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Glass Windows
In Building Envelope & Energy
Efficiency
Emelito Punsalan
United Architects of the Philippines
UAP- Green Architecture Movement
Philippine Green Building Initiative
ASHRAE, Philippines Chapter
LR Punsalan & Associates
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
HISTORY
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
HISTORY
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
HISTORY
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
HISTORY
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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SITUATIONER
There is
demand for buildings
Energy Cost
Climate Change
Gla
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indow
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Build
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Ar
Em
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o C
Punsala
n,
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25 N
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014
Arc
ht E
C P
unsala
n –
Susta
inabili
ty &
Gre
en B
uild
ings-P
GB
I T
echnic
al S
em
inars
, 2011
http://www.businessinsider.com/images-of-the-philippines-before-and-after-super-typhoon-haiyan-2013-11?op=1
SITUATIONER
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
http://i133.photobucket.com/albums/q70/changturtle/
religion/globalwarming.jpg?t=1229109606
http://www.theguardian.com/environment/2013/nov/18/typhoon-haiyan-spur-climate-change-action
Photograph: NOEL CELIS/AFP/Getty Images
http://www.citynews.ca/2013/11/21/taclobans-children-face-uncertain-future-after-
typhoon-haiyan/ GETTY IMAGES/AFP PHOTO/Ted Aljibe.
SITUATIONER
Gla
ss W
indow
s in
Build
ing E
nvelo
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nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
http://healthandenergy.com/images/smokestack_tall.jpg
http://healthandenergy.com/images/smog_in_the_city.jpg
http://www.napocor.gov.ph/generations/MY
WEB/images/Plant%20Pics/Masinloc.jpg
SITUATIONER
Gla
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indow
s in
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Ar
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Buildings account
for 36% of the
national energy
consumption
10
2010 ENERGY CONSUMPTION BY SECTOR
BUILDINGS
36%
INDUSTRY
26%
TRANSPORT
37%
AFF
1%
Energy Use Profile in the Philippines
2010 DOE Key Energy Statistics Philippines
SITUATIONER
Gla
ss W
indow
s in
Build
ing E
nvelo
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y E
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iency –
Ar
Em
elit
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Punsala
n,
PG
BI,
25 N
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Electrical Consumption Projection (2011 to 2030) 11
Power Consumption Data from DOE Power Statistics, 2011; Conversion to GHG emissions using US EPA Calculator
Gla
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indow
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iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
SITUATIONER
12
Gla
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indow
s in
Build
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nvelo
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nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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SITUATIONER
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
1 2 3 4 5 6 7 8 9 10 11
Infl
atio
n R
ate
in %
Year 2000
Ave. Inflation Rate 4.5%
-
20,000
40,000
60,000
80,000
100,000
120,000
140,000
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
Industrial
Commercial
Residential
Gla
ss W
indow
s in
Build
ing E
nvelo
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nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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SITUATIONER
http://img.alibaba.com/photo/206948658/Angle_Steel_Tower.jpg
Gla
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indow
s in
Build
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nvelo
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iency –
Ar
Em
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Punsala
n,
PG
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25 N
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SITUATIONER
24 HOURS
WIND
HUMIDITY
POLLUTION
NOISE
DIAGNOSIS
The Building Envelope
Gla
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indow
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…encompasses the entire exterior surface of a
building, including walls, doors, and windows, which enclose, or envelop, the interior
spaces.
-Barbara Nadel FAIA, 21st Century Building Envelope Systems
AIA/Architectural Record Continuing Education Series
The Building Envelope
BUILDING ENVELOPE
Gla
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indow
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Ar
Em
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Punsala
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Mold and mildew
BUILDING ENVELOPE
Energy costs
Infiltration
Maintenance
Thermal
Lighting
Arc
ht E
C P
unsala
n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
Gla
ss W
indow
s in
Build
ing E
nvelo
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iency –
Ar
Em
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Punsala
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DESIGNING THE
BUILDING
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indow
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y E
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Ar
Em
elit
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Punsala
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PG
BI,
25 N
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Compact Fluorescent Lamps (CFL) Tubular Fluorescent Lamps
Generally, walls are in Concrete / CHB.
Some have overhangs
Generally, tinted single glazing in
aluminum framing
Ave. WWR > 25%
Variable Refrigerant Flow (VRF) Chilled Water System < ½ use VSD
Office
Buildings
Gla
ss W
indow
s in
Build
ing E
nvelo
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nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
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Building Indoor
Protection
Building
Insulation
Shading Factor
Views & Daylight
Efficient Lamps
Lighting Power
Density
Lighting Control
Daylighting
Ventilation
Rates
Equipment
Efficiencies
AC Control
System Design
DIAGNOSIS
Gla
ss W
indow
s in
Build
ing E
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iency –
Ar
Em
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Punsala
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PG
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MINIMUM STANDARDS
Arc
ht E
C P
unsala
n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
MINIMUM STANDARDS
BUILDING ENVELOPE
1. Thermal Heat Conduction &
Solar Heat Radiation
2. U-value and R-value for walls and
roof • U-value <= 0.151 (walls)
• R-value >= 6 (walls)
• U-value <= 0.044 (metal roof)
3. U-Value, SHGC and VLT for windows • U-value <= 0.47
• SHGC <= 0.35 (north)
<= 0.25 (south, east & west)
Gla
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indow
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Ar
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Punsala
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Prescriptive Requirements
Maximum U-values;
Maximum Solar heat gain coefficient (SHGC) values;
Limited glazing area or Window-to-Wall Ratio (WWR).
If these requirements are met, the building envelope complies with
the Standards.
-CEC 2005 BUILDING ENERGY EFFICIENCY STANDARDS
MINIMUM STANDARDS
Gla
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indow
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Build
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Ar
Em
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Punsala
n,
PG
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Mandatory Measures - The mandatory measures for
doors, windows, and skylights address the airtightness of
the units and how their U-factor and SHGC are
determined.
Certification & Labeling
-CEC 2005 BUILDING ENERGY EFFICIENCY STANDARDS
MINIMUM STANDARDS
Gla
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indow
s in
Build
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Ar
Em
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Punsala
n,
PG
BI,
25 N
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014
MINIMUM STANDARDS
Arc
ht E
C P
unsala
n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
-CEC 2005 BUILDING ENERGY EFFICIENCY STANDARDS
MINIMUM STANDARDS
Arc
ht E
C P
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n M
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5 G
reen B
uild
ing S
em
inar,
2012
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
MINIMUM STANDARDS
Arc
ht E
C P
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n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
MINIMUM STANDARDS
-2010 PSVARE STANDARD FOR ENERGY EFFICIENT BLDGS Arc
ht E
C P
unsala
n M
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5 G
reen B
uild
ing S
em
inar,
2012
G
lass W
indow
s in
Build
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nvelo
pe a
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nerg
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ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
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25 N
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30
Up to 55% More Efficient
Costs 6X more than BAU
OPPORTUNITIES
High Performing Windows
ISSUES
• Heat Conduction
• Solar Radiation
• Visual
Transmittance
BAU (2.5 - 3X inefficient
from ASHRAE 90.1) U-value 1.11
SHGC 0.86
Gla
ss W
indow
s in
Build
ing E
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pe a
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y E
ffic
iency –
Ar
Em
elit
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Punsala
n,
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BI,
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Comparative Analysis of Glass
Single Tinted Glazing Double Tinted Glazing
w/ Air Gap
-EFFICIENT WINDOWS COLLABORATIVE
OPPORTUNITIES
Gla
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indow
s in
Build
ing E
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Em
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Arc
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inar,
2012
Double Low E High
Solar Gain w/ Argon Fill
Double Low E Low Solar
Gain w/ Argon Fill
-EFFICIENT WINDOWS COLLABORATIVE
OPPORTUNITIES
Gla
ss W
indow
s in
Build
ing E
nvelo
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iency –
Ar
Em
elit
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Punsala
n,
PG
BI,
25 N
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Comparative Analysis of Glass
Determining Relative
Solar Heat Gain (RSHG)
Relative solar heat gain
(RSHG) is essentially the
same as SHGC, except
for the external shading
correction. It is calculated
by multiplying the SHGC
of the fenestration
product by an overhang
factor. If an overhang
does not exist, then the
overhang factor is 1.0.
-CEC 2005 BUILDING ENERGY EFFICIENCY STANDARDS
MINIMUM STANDARDS
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
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nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
MINIMUM STANDARDS
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
-2010 PSVARE STANDARD FOR ENERGY EFFICIENT BLDGS
Arc
ht E
C P
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2012
2010 PSVARE STANDARDS RECOMMENDATIONS
Window
Orientation
Maximu
m U
Value as
per 2010
PSVARE
Std
Maximum
SHGC as
per 2010
PSVARE
Std
Recommended Minimum
Performing Window
Assembly
Min.
Overhang
dimension
to meet
required
SHGC
Min.
Distance/
height
between
window
sill and
bottom of
overhang
NORTH
Facing
0.47 0.34 Double 6 mm thk
Reflective Clear Glass
with 6 mm wide air gap
and in aluminum frame
with thermal breaks and
insulated spacers
750 mm 1.2
meters
EAST Facing 0.47 0.25 Double 6 mm thk glass
Tinted and Reflective
Glass; or Double Low-E
Reflective glass. Both
with 12.5 mm wide air
gap and in aluminum
frame with thermal
breaks and insulated
spacers
1. to 1.5
meters
for Non
Low-E
1.0 to 1.5
meters for
Low-E
1.0 to
1.50
meters
SOUTH
Facing
0.47 0.25
WEST Facing 0.47 0.25
Gla
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Ar
Em
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Punsala
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Maximum Window Area
Under the envelope component approach, the total
window area may not exceed 40% of the gross wall area
(encompassing conditioned space) for the building.
Likewise, the west facing window area may not exceed
40% of the west gross wall area
MINIMUM STANDARDS
-2010 PSVARE STANDARD FOR ENERGY EFFICIENT BLDGS
Gla
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indow
s in
Build
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Ar
Em
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Punsala
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Skylight Prescriptive Requirements
1. Maximum area (total plus west facing).
2. Maximum U-factor.
3. Maximum solar heat gain coefficient.
MINIMUM STANDARDS
Arc
ht E
C P
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n M
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5 G
reen B
uild
ing S
em
inar,
2012
-2010 PSVARE STANDARD FOR ENERGY EFFICIENT BLDGS
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
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iency –
Ar
Em
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Skylight Area - The
area limit for skylights
is 5% of the gross
exterior roof area. The
limit increases to 10%
for buildings with an
atrium over 55 ft high
Skylight SHGC -
Skylights are regulated
only for SHGC, not
RSHG, because
skylights cannot have
overhangs.
MINIMUM STANDARDS
-2010 PSVARE STANDARD FOR ENERGY EFFICIENT BLDGS
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
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-2010 PSVARE STANDARD FOR ENERGY EFFICIENT BLDGS
Daylighting
Gla
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indow
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Ar
Em
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MINIMUM STANDARDS
Appropriately sized skylight systems when combined with daylighting controls can dramatically reduce the energy consumption of a building.
With too little skylight area, insufficient light is available
Too much skylight area, solar gains and heat losses through skylights negate the lighting savings with heating and cooling loads.
-CEC 2005 BUILDING ENERGY EFFICIENCY STANDARDS
MINIMUM STANDARDS
Arc
ht E
C P
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n M
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5 G
reen B
uild
ing S
em
inar,
2012
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
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ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
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Daylighting
Source: BNIM Architects & Lake Flato Architects Walking the Walk – by Anna Hoenmans High Performing Buildings ASHRAE, 2008 A
rcht E
C P
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n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
G
lass W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
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25 N
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014
Infiltration and Air Leakage
Joints and Openings
All joints and other openings in the building envelope
that are potential sources of air leakage must be
caulked, gasketed, weather-stripped, or otherwise
sealed to limit air leakage into or out of the building.
-CEC 2005 BUILDING ENERGY EFFICIENCY STANDARDS
MINIMUM STANDARDS
Arc
ht E
C P
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5 G
reen B
uild
ing S
em
inar,
2012
Gla
ss W
indow
s in
Build
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iency –
Ar
Em
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Punsala
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Manufactured
Site-built
Field-fabricated
Doors and windows must be
tested and shown to have
infiltration rates not
exceeding the values shown
Values shown as per NFRC
-CEC 2005 BUILDING ENERGY EFFICIENCY STANDARDS
MINIMUM STANDARDS
Arc
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C P
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uild
ing S
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inar,
2012
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
MINIMUM STANDARDS
Arc
ht E
C P
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n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
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014
Arc
ht E
C P
unsala
n –
Wate
r-T
ech P
hils
2012,
SM
X
Thermal Bridging
-THERMAL STUDY IN GLASS WINDOW ASSEMBLIES USING THERM 7
Gla
ss W
indow
s in
Build
ing E
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iency –
Ar
Em
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Punsala
n,
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014
OVERALL ENVELOPE
APPROACH & TDV
CALCULATION
Arc
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uild
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2012
Gla
ss W
indow
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Build
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iency –
Ar
Em
elit
o C
Punsala
n,
PG
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25 N
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014
Overall Envelope Approach
The overall envelope approach treats envelope components as a system and offers the ability to make
simple trade-offs between envelope components.
Overall Envelope TDV Energy Approach.
The total TDV Energy of the overall envelope of the proposed building, TDVprop, shall be no greater than the total TDV Energy of the overall envelope of a standard building, TDVstd,
MINIMUM STANDARDS
-2010 PSVARE STANDARD FOR ENERGY EFFICIENT BLDGS
Gla
ss W
indow
s in
Build
ing E
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Em
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Step 1 – Calculate Conduction
Heat Gain
OVERALL ENVELOPE APPROACH & TDV
CALCULATION
Step 2 – Calculate Radiation Heat Gain from
Opaque Surfaces
Step 3 – Calculate Heat Gain Thru
Fenestration & Skylights
Step 4 – Calculate the Total Heat Gain for
the Standard and Proposed Building
This is the sum of heat gains for each step
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
COMPLIANT! MANDATORY
MEASURES
PRESCRIPTIVE
MEASURES
OVERALL ENVELOPE
APPROACH
Windows, Doors, Roof,
Insulation, Skylight are
labeled and certified
Windows, Doors, Roof,
Insulation, Skylight, Walls
and Floors have to follow
prescribed requirements
Standard OTDV and
Proposed OTDV are
calculated and compared…
StdOTDV > =PropOTDV
O.K.!
OVERALL
PERFORMANCE
APPROACH
Use ENERGY EFFICIENCY
SIMULATION Softwares
OVERALL ENVELOPE APPROACH & TDV
CALCULATION
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Arc
ht E
C P
unsala
n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
Case Study 1
School Building in
Metro Manila
Thermal Comfort
Power Consumption
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Case Study 1
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Case Study 1
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Case Study 1
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Arc
ht E
C P
unsala
n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
Case Study 2
Proposed Showroom and
Service Center in Rizal Province
New Construction aiming for GREEEN Yakal or Molave Certification
Option 1 – Baseline (BAU)
Option 2 – Compliant (meets PSVARE Std Reqts on Bldg Envelope
Option 3 – Owner Reqts (maintain Single Glaze Clear Showrm windows
Option 4 – Alternative Approach (maintain Single Glaze Showrm window
but increase insulation in other areas)
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Case Study 2
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Arc
ht E
C P
unsala
n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
Case Study 2
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Daylighting
Arc
ht E
C P
unsala
n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
STRATEGIES
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Daylighting
Arc
ht E
C P
unsala
n M
odule
5 G
reen B
uild
ing S
em
inar,
2012
STRATEGIES
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Daylighting
STRATEGIES
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Daylighting
STRATEGIES
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
SUN’S PATH AT NORTH LATITUDE
Building Orientation
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
HORIZONTAL SUNBREAKS
-PASSIVE COOLING TECHNOLOGY FOR BUILDINGS IN HOT-HUMID CLIMATES
Shading Devices
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
VERTICAL SUNBREAKS
-PASSIVE COOLING TECHNOLOGY FOR BUILDINGS IN HOT-HUMID CLIMATES
Shading Devices
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Shading Devices
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Case Study 3
-SCREEN SHOT OF A DIALUX DAYLIGHTING SIMULATION OF A WAREHOUSE PROJ.
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Daylighting Simulation for a Warehouse, South of Manila
Case Study 3
Daylighting Simulation for a Warehouse, South of Manila
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
4-STOREY OFFICE BLDG – LIBIS, QC
2012
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Case Study 4
68
• Building Features
Insulated Building Envelope
High-performance Glass Windows
Max. 40% Total Window-to-Wall ratio (WWR)
VRF & Chilled Water cooling system
Fresh Air supply, Sealed Building Envelope
T8, T5, CFL, LED, Electronic Ballasts
Min. Lighting Power Density
Sewage Treatment Plant and Re-use
of wastewater for flushing and irrigation
Re-use of existing materials
Data based from PGBI Energy Modeling Studies for a 4-storey Office Bldg.
42% Energy Saving
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
21% Building
Envelope Efficiency
Case Study 4
CONCLUSION
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Reduced Energy Consumption & GHG emission
Building Envelope Standards & Best Practices
HVAC
Artificial Lighting
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
72
Green Buildings
Green Building
Code Standards
Business as Usual Lower end
Voluntary
Rating Systems LEED, BREEAM, BERDE, GREEEN
Num
ber
of
buildin
gs
Pro
filing E
xis
ting B
uildin
gs
for
Gre
en B
uildin
gs
in t
he P
Hilip
pin
es–
Em
elito
Punsa
lan,
ASH
RAE D
EC A
pr
25,
2014
Makati
Cit
y
73
BENCHMARKING PSVARE STANDARD
ASHRAE 90.1
Baseline Study
Market Study
Sensitivity Analysis BAU
~25%
~50%
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Factors to consider in the design of energy-efficient building envelopes
1. Set objectives with Client
2. Best to have an Integrated Design Team
3. Design the most energy-efficient building envelope. This will realize first-cost savings and energy-efficiency in the long term
4. Think of synergies or strategies
5. Refer to Prescriptive Requirements of Standards
6. Energy Modelling is a very power tool.
7. Need for Glazing Testing, Certification & Labelling.
8. Windows are just one of the components in the building envelope that can help attain energy efficiency.
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Resiliency?
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Back to Basics
Resiliency?
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
Back to Basics
END
Emelito Punsalan, Uap, EnP, GREEEN ADP+AA
United Architects of the Philippines
UAP- Green Architecture Movement
Philippine Green Building Initiative
ASHRAE, Philippines Chapter
LR Punsalan & Associates
+63 920 9626445
Gla
ss W
indow
s in
Build
ing E
nvelo
pe a
nd E
nerg
y E
ffic
iency –
Ar
Em
elit
o C
Punsala
n,
PG
BI,
25 N
ov 2
014
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