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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.

CHALLENGE

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

SOLUTION

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.

RESULTS

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.

Categories

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

Categories

4 Types of uPVC Window Designs to Give Your Home an Enticing Look

The trend of using uPVC material in doors and windows has been on the rise, all thanks to the plethora of benefits it offers. uPVC material showcases a perfect blend of modernity and advanced features. It is a tough and durable material which is rot, heat and noise-resistant. It doesn’t require any high maintenance and can be easily cleaned using water and detergent. uPVC doors and windows have a huge success rate as apart from being durable and long lasting, they are reinforced with galvanized steel which makes them withstand adverse conditions easily.
The wonderful thing about uPVC is that it can be customized to suit a wide variety of window shapes and designs. If you want to impart your house that ethereal and awe-inspiring bespoke look, then selecting the right type of windows is critical.

Here are 4 types of uPVC window designs you can consider for the same:
Sliding Windows: –
Sliding windows are horizontal opening windows which provide great cross-ventilation and lighting options. They are easy to operate and provide unobstructed view of the outside world. They are also energy efficient, since they effectively block airflow from inside to outside and vice versa. Sliding windows aid in saving space too as they don’t occupy vertical space as in the case of normal windows. Your room will automatically appear larger if you choose them for your house.
French Windows :-
One sure shot advantage of French windows is ample lighting in your room. French windows usually have a frame that features window glass running through its entire length. Apart from lighting, they also make your house look spacious. They are most suitable for outer walls since they provide magnificent view of the outside lawns, gardens, pool or patio. They can be decorated with deluxe curtains and blinds to give your home a luxurious look.
Casement Windows :-
Casement windows are vertical opening windows fixed with side mounted hinges. They are one of the most widely preferred window designs. They can be opened widely and provide better ventilation as compared to fixed windows. Casement windows also provide high security since they are very difficult to break and their hook shaped locks are embedded within the frame making them untouchable from outside.
Two Sash Windows :-
These are made up of movable panels known as sashes. Two sash windows have been in use since ages and still continue to be one of the most popular choices especially in traditional homes. It offers a perfect blend of utility and attractiveness .It provides double ventilation benefit as when both the sashes are opened, it provides a way for fresh, cool air to come inside while letting the warm air to exit the room from top.

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Use of glass in hospitality industry

Noise pollution is detrimental to health. It can cause psychological and physiological damage to a person. As a result, noise becomes hostile and can make your environment unpleasant.  By using the right glass, architects can decrease the amount of unwanted noise and make your surroundings pleasant. One such important commercial segment where noise pollution needs to be kept at bay is the hospitality industry. Besides noise pollution, high energy bills and excessive light are other major problems faced by players in the restaurant and hotel sector. As the industry focusses on the comfort of their guests, such issues need to be resolved effectively.
 
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Why use glass?
Installing glass doors and windows can help create audacious designs and aesthetic environments. If privacy is what you are looking for, make sure you use frosted glass. Acoustic insulation glazing can be used to cancel the noise and create that tranquil setting you desire.  Glass has added benefits such as durability and high performance, and will assist in creating an aesthetic appearance. Therefore, architects who are working on a project should explore the option of using glass as it is a highly versatile building material.
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Types of glass
In this competitive market, hoteliers often find it challenging to provide customers with the very best. The noise, poor glazing, and many other issues result in unsatisfactory conditions for guests. By making use of architectural, float, or annealed glass, you can create the right conditions for guests and make rooms look appealing, too. Architects are guaranteed to impress their clients / customers with these aesthetic layout designs that can keep the decibel levels
very low.
Take a look at our noise proof glass and energy-efficient solutions listed below:
Aesthetic: AIS Aesthetic glass in hotels not only gives an appealing look to the interiors, but it also adds a touch of modernity. Using attractive glass also enhances the beauty of the interiors.
Sound Insulation: The interlayers of AIS Acousticglas can reduce any kind of external sound. It is multifunctional and offers high-performance benefits. This glass can also be useful to preserve the aesthetic appearance of a structure. Besides reduction of noise pollution, there are many other options that provide an array of energy-saving solutions. Such solutions can be useful to reduce the energy consumption drastically.
Security: It is the perfect solution for contemporary living spaces. AIS Securityglas can provide level-2 and level-3 protection from burglar attacks. With such solutions architects can ensure that a building’s aesthetics are satisfactorily addressed, while taking care that occupants’ safety and security aspects are not compromised.
Privacy: The latest AIS Swytchglas is designed with modern technology that will help you maintain your privacy at just the click of a button. This unique glass technology enables the transformation of transparent glass to opaque glass with just the flick of a switch.
Energy Efficiency: With AIS Ecosense glass, one can achieve that subtle balance between the environment inside and outside the structure. Getting optimum daylight and energy efficiency in every sense is achieved by using this glass.
This green-standard glass is available in a variety of shades. They are classified further into three categories, as follows:

  • Enhance (Solar Control)
  • Exceed (Solar Control Low E0)
  • Essence (Low E) and Edge (Solar Control & Low E)

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With these glass solutions, building the world closer to nature is easier. The glass can be useful to improve efficiency, aesthetics, and eco-sensitivity.
Hotels and restaurants built in certain parts of India require thermal insulation and better light transmission. These glass solutions can adequately meet such requirements. With the availability of this glass in different shades, implementing energy-efficient and aesthetic building designs has now become possible.