7 advantages of applying vacuum glass in curtain wall

China has been the world largest curtain wall production and application country,currently there’re over 1500 curtain wall manufacturers and annual output has already reached 100 million square meters.

In which over 90% curtain wall used insulated glass,especially typically 6 LE+12A+6 insulated glass,while vacuum glass,because of limited supplying capability and high price,rarely used in curtain wall projects,actually there’re 7 advantages using vacuum glass in curtain wall.

1.Extremely low thermal conductivity.

Below tables shows the typical glass combinations that used in curtain wall projects.

Glass combination	6 LE+12A+6C Single silver	6 LE+12A+6C Double silver	6 LE+12A+6C Triple silver	6 LE+12A+6LE+12A+6C Double silver	6LE+0.3V+6C
U value	1.80	1.64	1.60	0.65	0.47

Vacuum glass U factor is 25% that of double glass units,what does that mean?

For example a public project ,covering area 3693m2, construction area 56000sqm, and windows&facade total area 7980m2, there are 2 glass options:

6LE+12A+6C : U value 1.7W/M2.K.

6+0.3V+6 : U value 0.5W/M2.K.

Compared with insulated glass, Vacuum glass can save 7.14 Kwh/sqm annually and total 0.4 million Kwh,reduce CO2 emission 315MT .

House owners can cover the initial installation costs within 8 years,while in following 20 years, customers can always benefit from vacuum glass can continuously save energy costs.

2.Thin and light,save the facade weight.

Typical vacuum glass is only 8.3mm and 10.3mm,which is less than 50% that of insulated glass.

Compared with triple glazed units,especially glass used in airport,library etc which require thick glass to get better acoustic performance, VIG thickness is less than 25% that of triple glazing,this can not only decrease the overall glass overall weight, decrease the pressure of supporting systems.

Facade designers can not only use simple and thinner facade systems to decrease weight and costs,but also prolong the facade lifetime.

3.Thermal conductivity is not affected by installation angles.

In most projects,glass is installed vertically.With high performance silver low-E coating,the insulated glass on the vertical facade will decrease the solar energy transmitted the glass,and save air conditioner heating and cooling fees.While if the installation angles affect insulated glass U value because the angle affect inside glass convection.

In winter, U vaue is 50% higher when horizontally installed compared with vertically installed.

Architects are applying more structure types and quite different shaped glass panels, of course glass are not always vertically installed.

As there’s no air inside VIG,so the U value are absolutely steady,whether it’s horizontal or vertical.

4.VIG ensures facade flatness,avoid visual distortion.

When the air temperature inside insulated glass increases or decreases by 15 degrees, the volume of the air sealed will expand or contract by 5%.Meanwhile altitude also affect the air pressure and cause glass expansion or contraction if insulated glass production &installation area altitude over 610M.

Vacuum glass eliminate the air and keep 10-4 Pa high vacuum space, the gas absorbent inside also ensure this condition during VIG lifetime , in addition that VIG production require absolute flatness to sustain the pillar position ,so VIG can ensure the flatness of curtain wall.

As the vacuum space is only 0.3mm,the external force (wind load,live load ) can be easily transmitted to the vacuum glass inner piece,the VIG can be seen as monolithic glass,and when calculation its wind load resistance and bending strength.

More details: Vacuum glass helps your facade free of visual distortion

5.Vacuum glass create silent environment.

The glass soundproof performance is mainly decided by the square meter glass weight,when it comes to vacuum glass times,the concept has been changed.

Vacuum space stopped the sound transmit glass,eliminate the medium of sound transmission,sound can only been transmitted through glass edge and the micro pillars.which makes glass thickness not that important.

More importantly,as there’s 0.3mm vacuum space,which make the resonance frequency of 2 panels increased and has better performance when stopping low and medium frequency noise,including traffic noise,wind,engine,air conditioners,elevators etc,which are the most common noise people are facing in city.

Learn more:Vacuum insulating glass soundproof performance

6.Easy maintenance.

In people’s impression,vacuum glass has high spontaneous breakage ratio after installation which caused high costs once broken,especially for high rise buildings.

The reasons for high breaking ratio is caused by multi reasons:

In earlier times, all glass are sealed with glass powders,during edge sealing process,the glass edge will be anneal and strength decreased,which caused uneven glass strength.

Other areas,such as the evacuation holes,not only has higher compression,but also will become the main point of vacuum glass failure.

Vacuum glass produced by Haan has solved these problems,our glass has no evacuation holes,and the overall glass and steady and same strength because glass was sealed in low temperature.

The Haan Vacuum glass can be seen as normal tempered glass and no worries about glass strength,glass breakage,glass failure,just keep regular cleaning and maintenance is OK.

7.Super long lifetime.

Haan Vacuum glass lifetime reach over 25 years ,one time investment, 25 years warranty and worry free.

Haan has the world best vacuum glass production technology ,we’re sure the application of HaanGlas in facade will bring comfort,silence and worry free experience to your life.