measurable means to achieve impeccable built environment
TRANSCRIPT
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M o n d a y , D e c e m b e r 1 0 , 2 0 1 2
SIXTH SHADE
M e a s u r a b l e m e a n s t o a c h i e v e i m p e c c a b l e b u i l t e n v i r o n m e n t
R a j a n R a w a l
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Source: NASA Scientific Visualization Studio Collection
Earth lights at night
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Source: http://www-personal.umich.edu/~mejn/cartograms/population1024x512.png
Our Population
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Source: http://www-personal.umich.edu/~mejn/cartograms/population1024x512.png
Our Gross Domestic Product
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Our Child Mortality
Source: http://www-personal.umich.edu/~mejn/cartograms/population1024x512.png
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Our Total Spending on Heath care
Source: http://www-personal.umich.edu/~mejn/cartograms/population1024x512.png
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Our Energy Consumption
Source: http://www-personal.umich.edu/~mejn/cartograms/population1024x512.png
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Our Green House Gas Emission
Source: http://www-personal.umich.edu/~mejn/cartograms/population1024x512.png
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9 / 5 11 1 D e c e m b e r 2 0 1 2 , R a j a n R a w a l a t G R I H A , B a n g a l o r eSource: http://www.interacademycouncil.net/CMS/Reports/11840/11901/11907.aspx
Access to Energy and Human Development Index
Move UpButWithout Moving to Right Side
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Buildings and Cities provide shelter, facilitate our activities & interactions, and
represent our desires and provide cultural expression.
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………………………………………………………………………2030
70 % of the India of 2030 is yet to be built
Electricity Demand , exceeds available supply………..Commercial buildings accounts for about 8% of the total electricity supplied by utilities -
Growing annually at about 11-12% - resulting to peak shortages of about 8.3% and 12.3%...............
Source: Rajan Rawal
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Pace versus Speed ………
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When : Where : Why : Who : What : How
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WATERAIR
WINDEARTH
EITHER
5 ElementsHow do we use them favorably?
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HEARINGSIGHT
SMELLTOUCH
TASTE
5 SensesHow do we use them effectively?
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CONCEPTUALIZEIMAGINE
OPERATE
MATERIALIZE
DESTROY
5 SensesHow do we measure their impact?
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MEASUREMaterial
CostTime
Structural strengthWater – Sanitation
ENERGY ? (Can not rely only on common sense approach)
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NOT ONLY INTUTION BUT SCIENTIFIC PREDICTION
6th ShadeEXPERIMENT – LEARN – DOCUMENT – DISSEMINATE - INGRAINED
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“A great building must begin with the unmeasurable,
must go through measurable means when it is being designed and
in the end must be unmeasurable.”
Source: thinkexist.com/quotation/a_great_building_must_begin_with_the_unmeasurable/213937.html
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Centre for Advanced Studies in Building Science and EnergyCEPT University, Ahmedabad
(Centre for Building Energy Efficiency – USAID)(Centre for Solar passive Architecture and Green Building Technologies – Govt. of India)
(Centre for Building Energy Research and Development in collaboration with LBNL)
Building Design & Simulation
Building Material &
Component Characterization
Building Policy Research
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Centre for Advanced Studies in Building Science and EnergyCEPT University, Ahmedabad
Snapshot of Work
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250 Building Material Characterized
Building Construction Assemblies – Online Database –U Factor/Thermal Conductivity –Specific Heat – Density
Online Calculator
Coupling with EPI tool of BEE
Construction Material Database: Material Characterization : Wall - Roof
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01234567
00.10.20.30.40.50.60.70.8
00.10.20.30.40.50.60.70.8
FIXED WINDOW CASEMENT WINDOW SLIDING WINDOW
ECBC RECOMMENDED:0.27 Min.
ECBC RECOMMENDED: 0.25 Max.
ECBC RECOMMENDED: 3.3.
CLEAR BLUE GREEN COATED COATED CLEAR CLEAR LOW-E COATED LOW-EGLASS TINTED TINTED BLUE GREEN +CLEAR +LOW-E +CLEAR +LOW-E +LOW-E
CLEAR BLUE GREEN COATED COATED CLEAR CLEAR LOW-E COATED LOW-EGLASS TINTED TINTED BLUE GREEN +CLEAR +LOW-E +CLEAR +LOW-E +LOW-E
U-VA
LUE
SHGC
VLT
CLEAR BLUE GREEN COATED COATED CLEAR CLEAR LOW-E COATED LOW-EGLASS TINTED TINTED BLUE GREEN +CLEAR +LOW-E +CLEAR +LOW-E +LOW-E
Construction Material Database: Material Characterization : Fenestration
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Increasing Energy Efficiency
Number of
Buildings
ECBC
BAU Building Stock
Bundle 1
Bundle 2
Bundle 3
ECBC Compliant
Bundles of ECBC Requirements
Source: CEPT-The Weidt Group Study
Technical inputs for ECBC Implementation
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Hot-Dry
Cold
Warm-Humid
TemperateComposite
Savings PatternsSavings Patterns
0 25 50 75 100 125 150 175 200 225Envelope Insulation Measures
Windows Comp,Hot-Dry,Warm-Humid
Windows Moderate
Windows Cold
Projections Shading
Lighting Controls
Lighting Power DensityPackaged AC, Air-cooled
Packaged AC, Water-cooled
Unitary AC
Split ACChillers, Air-cooled
Chillers, Water-cooled
Pumps, Motors
Kwh/m2
Source: CEPT-The Weidt Group Study
Technical inputs for ECBC Implementation
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Impact of Vegetation on Ambient Air Temperature
Case 1 (Plot plantation) Case 2 (Plot plantation) Case 3 (Road plantation) Case 4 (Road plantation)
Case 5 (Combination plantation) Case 6 (Combination plantation)
Case 7 (Combination plantation)
Case 8 (Combination plantation)
Technical inputs for Building laws for Gandhinagar for Tree Plantation
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Incident Solar radiation received on street
Obstruction angle 50°,H/W ratio 1.2
Obstruction angle 60°,H/W ratio 1.7
Obstruction angle 70°,H/W ratio 2.6
Obstruction angle 80°,H/W ratio 5.7
N-S74% shaded 81% shaded 87% shaded 94% shaded
E-W52% shaded 61% shaded 71% shaded 82% shaded
NW-SENE-SW 68% shaded 76% shaded 84% shaded 93% shaded
Street Hierarchy Main road Secondary Inner Street N S
E W
Source: Kanika Agrawal, CEPT University
Technical inputs for Town Planning Scheme for Gujarat
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Design development – Mutual Shading Shade and radiation analysis: Resultant built mass models Diagrammatic representation Source: Kanika Agrawal, CEPT University
Technical inputs for Town Planning Scheme for Gujarat
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Understanding Vernacular Architecture : Window Configurations
Source: Mihir Vakharia, CEPT University
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Understanding Vernacular Architecture: Daylight Performance of Trellis: Lattice ‘Jali’
Source: Dharmesh Gandhi, CEPT University
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Understanding Vernacular Architecture: Daylight Performance of Trellis: Lattice ‘Jali’
Source: Dharmesh Gandhi, CEPT University
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Adaptive Thermal Comfort Model for India: On Going WorkASHRAE 55 Adaptive thermal comfort model
Five Climate Zone
Air-conditioned – Mixed Mode and Naturally ventilated Buildings
Winter – Summer – Monsoon
Indian benchmark - International Benchmark
9000 Occupants across five climate zones
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Centre for Advanced Studies in Building Science and EnergyCEPT University, Ahmedabad
Near Net Zero Energy Building
A Living Laboratory
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Net / Near Zero Energy Building – A Living Laboratory
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ASHRAE 55 thermal comfort based on the mean monthly temperature for Ahmedabad, India
Typical Annual ASHRAE 55 Operative Temperature Comfort Bands for Naturally Ventilated in Ahmedabad , India
Net / Near Zero Energy Building – A Living Laboratory
Source: Built Ecology,
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Daylighting Parameters Cloud Cover
Direct Solar Radiation Sunpath Diagram
Net / Near Zero Energy Building – A Living Laboratory
Source: ECOIII, The Weidt group, CEPT University
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Base Case No light shelf(70 deg cut-off)
Option 1 500 light shelf(39 deg cut-off)
Option 2 800 light shelf(30 deg cut-off)
Sun Control Analysis South Facing ClerestoryNet / Near Zero Energy Building – A Living Laboratory
Source: ECOIII, The Weidt group, CEPT University
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Illuminance of floor plan under clear sky Basement level
With 67% VT on East & West
With 33% VT on East & West
Reduced VT helps reduce high contrast/glare near windows
Net / Near Zero Energy Building – A Living Laboratory
Source: ECOIII, The Weidt group, CEPT University
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Continuous Daylight Autonomy (300 lux) on Work Plane Basement level
Reduced VLTdecreases DAby about 10%throughout
Net / Near Zero Energy Building – A Living Laboratory
Source: ECOIII, The Weidt group, CEPT University
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Reduced VLT increases UDI(<100) by about 6% throughout
Useful Daylight Index (<100) on Work Plane Basement levelNet / Near Zero Energy Building – A Living Laboratory
Source: ECOIII, The Weidt group, CEPT University
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Useful Daylight Index (>2000) on Work Plane Basement level
Reduced VT reduced UDI(>2000) by UP TO 30% !
Net / Near Zero Energy Building – A Living Laboratory
Source: ECOIII, The Weidt group, CEPT University
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With opaque partition wallWith glass partition wall
Luminance views under clear sky I Floor
Net / Near Zero Energy Building – A Living Laboratory
Source: ECOIII, The Weidt group, CEPT University
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Integrated Disciplines: Progress ImagesNet / Near Zero Energy Building – A Living Laboratory
Source: London Info, CEPT University
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Integrated Disciplines: Progress ImagesNet / Near Zero Energy Building – A Living Laboratory
Source: London Info, CEPT University
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Thermal Comfort Analysis: Velocity Contours
Net / Near Zero Energy Building – A Living Laboratory
Velocity Contours : at 0.5 meter height Velocity Contours : at 1.2 meter heightSource: Mecharts,& CEPT University
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Thermal Comfort Analysis: Predicted mean Vote and Percentage People Dissatisfied
Net / Near Zero Energy Building – A Living Laboratory
PMV at 1.0 meter height PPD at 1.0 meter heightSource: Mecharts,& CEPT University
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When you can measure what you are speaking about, and express it in numbers,You know something about it, but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind
Lord William Thomson Kelvin