Daylight Analysis & Glazing Selection: A Case Study

Natural lighting is an extremely important part of any building – simply because it is beneficial to both comfort and energy efficiency of an interior space. Having ideal natural lighting inside a building can reduce the dependency on artificial lighting and create a much more holistic environment for rest, relaxation and work.

Yet, enabling the perfect balance of natural light within a building is not merely a function of using a glazing which will reflect heat and filter light. It depends on quite many factors, including the building orientation, the appropriateness of light diffusers installed, and also the kind of façades and windows in place. Thus, architect and building owners must conduct a thorough daylight analysis of any building in order to suggest glass that minimises discomfort and maximises visibility. Only after analysing the results of such a study can one opt for retrofitting buildings with low-E glass or going for a new glazing with the ideal U-value and SHGC.

This is what we performed for a corporate building in Mumbai.


A corporate building in Mumbai required an optimum glazing solution to maximize its VLT (visible light transmission) requirement without overdesigning the building.


Going by the specifications of glass, one with the lowest U-value and SHGC would have been the right solution for the corporate building. Yet the solution was not so easy.

In order to determine the effect of various glazing variants on the building, a daylight analysis was performed. The two glazing variants simulated for the building were Clear Glass (VLT 78%) and high performance glass (VLT 21%). Both the glasses performed identically in terms of achieving the optimal lux levels. Clear Glass, in fact, caused glare in certain portions of the building.

As can be seen in Fig. 2, the first case is Clear Glass (VLT = 78%). The pink region shows the area which will have glare, and the grey region indicates sub-optimal lighting. The second case is high-performance glass (VLT = 21%). Here, we can see the reduction in glare area without reducing optimum lux level.

Thus, AIS recommended using high-performance glass in order to reduce cooling load without compromising on the lighting load.


From the study conducted, the following results were deduced:

  • The same fenestration behaves differently depending on the specific design.
  • It should not be assumed that products with low U-Value and SHGC are the best and universal solution.
  • For windows receiving a high amount of solar radiation, products with low SHGC would perform better. Hence, a glazing solution should be selected only after thoroughly analysing the building design.

As mentioned earlier, architects and glass manufacturers have to study various factors in building design before selecting the ideal glazing. An important factor is window orientation and area which allows ideal dispersion of daylight without causing glare or excess heat gain. It has been observed that south-facing windows let in the highest amount of daylight while north-facing windows let in diffused and reflected glare-free light. On the other hand, east- and west-facing windows let in direct sunlight, glare, and heat gain, which are difficult to manage. Thus, different glazing solutions are required for different orientations, especially in the kind of building mentioned in the case study.


Optimal Building Design & Glazing: A Case Study

It is the 21st century, and energy conservation and sustainability in architecture is surely gathering momentum. With one eye fixed ever so intently on the environment and the rising global temperatures, architects are turning to innovation and technology to turn the tables on myopic building design and combat energy inefficiency in our living and working spaces. This is where glass is proving to be their trusted accomplice.

So, when a prominent learning institute in Mumbai approached Asahi India Glass Ltd., the most comprehensive integrated glass company in India, to achieve high performance energy efficiency, we carried out a comprehensive and painstaking glazing and building design analysis to provide a satisfactory solution. Let’s find out how:


A learning institute in Mumbai wanted to optimize its building design without spending big on glazing solutions. This meant reducing the heat gain inside the building without compromising natural lighting.


Normally, we have observed that when it comes to glazing solutions providing high performance energy efficiency, architectural glass variants with a lower Solar Factor and lower U-Value are favoured. But to achieve the ideal balance between the building design and glazing feasibility, we had to come up with an optimum solution that offers best return on investment.

Therefore, first we conducted a study to understand the building design. Due to the architecture of the institute, the building’s direct and indirect heat gain had fallen down considerably. This can be explained by Fig. 1:

  • 4 Classrooms located on the north side received diffused light and no direct heat
  • 4 South-facing classrooms were provided with a shading device to prevent direct heat and glare
  • 4 Buffer zones, created by placing the service areas along the east façade and corridors along the west façade, prevented heat ingress in the offices
  • 4 Walls had good insulation properties to prevent long-wave radiations from entering into the building
  • 4 North light provided natural light to a portion of the building

These observations allowed us to fine tune our glazing solution. Ultimately, due to the optimal building design, we could choose a solution which did not have the best specifications (and therefore higher cost) but was a perfect match for the design.

In order to do so, a detailed building energy analysis and simulation was conducted with a huge portfolio of AIS products. Their performance parameters are compared in the table above. Then, we compared the energy saving percentage against cost payback period.

This study is depicted in the Fig 2. As one can see, Spring SGU (Solar Control product from the AIS Ecosense range) which has Solar Factor (SF) = 64%, Visual Light Transmission (VLT) = 65%, and U-Value = 5.4 w/ m2 k performed best out of all the glasses with 17% energy savings and 2 months’ payback period, when compared to base case Clear DGU (double glaze unit).


Thus, by understanding the relationship between building design and glazing type, we could suggest the client a glazing glass with an optimum Solar Factor and U-Value and higher VLT – thus enabling the institute to save on money and recover investment far quicker than imagined.


AIS Swytchglas in Offices: Bolstering Privacy & Productivity

An office space needs to have an energy that keeps you positive and your productivity up. Privacy is also a concern for many who feel that that a quiet, interrupted environment suits their working style. So, how can one inculcate elements of privacy in a commercial space like an office where airiness and ventilation are conducive for a positive environment?

The answer lies in installing smart glass solutions for your office. Glass has always been a popular addition to offices around the globe, often replacing walls and whiteboards in many spaces. The latest technology is focused on improving the functional aesthetics of the glass with energy-efficient and sound-proofing leading the pack. Another technological marvel is the invention of switchable glass that can transform from a transparent glass to an opaque one in a matter of seconds.

AIS Swytchglas is one such example. Made with polymer dispersed crystals (PDC), the glass can switch from transparent to translucent and vice-versa, at the press of a button. When the power supply associated with the glass is switched off, the crystals are randomly scattered, deeming the glass opaque and creating the desired private ambiance. When one “switches” the glass on, the current makes the crystals reorient themselves, making the glass transparent, inviting more light and providing spatial illusion to the surroundings.

Associated benefits with this glass are plenty, the biggest one being that it gives you your privacy without creating a claustrophobic environment. The transparent glass wall also creates the illusion of an increased space and imparts a contemporary vibe to the interiors. An ideal addition to conference rooms, private cabins or hall partitions, the glass can be turned off when private conversations or meetings need to be held, and turned on when one needs the interiors to be more illuminated.

Another function of this glass is doubling up as a rear projection screen for presentations or videos, the smooth surface justifying sharp clarity for projected visuals. This smart glass can also be an efficient window glass with the translucent to opaque window providing sufficient light, and thus eliminating the need for installing curtains or blinders on the window. Instant sunshine or instant shade can now be controlled with a remote.

The combination of such functionalities and clean aesthetics is a rarity in the world, making a switchable glass like Swytchglas extremely desirable for office spaces. This glass has made it easier to attune the aesthetics of the working environment as per personal preferences at any time or day.


AIS World of Glass: The Perfect App for Selecting right glass solutions, Door & Window Glass for your space

When it comes to choosing the right glass for your residential or commercial space, careful planning and selection plays an important role. While best quality becomes the supreme determinant, different factors are taken into consideration depending upon where you want the glass to be installed. Providing stylish, aesthetic and strong glasses since long, we have been a leading glass solutions company. To let you choose quality glass at the ease of your fingertips, AIS World of Glass is the perfect app designed specifically to meet the needs of smart buildings with the latest technology.

Here are some of the best features offered by the app which makes Asahi India Glass Ltd. one of the best glass manufacturers in India:-

1. Glass Solutions: – The app presents detailed sections related to different types of glasses. There are five sections in total consisting of privacy, acoustic, safety, energy efficient and aesthetic solutions for you to choose from. These categorizations help ease the process of glass selection depending upon your requirement considerably.

2. Doors and Windows solutions: – The two substrates- uPVC and wooden – offer complete doors and window glass solutions. This ensures perfect blend of style and safety with superior amalgamation of form and function. All you need to do is install the app on your phone to have the customized doors and windows you always desired, in no time.

3. Specialized application: – Depending upon the type of application, AIS offers unique and advanced glass solutions. This means that you can choose a specific glass depending upon where you need to install them. For example- once you search for staircase glass, the variety of best class options will pop up for you to choose from. Same goes for canopies, sky lights, swimming pool and other places as well. These solutions are sure to add an aesthetic appeal to your interiors without compromising on quality.

4. Special experience zones: – Just imagine watching the glass switch from transparent to translucent at a single click right in front of you. Sounds interesting, right? Well, this is what the AIS World of Glass lets you do. You can have a first-hand experience in the privacy and security glass solutions option available in the experience zones to choose the best glass which suits your taste.

5. Connect with us: – The app also features a Connect with Us option where you can send in your requirements and get the best options available in no time depending upon your requirements.

6. Our Videos:

Explore our solution videos for better understanding of our product range through this section of the app.


4 Precautions to Take With Your Car’s Side Windows

There are many different window glass types such as laminated and tempered glass which are used in automotive glass installations. While windshields, which represent the most important glass installation in a car, are made from laminated glass, side windows are constructed from tempered glass. Many people prioritise windshield maintenance and repair for their cars, but that doesn’t mean that they neglect the side windows.

Unlike annealed and laminated glass, good quality tempered glass, such as Temperlite-LT by AIS Glass, breaks away into tiny pebble-like pieces that are harmless and powdery in nature. This property ensures that the passengers and the drivers remain uninjured in case the side windows get shattered. While tempered glass does make the side windows strong and durable, there are many precautions you need to take in order to ensure that it does not get damaged beyond repair.

Here are four things to keep in mind so as to ensure safe working car glass windows:

  1. Do not delay repair

From time to time, it is important to inspect the condition of your car windows. This becomes extremely important in the aftermath of an accident which might have caused some damage to the structure of the car. Even if your windows have a small crack, a minor chip or a scratch, do not assume that it is harmless. These damages have a habit of exacerbating over time while also weakening the glass, thus putting you and other passengers in danger the next time an accident occurs. Therefore, always get the windows repaired quickly by the experts in your vicinity.


  1. Do not slam the car doors violently

Yes, slamming the car doors time and time again can lead to damaged side windows. One has to understand that these sudden closing of the doors with force generate vibrations inside the car. If they occur with high frequency, then there is a chance that some integral structural damage might occur to the window installation or the windows might loosen. It is best to be gentle and mannerly while shutting the car door.


  1. Do not use ammonia-based cleaning agents

It is important to know the right type of cleaning agents for your car windows. Ammonia-based agents are usually used in architectural glass inside homes and buildings, and can damage the tint of the car windows. Also, while cleaning car windows, use a clean cloth or microfiber towel so as to avoid leaving damaging streaks.


  1. Do not expose car windows to long periods of intense, direct sunlight

Long exposure to harsh heat and sunlight causes UV ray damage to car windows, thereby decreasing their lifespan and also affecting the structural integrity of your car. Always try to park your car in the shade, a garage or with a protective cover.


Windshield Auto Glass: Manufacturing & Benefits

We all the know the basic components of a car. Wheels, doors, door handles, headlights and tail lights are all permanent fixtures even on the most basic car model available in the market right now. However, the most underrated installation on any vehicle has to be the safety glass on the windshield. The windshield protects all the passengers from any kind of injury from any kind of external damage, which range from small dents caused by weathering or any kind of mishap or accident. The windshield has undergone a lot of development over the years, from the times it was cleaned by the driver himself to windshield wipers that can sense when it rains and automatically switch on.

Windshields, or auto glass have one of the most important functions of the car: save the passengers from any kind of bodily harm. But how does a material like glass become so strong so as to not damage anyone inside the car?

Auto Glass


Makings of a Windshield

Unlike side windows, which are made from toughened glass, the windshield is a very advanced form of laminated glass that has been perfected over the years to provide the best safety standards on a car. From the glue that keeps the layered glass together to the actual fitting of the windshield on the vehicle, the process is extensive and is very carefully conducted.

The glass formula of the windshield is firstly put through a float chamber. The raw materials in this chamber are heated to a point so that they melt and are fed onto a bath of molten tin where the glass is rested till it becomes flat. The glass is then formed and cut through a process called annealing and after it is put on a mould for the correct shape. It is then laminated by pressing it repeatedly through rollers to make it transparent and strong. This process helps in strengthening the glass, which itself has a lot of benefits. Laminated glass, technically, consists of two layers of strengthened glass sandwiched by a plastic interlayer, usually PVB (poly vinyl butyral) that acts as a buffer and a glue which holds on to the glass even after shattering.

Benefits of a Windshield Glass

There are a lot of advantages of the modern windshield, which include:

•It gives you ample protection from any kind of external factors that can affect you.
•It contributes to the overall structural integrity of the vehicle, working in tandem to keep the entire vehicle safe.
•It also helps in deploying air bags, because if the adhesive is put up properly, the airbags can discharge without any hitches.
•It also provides protection for not just the driver, but the passenger too, effectively reducing the number of injuries that can suffered in case anything goes wrong.


Green Buildings: Here’s why they are Environment Friendly

A wise man once said, “When the well is dry, we know the worth of water, and once we realize it, we shouldn’t wait to act.”

Act responsible, take a step toward sustainability and save mother earth.

Our planet today is facing innumerous difficulties. From population explosion to climatic changes, deforestation, fossil fuel depletion, ocean acidification, a loss of biodiversity and much more.

The growth and expansion of population is having a tremendous impact on our natural surroundings. The construction, structure and operation of the buildings we live and work are accountable for the consumption of our resources. Let’s take a look at how much do these buildings approximately account for?


Various Applications & Benefits of Sound Proof Glass


Indian architecture has evolved over time and glass has played an integral role in this evolution. This progress has helped to meet a variety of designs and structural needs. With the advancement of technology, various methods of glass production have been made possible. This has helped in the development of many innovative glass products.

Today, you are likely to find a variety of types of glass that are available in different designs, textures and styles. However, if you are looking for a customized glass solution for your home, office or commercial space, AIS glass manufacturers are reliable and trustworthy.

Types of AIS glass products:

AIS offer a wide range of glass solutions for the interiors and exteriors of your homes. Some of the solutions offered are laminated glass, annealed glass, frosted glass, float glass, clear glass and many more. Besides the above, AIS also offers specialized solar control glass solutions such as AIS SunShield, AIS Stronglas, AIS Ecosense and AIS Swytchglas. These are unique and suitable for a variety of applications.


Architectural & Car Glass Solutions Under One Roof By AIS

Asahi India Glass Limited (AIS), India’s leading integrated glass company, inaugurated a first-of-its-kind store in the Punjabi Bagh area in New Delhi. The Company has brought two of its signature expert service providers in glass, Windshield Experts and Glasxperts, together under one roof.

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Having carved a niche in giving expert solutions in glass, AIS wants to give its’ customers the convenience of a ‘one-stop solution’ for all their glass requirements, all in one place.