Triple silver low-E insulating glass in LEED buildings

 The  the Leadership in Energy and Environmental Design (LEED) rating system has high requirement about the building overall comfort, functionality and energy savings.Many architects prefer using high performance triple silver low-E insulating glass on their buildings that meet LEED requirement,the main glass manufacturers worldwide already developed super products ,typically products include:

Vitro Solarban 60, Vitro Solarban 90.

Guardian Sunguard SNX 51/23, SNX62/27

AGC Confort Select 23,Confort Select 23

Cardinal Quad LoĒ-452+, LoĒ³-366

Pilkington Suncool 70/35 Pro T, 50/25 Pro T

SGG Cool Lite Xtreme 60/28

Beside these,China glass manufacturers also has similar products,for example：

Jinjing optecselec 70xl

CSG TT50, TT65

MORN MT58, MT70

TG PTE58, PTE75

SYP YTE52, YTE70

triple silver low-E coating-applied in USA

After checking these coated glass, all the triple silver low-E has light transmittance about 50% and 70%,and most popular&widely used in coating with 70% light transmittance,typically coated on low iron glass to achieve more clear appearance.

Triple silver low e coating is the newest and best glass coating of human beings and possible to be the last generation energy efficient glass coatings for its ultimate performance.

Triple-silver-low-e-performance-data

Features of triple silver low-E:

1. Low SHGC (Solar heat gain coefficient)

The LSG of single silver low e is around 1.4,while double silver one can be over 1.6-2,triple silver low e LSG can reach 2.2 or even more.

Which means that under the same light transmittance, triple one can reach lower SC value and transfer the lighting to cold light,allow much less solar radiation through the glass.

2. High light transmittance.

Light transmittance is kept 60-70% while keeping low SHGC,the coating can be applied in everywhere,both high altitude cold areas and low altitude hot areas.

triple silver insulating glass-glass facade project

3. Low Glass U value

Insulating glass with triple silver low-E has low thermal conductivity,typical U value for 6-12-6 is 1.6W/M2.K,in addition to more thermal insulation measurement, for example ,argon filing, warm edge spacer,triple glazed units,the glass U value reach 1.0W/m2.k or even less to prevent heat through the glass.

4. High processing difficulty.

Compared with traditional coating products,Triple silver low-E coating is made with 13 or even more layers,the extremely low thermal absorb make it difficult to be tempered.The glass is hard to be heating to the required tempering temperature and easy to cause glass flatness problem.

The coating also require very short processing time from unpacking to been made into insulating glass.

These shortage bring difficulty in production and it’s difficult to find a good triple silver low-E glass manufacturer in China.

triple silver low-E coated glass-solarban 70XL-CHINA

 

Why Leed projects select triple silver low-E insulating glass?

The main reasons for the insulating glass is its best thermal insulation performance.

Below chart shows the air conditioner investment for a 22000 sqm glass facade located in South China:

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Glass	LT %	SC	U value	Cooling load	AC Investment
6-12-6 Single Silver Low-E	67	0.65	1.96	2250.72KW	USD1,380,000
6-12-6 Double Silver Low-E	69	0.49	1.65	912.51KW	USD560,000
6-12-6 Triple Silver Low-E	67	0.38	1.65	525.93KW	USD323,000

With the same light transmittance,the A/C cooling load of triple silver low-E insulating glass is only 23% of single silver low-e, and unit decreased cooling investment is USD49/SQM.

Compared with double silver low-E,the decreased cooling investment is USD 11/SQM.

More comparison：Difference between Single silver low-E,double silver low e and triple silver low e

Even though the initial glass investment is higher,but the saved heating and cooling costs is much more than the glass price difference.

Typically projects that we have been involved in:

1. Singapore: Sandbay Marine- 5000sqm.

Solarban 70XL HS + 12A + 8mm Clear float FT with HST

8mm PPG Solarban 70XL HS + 12A + 8mm Clear Float FT with HST

Singarepore Sand bay Marine-glass facade

2. Australia:Australian Rugby Development Centre -6000sqm

6mm MT58 on clear HS (#2)+12A+10mm Clear HS

6mm MT58 on clear HS & digital printer white frit(#2)+12A+10mm  Clear HS

Australian Rugby Development Centre

3. Australia  Opal Tower, Sydney -22000sqm.

6mm Triple silver Low-E MT70 on clear HS +12A+6mm clear HS

Opal Tower, Sydney-TRIPLS ISLVER LOW E GLASS

More and more projects worldwide select to use our triple silver low-E projects,our advanced glass coating lines enable us to produce world class glass coatings , Tamglass tempering furnace,Lisec& Bystronic insulating lines support us to produce the best quality insulated glass with far more less costs than other glass processors,contact us now for your next great LEED building,Morn is your best China triple silver low-E manufacturer.

LOW E GLASS PRODUCTION

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Ultraviolet blocking function of low-E coating

 Ultraviolet was discovered in the early 19th century and generally refers to light radiation with a wavelength of 100 nm to 380 nm. Ultraviolet radiation is a double-edged sword to human life. UV protect people but too much UV will be harmful.

 Low-E glass is more and more widely used, but people are more concerned about the blocking effect of Low-E glass on infrared radiation, and seldom care about its block function of ultraviolet rays. This article introduces the effects and effects of ultraviolet rays on the human body and objects, discusses the attenuation of Low-E glass to ultraviolet rays, and gives suggestions.

solar energy -Ultraviolet

The function &influence of Ultraviolet

1. 
   

   The influence on human body

Appropriate amount of ultraviolet rays are helpful to human body, it can promote the production of vitamin D. and promote the absorption of calcium.However,if the human body is exposed to excessive ultraviolet rays,a series of changes in the body, causing damage to the eyes, skin, immune system, etc.

UV effect on human body

2. 
   

   The influence on bamboo and wood

The main components of bamboo and wood materials such as cellulose and hemicellulose absorb ultraviolet rays to a certain extent. After absorption, the molecular structure will be damaged, and its physical and chemical properties will also be seriously affected, which ultimately affects the stability,Performance, durability, aesthetics of bamboo and wood materials.

long time sunlight cause furniture fading

3. 
   

   The influence on Polymer Materials

Polymer materials include plastics, rubber, fibers, films, adhesives and coatings, etc., which are widely used in indoor furniture and installations. When polymer materials are irradiated with light, the molecular chain of the material is broken, the physical and mechanical properties are deteriorated, and the chemical structure is changed, thereby partially losing or losing its use value, and appearing hard, sticky, brittle, discolored, and losing strength.

Resin roof color fading

The UV blocking effect of normal insulated glass

The GlassSpec2500 building glass spectrophotometer is used to measure the ultraviolet transmission of common glass. The measuring wavelength range of this instrument is 300nm～2500nm. It can directly measure the ultraviolet transmittance of insulated glass without destroying the glass structure.

GlassSpec2500 Spectrophotometer

Before the test we must be clear that UVC comes from manual lighting,other UV brands-UVA (wavelength 315-380nm) and UVB (wavelength 280-315nm) can penetrate the glass,Below is the test result:insulated glass (6+12A+6)  made with clear glass can block 52.56% UV,clear glass can block 100% UVB (wavelength 280nm-315nm) and low iron insulated glass block 24.48% UV,but allows 28% UVB transmission.

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Glass type	Glass structure	UV transmittance %	UVA transmittance	UVB transmittance
Clear Insulated glass	6+12A+6	47.44%	48.78%	0%
Low iron insulated glass	6+12A+6	75.52%	76.86%	28.13%

The UV blocking effect of low e insulated glass

Below table shows the UV transmission of single silver low-E,double silver low-E and triple silver low-E.

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Glass type	Glass structure	UV transmittance %	UVA transmittance	UVB transmittance
Single silver lowe	6 low-e+12A+6	32.38%	33.29%	0%
Double silver lowe	6 low-e+12A+6	15.11%	15.53%	0%
Triple silver lowe	6 low-e+12A+6	8.43%	8.67%	0%

Conclusion:

The ultraviolet rays blocking effected is sorted from strong to weak: triple silver low e IGU> double silver low E IGU> single silverLow e IGU> clear insulated glass > low iron insulated glass.Low-E insulating glass can block more ultraviolet rays and reduce the incidence of ultraviolet rays into the room.

UV transmittance of different insulated glass

In practical applications, we can change the transmittance of the Low-E film in various bands by changing the thickness of the Low-E coating to further affect the UV transmittance. The thicker the Low-E film, the stronger block effect.

Is it necessary to consider the UV blocking of Low-E glass ?

In the current scientific cognition, UVA has not yet found its direct benefit to the human body, that is, no matter how much Low-E glass attenuates ultraviolet rays, the human body cannot benefit from the ultraviolet radiation passing through the glass.

The short-wave part of UVB also has a sterilization effect,but only low iron glass allows UVB transmittance, clear glass blocked 100% UVB.

No matter how much the UV transmittance ,the UV transmitted through Low-E insulated glass don’t play the role of disinfection and sterilization.

Soaking up the sun in front of indoor glass windows is far less effective than outdoors.

outdoor sunlight

When indoor bamboo and wood materials and polymer materials (plastics, paints, etc.) are used frequently, attention should be paid to the attenuation of ultraviolet rays when choosing Low-E glass, and the ultraviolet rays entering the room should be minimized.

For museums and libraries, in order to reduce the impact of ultraviolet rays on cultural relics, books, calligraphy, etc., it is necessary to consider the attenuation of Low-E glass to ultraviolet rays,in this case,laminated insulated glass will be perfect which can not only block 100% UV but also offering good thermal insulation performance.

Library should avoid UV rays transmission

Morn is your turnkey insulated glass manufacturer and supplier in China,we offer high UV blocking insulated glass,especially triple silver low-E insulating glass with high performance,welcome contact us if you got any projects require UV block glass.

Download this article here:Ultraviolet block function of low-E coating