thermal performance of windows

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Copyright © LIXIL Corporation, All rights reserved.
＋
遮蔽物
（ブラインドなど）＋
６, August 2015
LIXIL Co.,Ltd.
ＨｉｒｏｙｕｋｉＩｓｈｉzuｍｉ
Evaluation about the window / glass
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Energy Efficiency Standards

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Energy loss from the building
Insulation performance and solar heat gain coefficient of
the window are important.
The ratio that the heat of the room
is lost by all parts outside in the
winter season
Heat capacity to invade from a window
Window Window
•thermal transmittance mainly ・solar heat gain coefficient mainly
ＵＡ value ηＡ value
Winter Summer
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little sunlight
much sunlight
cold
muggy
Found performance varies
according to an area
Japanese energy-saving standard
U
η
U
η

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the Japanese Industrial Standards
（Window and Door）
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About the Japanese Industrial Standards of the window about the
energy saving
・JIS A ４７０６
Windows
Standard of the product specification
This standard determines a level of the performance.
・JIS A ４７０２
Ｄｏｏｒ
This standard determines a level of the performance.

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About the Japanese Industrial Standards of the window about the
energy saving
・JIS A ２１０２
・JIS A ２１０３
・JIS A １４９３
・JIS A ４７１０
Thermal performance of windows and doors
calculation of thermal transmittance
It is based on the ISO 10077
calculation of solar heat gain coefficient
It is based on the ISO 15099
windows and door sets thermal resistance test
It is based on the ISO １２５６７－１
determination of solar heat gain coefficient
It is based on the ＮＥＷ ISO ＣＤ１９４６７
Standard of the evaluation method
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Window Performance
It is the basic performance of the window
It is performance of relief, the security
It is performance of the comfort
Ex. Thermal Performance Evaluation Method for Windows
Ex. It evaluate the crime prevention-related for the window

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This JIS ranks the performance of the window.（JIS A 4706）
Product standard of the window（１）
wind resistance
Water tightness
It is important at first to secure the basic
performance of the window.
wind resistance is ranked by a low
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Product standard of the window（２）
imparting an additional value.
・Energy saving characteristics
In Japan, the grade of insulation
efficiency is provided in JIS A 4706.

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Thermal Performance Evaluation Method for Windows
Appearance of test piece
(under irradiation)
Test
piece
Internal
20℃
External
0℃
JIS Thermal Insulation Performance Measurement
Method (JIS A 4710：2004)
SHGC Measurement Method (JIS A 1493)
JIS Thermal Insulation Performance Calculation
Method (JIS A 2102：2011)
Internal
20℃
External
0℃
Frame model
With solar radiation
Frame model
SHGC Calculation Method (JIS A 2103)
Solar Simulator
(Xenon Lamp + Filter)
Equivalent to ISO 15099
Environmental conditions
Internal
25℃
External
30℃
Solar heat
gain
Calculation method Measurement method
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Calculation Method Standards
and Calculation Software for Windows
Portion
window
Glass NFRC 100 (2010)
Normative std：ISO 15099 (2003)
JIS R 3107 (1998)
ISO 10292 (1994)
ISO 15099 (2003)
EN 673
NFRC 200 (2010)
Frame
Entire
window
JIS A2103：2014 ISO 15099 (2003)
Not available
(simplified calculation method
based on thermal barrier
performance of glass portion)
Glass NFRC 200 (2010)
JIS R 3106 (1998)
Normative std：ISO 9050(2003)
ISO 9050 (2003)
ISO 15099 (2003)
EN 410
EN 13363-1 (2003)
EN 13363-2 (2005)
NFRC 100 (2010)
JIS A 2102-1 (2011)
JIS A 2102-2 (2011)
ISO 10077-1 (2006)
ISO 10077-2 (2003)
ISO 15099 (2003)
EN ISO 10077-1
(2006)
EN ISO 10077-2
(2003)
Frame
THERM
(Lawrence Berkeley National
Laboratory)
TB2D/BEM
(Association of Living Amenity)
―
WinIso2D
(Sommer Informatik：Germany)
BISCO (PHYSIBEL：Belgium)
Calculationsoftware
Glass Optics (Lawrence Berkeley
National Laboratory) WindEye
(Association of Living Amenity)
WIS
(TNO：Netherlands)
Entire
window
WINDOW (Lawrence Berkeley
National Laboratory)
USA (NFRC1)) Japan (JIS) ISO StandardsEurope (EN)
1) NFRC: National Fenestration Rating Council
performa
nce
ThermalInsulation
PerformancestandardsSHGCstandards

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solar shading
It is the example of the shading device
SUNSHADE
Window shade in double glazing
Blind
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outside inside
transmittance
SHGC
reflectance
absorption absorption
Principle

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Examination of the test method
National Institute for Land and Infrastructure Management
It is studied the prototype from fifteen years ago
Completion of a device measuring a real window from November, 2004
Summary of the examination
device
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＋
遮蔽物
（ブラインドなど）＋
evaluation program of the window
Iｔ can add not only the window but also a door and a wall, a roof、the
function for the average of house.

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Summary of WindEye
WindEye is Window Thermal Performance Evaluation Tool.
Output : Thermal transmittance
Solar Heat Gain Coefficient （S.H.G.C） … etc
Operation is easy and anyone can treat it.
License is free.
Consists of the database ，examination and program.
The public institution is performing maintenance management and
inspection
Used to Thermal Performance Evaluation of Windows in Japan.
Updating the database enables WindEye to provide the users with
the latest data at all times.
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General Expression for Thermal Performance of Windows
Frame Glass Shading device
(Blind/ Screen)
Basic performance data Output
・Ｕf
・Ａf
・ηfr
・Ａfr
・Ｕgl
・Ａgl
・ηglr
・Ａglr
・τdir-S
・ρdir-S
・τdir-D
・ρdir-D
・ＵW
・ＡW
・ηW
WindEye DB
（WindEye has these basic performance data as database.）
・・・etc ・・・etc ・・・etc
Basic performance data Basic performance data
＋＋
Window
(with Shading device)
Window
（τ、ρ）

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Operation of WindEye
ALIA
Data
base
TB2D/BEM
WindEye
Association of Living Amenity
(ALIA)
Reviews the basic performance data Maintains
the product data. User
WindEye Development Team
Program maintenance
Up dating the database enables WindEye to provide the users
with the latest data at all times.
Manufacturers
Basic performance data
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The first screen
Feature
・Operation is easy and anyone can
treat it.
・License is free
・The public institution is performing
maintenance management and
inspection.
・Used to Thermal Performance
Evaluation of Windows in Japan
・ Calculation of 30 type windows
are possible all at once.
Features of WindEye
Selection of an initial condition

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Frame Information Input
WindEye: Selection of Window Types and Frames
Selection of frame
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Window Size
Input
・Width(mm)
・Height(mm)
Output：OK or NG
・OK (Existing size) ⇒ Calculation practice
・NG (Size not exist) ⇒Resetting of size
(Calculation practice is impossible.)
Calculation
button
Operation of WindEye
Selection of grass

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・Area of Window
・Thermal transmittance
・Solar Heat Gain Coefficient
(S.H.G.C)
・Ecology grade
Output
Output sample as a result of WindEye
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Output sample as a result of WindEye(PDF)
Size Information
Frame Information
Glass Information
Shading device
Information
Window
Information
Calculation result Conditions
Issue of a certificate

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Thank for your attention!

thermal performance of windows

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thermal performance of windows