zero energy building @ bca academy
ZERO ENERGY BUILDING @ BCA ACADEMY
Ang Kian Seng, Building & Construction Authority
The Challenges Increasing
80% of buildings to be Green Mark certified Expected $1.6B in annual energy savings
Objectives •
To demonstrate that an existing building is able to achieve net zero energy
•
To serve as a test-bed for integration of Green Building technologies (GBTs) in existing building
•
To be a hub for practitioners and students in the study of energy efficiency and green buildings
•
To give the researchers the means to predict the outcome of various GBTs
ZEB Project Team Building Owner
Consultants
Davis Langdon & Seah
Researchers
Contractors ACP CONSTRUCTION PTE LTD
Design and Implementation of ZEB Design Concept: Energy Balance ZEB @ BCA Academy
Solar PV
Grid up load
Consumption
Lighting
Appliances
Grid supply
Air-Con
0
Net Zero
Guiding Principles
Step 1 - Passive Systems Efficient Envelope • Type of window glazing •Type of wall/facade Minimise Solar Heat Gain • Roof garden & vertical greenery •Sunshades Capitalize Daylighting •Mirror ducts •Light pipes •Light shelves
Final step
Step 2 - Active Systems Efficient Lighting •T5 Fluorescent lights •LED task lighting •State-of-the art lighting control systems Efficient ACMV •Personalised Ventilation •Underfloor air distribution system •Single coil twin fans •Solar chimneys Active Control • State-of-the-art building management system
Photovoltaics
Passive Systems
ZEB@BCA Academy Daylight Solutions
ZEB@BCA Academy Performance of Daylighting Systems •
Lighting System Performance – Rated Energy Saving: 12%
7000
Lighting Dimming System VS. Conventional Lighting System
6000
kWh
5000 4000 3000 2000 1000 0 Classrooms
Exhitbition hall
MPC
Lighting Dimming System
Library
CSBC & GBPD
DST
Convenrional Lighting System
School Hall
ZEB@BCA Academy Greenery Systems
ZEB@BCA Academy Performance of Vertical Greenery Systems Surface temperature - vertical greenery system 2 46 44 42
Up to 16oC lower surface temperature
38
36 34 32 30 28 26 24
11:15 PM
9:14 PM
7:13 PM
5:12 PM
3:11 PM
12:09 PM
10:08 AM
8:07 AM
6:06 AM
4:05 AM
2:04 AM
22 12:03 AM
Surface temperature (°C)
40
Time control-internal
control-external
greenery-internal
greenery-external
greenery-on greenery
ZEB@BCA Academy Performance of Vertical Greenery Systems Heat flux - vertical greenery system 2 6
5
Up to 5W/m2 reduced heat transfer
3
2
1
-2
Time control
greenery
11:15 PM
9:14 PM
7:13 PM
5:12 PM
3:11 PM
12:09 PM
10:08 AM
8:07 AM
6:06 AM
4:05 AM
-1
2:04 AM
0 12:03 AM
Heat flux (W/m²)
4
ZEB@BCA Academy Performance of Greenery Systems Maximum difference with control wall Greenery system
External surface temperature
Heat flux
Ambient temperature
Energy savings based on heat flux difference
Vertical greenery system 1
10°C
4 W/m²
2°C higher
4.16 kWh/m²/year
Vertical greenery system 2
16°C
3.5-5 W/m²
2-3°C higher
5.72 kWh/m²/year
Vertical greenery system 3
6°C
1.75 W/m²
2°C lower
2.86 kWh/m²/year
Rooftop greenery system
24°C
53 W/m²
7°C lower
70.2 kWh/m²/year
ZEB@BCA Academy Pioneering Use of Materials Solar Assisted Stack Ventilation Roof metal ventilation duct
Metal vertical ventilation duct
Solar chimney
SOLAR ASSISTED STACK VENTILATION
West facade 1
Solar radiation heats the chimney and ducts
West facade 2
West facade
West facade 3
Hot air flows out from the room
Hot air flows out of the ducts
4
Fresh air is induced to flow into the room
ZEB@BCA Academy Performance of Solar Chimney
ZEB@BCA Academy Performance of Solar Chimney
Active Systems
ZEB@BCA Academy Personalised ventilation
Single Coil Twin Fan
Sensors, T5 lights, task lights Displacement Ventilation
ZEB@BCA Academy Innovation in Technology Single Coil Twin Fan
Potential Benefits • Estimated 7 - 8% capital cost premium • Predicted overall energy savings of about 13% • Improved indoor air quality and comfort • Attractive payback period < 3 years
ZEB@BCA Academy Performance of SCTF
ZEB@BCA Academy Performance of SCTF with PV
Significant reduction in fresh air
Personalised ventilation
ZEB@BCA Academy Performance of SCTF
With PV
ZEB@BCA Academy Photovoltaics
ZEB@BCA Academy Extend of Photovoltaic Coverage
ZEB@BCA Academy
ZEB@BCA Academy Performance of Photovoltaic Systems
BIPV Generation (MWh)
Design
Operation
207
203
Achievements
ZEB@BCA Academy Results
BCA Green Mark Scheme
Raising Energy Efficiency Standard over 2005 design codes
GM V3
GM V 4
ZEB as Learning Journey 10,763 Visitors since Oct 2009 STUDENTS PROFESSIONALS
ACADEMIC, 536
PUBLIC, 691
PUBLIC OFFICERS ACADEMIC PUBLIC
STUDENTS, 4061
GOV’T OFFICIALS, 2169 PROFESSIONALS, 3306
LOCAL
FOREIGN, 2249
FOREIGN
LOCAL, 8514
Exporting ZEB and Expertise Leaving Sustainable Footprints
Tianjin Eco-city ZEB
Conference & Exhibition Sharing Experiences, Creating Awareness
Accolades
Tianjin Eco-city ZEB Architecture Sky garden Light pipes BIPV & AIPV (South) Vertical green wall on the south façade Light shelves Integrated façade design
Mechanical/Electrical Ground channel for wind during transition periods Radiant floor heating for winter Demand controlled ventilation for fresh air through CO2 sensors
Thank you
Ang Kian Seng, Building & Construction Authority
The Challenges Increasing
80% of buildings to be Green Mark certified Expected $1.6B in annual energy savings
Objectives •
To demonstrate that an existing building is able to achieve net zero energy
•
To serve as a test-bed for integration of Green Building technologies (GBTs) in existing building
•
To be a hub for practitioners and students in the study of energy efficiency and green buildings
•
To give the researchers the means to predict the outcome of various GBTs
ZEB Project Team Building Owner
Consultants
Davis Langdon & Seah
Researchers
Contractors ACP CONSTRUCTION PTE LTD
Design and Implementation of ZEB Design Concept: Energy Balance ZEB @ BCA Academy
Solar PV
Grid up load
Consumption
Lighting
Appliances
Grid supply
Air-Con
0
Net Zero
Guiding Principles
Step 1 - Passive Systems Efficient Envelope • Type of window glazing •Type of wall/facade Minimise Solar Heat Gain • Roof garden & vertical greenery •Sunshades Capitalize Daylighting •Mirror ducts •Light pipes •Light shelves
Final step
Step 2 - Active Systems Efficient Lighting •T5 Fluorescent lights •LED task lighting •State-of-the art lighting control systems Efficient ACMV •Personalised Ventilation •Underfloor air distribution system •Single coil twin fans •Solar chimneys Active Control • State-of-the-art building management system
Photovoltaics
Passive Systems
ZEB@BCA Academy Daylight Solutions
ZEB@BCA Academy Performance of Daylighting Systems •
Lighting System Performance – Rated Energy Saving: 12%
7000
Lighting Dimming System VS. Conventional Lighting System
6000
kWh
5000 4000 3000 2000 1000 0 Classrooms
Exhitbition hall
MPC
Lighting Dimming System
Library
CSBC & GBPD
DST
Convenrional Lighting System
School Hall
ZEB@BCA Academy Greenery Systems
ZEB@BCA Academy Performance of Vertical Greenery Systems Surface temperature - vertical greenery system 2 46 44 42
Up to 16oC lower surface temperature
38
36 34 32 30 28 26 24
11:15 PM
9:14 PM
7:13 PM
5:12 PM
3:11 PM
12:09 PM
10:08 AM
8:07 AM
6:06 AM
4:05 AM
2:04 AM
22 12:03 AM
Surface temperature (°C)
40
Time control-internal
control-external
greenery-internal
greenery-external
greenery-on greenery
ZEB@BCA Academy Performance of Vertical Greenery Systems Heat flux - vertical greenery system 2 6
5
Up to 5W/m2 reduced heat transfer
3
2
1
-2
Time control
greenery
11:15 PM
9:14 PM
7:13 PM
5:12 PM
3:11 PM
12:09 PM
10:08 AM
8:07 AM
6:06 AM
4:05 AM
-1
2:04 AM
0 12:03 AM
Heat flux (W/m²)
4
ZEB@BCA Academy Performance of Greenery Systems Maximum difference with control wall Greenery system
External surface temperature
Heat flux
Ambient temperature
Energy savings based on heat flux difference
Vertical greenery system 1
10°C
4 W/m²
2°C higher
4.16 kWh/m²/year
Vertical greenery system 2
16°C
3.5-5 W/m²
2-3°C higher
5.72 kWh/m²/year
Vertical greenery system 3
6°C
1.75 W/m²
2°C lower
2.86 kWh/m²/year
Rooftop greenery system
24°C
53 W/m²
7°C lower
70.2 kWh/m²/year
ZEB@BCA Academy Pioneering Use of Materials Solar Assisted Stack Ventilation Roof metal ventilation duct
Metal vertical ventilation duct
Solar chimney
SOLAR ASSISTED STACK VENTILATION
West facade 1
Solar radiation heats the chimney and ducts
West facade 2
West facade
West facade 3
Hot air flows out from the room
Hot air flows out of the ducts
4
Fresh air is induced to flow into the room
ZEB@BCA Academy Performance of Solar Chimney
ZEB@BCA Academy Performance of Solar Chimney
Active Systems
ZEB@BCA Academy Personalised ventilation
Single Coil Twin Fan
Sensors, T5 lights, task lights Displacement Ventilation
ZEB@BCA Academy Innovation in Technology Single Coil Twin Fan
Potential Benefits • Estimated 7 - 8% capital cost premium • Predicted overall energy savings of about 13% • Improved indoor air quality and comfort • Attractive payback period < 3 years
ZEB@BCA Academy Performance of SCTF
ZEB@BCA Academy Performance of SCTF with PV
Significant reduction in fresh air
Personalised ventilation
ZEB@BCA Academy Performance of SCTF
With PV
ZEB@BCA Academy Photovoltaics
ZEB@BCA Academy Extend of Photovoltaic Coverage
ZEB@BCA Academy
ZEB@BCA Academy Performance of Photovoltaic Systems
BIPV Generation (MWh)
Design
Operation
207
203
Achievements
ZEB@BCA Academy Results
BCA Green Mark Scheme
Raising Energy Efficiency Standard over 2005 design codes
GM V3
GM V 4
ZEB as Learning Journey 10,763 Visitors since Oct 2009 STUDENTS PROFESSIONALS
ACADEMIC, 536
PUBLIC, 691
PUBLIC OFFICERS ACADEMIC PUBLIC
STUDENTS, 4061
GOV’T OFFICIALS, 2169 PROFESSIONALS, 3306
LOCAL
FOREIGN, 2249
FOREIGN
LOCAL, 8514
Exporting ZEB and Expertise Leaving Sustainable Footprints
Tianjin Eco-city ZEB
Conference & Exhibition Sharing Experiences, Creating Awareness
Accolades
Tianjin Eco-city ZEB Architecture Sky garden Light pipes BIPV & AIPV (South) Vertical green wall on the south façade Light shelves Integrated façade design
Mechanical/Electrical Ground channel for wind during transition periods Radiant floor heating for winter Demand controlled ventilation for fresh air through CO2 sensors
Thank you
