials

24 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.

25 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.

26 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

27 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

28 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

29 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

30 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

31 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

32 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.

33 Key Design Feature High-Volume-Low-Speed Fans Patented blades design to enhance evaporation for comfort

34 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)

35 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

36 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.

37 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

38 Energy Strategy Energy Hierarchy Renewable Active Systems

39 Reduction of Energy Demand Passive Design Active Systems 20% 25%

40 Renewable Energy Generation Biodiesel Trigeneration System PV Panels - multicrystalline - BIPV - CIGS Solar Water Heating

41 Renewable Energy Bio-fuel Tri-generation Plant 1 st large-scale use of bio-diesel as a renewable trigeneration (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.

42 CCHP Power + Cooling + Dehumidification

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44 Renewable Energy Photovoltaic Solar irradiance of the whole site with reference to surrounding context and neighbouring buildings has been studied to determine the best location for the building to receive the solar energy Generate 87 MWh per year (over 60% of ZCB consumption) 3 different types of PV are used: 1015m 2 multi-crystalline on the inclined roof (about 80% of the roof) BIPV-thin film covering the viewing platform, and cylindrical CIGS thin film integrated in the air tree

45 Multi-Crystalline BIPV CIGS

46 Energy Plus Carbon Strategy Emissions embodied in materials 1,400 tonnes Emissions during construction 150 tonnes 4,600 tonnes Emissions during operation (92 tonnes per year) Total 6150 tonnes On-site renewable energy offset 8,080 tonnes (161 tonnes per year) 50 years Net energy output over operating energy consumption to offset embodied carbon of major structural materials & construction 8,080 tonnes

47 Low Embodied Carbon Materials Regionally manufactured materials Sustainable timber Reinforced concrete with steel rebar with recycled content and high percentage of Pulverized Fly Ash Consume less energy or emit less carbon in their process of extraction, manufacturing and transportation

48 Low Embodied Carbon Construction Balanced cut and fill for the site formation works Gabion wall construction making use of construction debris salvaged from demolition

49 Performance Construction Stage CO 2 Reduction Reference CO 2 Emission Target CO 2 Emission of This ZCB Reduction Construction Process Material Use 2200 t 150 t 1400 t 30%

50 Performance Operation Stage CO 2 Reduction and Energy Savings in Building Typical Design Measures Taken in Design to Reduce CO 2 Building CO 2 Emission Building CO 2 Reduction (ton CO 2 /yr) 140 t/yr CO 2 Reduction (% of total building) Building Energy Consumption 200 MWh/yr Building Energy Saving (MWh/yr) Energy Saving (% of total building) Envelope design Ventilation design Lighting design Cooling design Total Reduction CCHP Generation (generated) N/A PV Generation (generated) N/A Energy Consumption: <100 kwh/sqm/yr 46% less than the baseline of HK s Building Energy Code (BEC)

51 Thank You